Papers - SAKAI Kentaro
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Actual Status of Research Equipment Usage Inside and Outside the University and Analysis of Research Papers Published by on-Campus Use of Research Equipment at the University of Miyazaki Reviewed
SAKAI Kentaro, TANAKA Hidenori
The Journal of Science Policy and Research Management 39 ( 1 ) 26 - 34 2024.5
Authorship:Lead author, Corresponding author Language:Japanese Publishing type:Research paper (scientific journal) Publisher:Japan Society for Research Policy and Innovation Management
In order to improve research capabilities of Japan, it is necessary to strategically maintain, operate, and share research facilities and equipment based on university management strategies. In this situation, it is important to establish institutional research (IR) of research infrastructure that quantitatively analyzes and evaluates how the use of research equipment contributes to the research capabilities of universities, but this is still in the development stage. Therefore, it is necessary to improve its functions and establish a methodology. In this paper, we report the usage of research equipment inside and outside the university obtained from the equipment management system developed at the University of Miyazaki, and analyze the research fields, analysis contents, and regional characteristics of analysis request commissioned from outside the university. Moreover, we will analyze the number and quality of papers published through the use of research facilities, and describe an example of research infrastructure IR at our university, which is a local/regional university.
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Development of Borehole Seismometer Using Conical Pendulum to Three-Component Velocity Measurement Reviewed
Yoshimatsu Akito, Bonkobara Yasuhiro, Ueoka Nobo, Hamahata Takayuki, Sakai Kentaro, Nakano Atsushi, Terazono Shinichi
Memoirs of Faculty of Engineering, University of Miyazaki 52 65 - 69 2023.10
Language:Japanese Publishing type:Research paper (scientific journal)
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Dopant-induced photodegradation of organic water pollutants using cobalt oxide nanostructures of low cytotoxicity Reviewed International coauthorship
Ranjitha R., Dileep Kumar V.G., Navada M.K., Shetty S.M., Jayanna B.K., Bhatt A.S., Santosh M.S., Madhyastha H., Sakai K., Ravikumar C.R.
Journal of Environmental Chemical Engineering 11 ( 2 ) 2023.4
Language:English Publishing type:Research paper (scientific journal) Publisher:Journal of Environmental Chemical Engineering
Metal oxides are the simplest and most approachable solutions for attaining multifunctional properties applicable to modern-day technology. With growing concern over environmental conservation, an evaluation of the cytotoxicity of the metal oxides becomes necessary. The present work focuses on the photocatalytic and cytocompatibility behavior of Co3O4 nanomaterial. It has been observed that the addition of Li to the Co3O4 nanostructure generates a positive impact on the photodegradation of cationic dyes under UV light. The photocatalyst with 1 wt% Li-doped Co3O4 was found to be the most competent among the synthesized samples. Further, the sample has been employed for photocatalytic removal of the hazardous pollutant, pyrocatechol (PyC), in the presence of visible light. A photocatalytic efficiency of 84.5% (after 9 h) and high stability (86% after 5 cycles) is observed. A noteworthy revelation is the lower toxicity observed for Li-doped samples when compared to the pristine Co3O4. The (3-(4,5-dimethylthiazolyl-2)− 2,5-diphenyltetrazolium bromide) (MTT) assay carried out on mouse skin fibroblast cell lines reveals cytotoxicity inhibition by the doped nanostructures for up to 10 μg mL−1 concentration and excellent cell proliferation up to 24 h. The superior catalytic behavior and non-toxic nature of the Li-doped Co3O4 nanostructures provide ample opportunity for their integration into water remediation and effluent treatment systems.
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Fine Particle Adsorption Capacity of Volcanic Soil from Southern Kyushu, Japan Reviewed
Naoaki Misawa, Kentaro Yasui, Kentaro Sakai, Taichi Kobayashi, Hideki Nagahama, Tomohiro Haraguchi, Satomi Sasaki, Vetchapitak Torrung, Taradon Luangtongkum, Takako Taniguchi, Kentaro Yamada, Makoto Minamimagari, Toshihiro Usami, Hiroyuki Kinoshita
Nanomaterials 13 ( 3 ) 568-1 - 568-19 2023.1
Language:English Publishing type:Research paper (scientific journal) Publisher:Nanomaterials
“Akahoya” is a volcanic soil classified as a special soil deposited in Kyushu, Japan. Many of its properties are not yet clearly understood. We found that Akahoya had the potential to adsorb bacteria in cattle feces, which prompted us to investigate its material properties and perform experiments to comprehensively evaluate its adsorption performance for various fine particles such as acidic and basic dyes, NOx/SOx gas, and phosphoric acid ions, in addition to bacteria. Akahoya had a very high specific surface area owing to the large number of nanometer-sized pores in its structure; it exhibited a high adsorption capacity for both NO2 and SO2. Regarding the zeta potential of Akahoya, the point of zero charge was approximately pH 7.0. The surface potential had a significant effect on the adsorption of acidic and basic dyes. Akahoya had a very high cation exchange capacity when the sample surface was negatively charged and a high anion exchange capacity when the sample surface was positively charged. Akahoya also exhibited a relatively high adsorption capacity for phosphoric acid because of its high level of Al2O3, and the immersion liquid had a very high Al ion concentration. Finally, filtration tests were performed on Escherichia coli suspension using a column filled with Akahoya or another volcanic soil sample. The results confirmed that the Escherichia coli adhered on the Akahoya sample. The results of the Escherichia coli release test, after the filtration test, suggested that this adhesion to Akahoya could be phosphorus-mediated.
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Dual antibacterial and anti-inflammatory efficacy of a chitosan-chondroitin sulfate-based in-situ forming wound dressing. Reviewed International coauthorship
Sharma S, Madhyastha H, Kirwale SS, Sakai K, Katakia YT, Majumder S, Roy A
Carbohydrate polymers 298 120126 2022.12
Language:English Publishing type:Research paper (scientific journal) Publisher:Carbohydrate Polymers
None of the currently available wound dressings exhibit combined antibacterial and anti-inflammatory activity. Using polyelectrolyte complexation (PEC) between a cationic polysaccharide chitosan (CH) and an anionic glycosaminoglycan chondroitin sulfate (CS), we have developed a unique in-situ forming scaffold (CH-CS PEC), which develops at the wound site itself to influence the function of the wound bed cells. The current study demonstrated that CH-CS PEC could induce bacterial cell death through membrane pore formation and increased ROS production. Moreover, possibly due to its unique material properties including medium-soft viscoelasticity, porosity, and surface composition, CH-CS PEC could modulate macrophage function, increasing their phagocytic ability with low TNF-α and high IL-10 production. Faster wound closure and decreased CFU count was observed in an in-vivo infected wound model, with reduced NF-κB and increased VE-cadherin expression, indicating reduced inflammation and enhanced angiogenesis. In summary, this study exhibited that CH-CS PEC has substantial antibacterial and immunomodulatory properties.
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Dural Changes Induced by an Ultrasonic Bone Curette in an Excised Porcine Spinal Cord Reviewed
Ota Rizou, Iwaki Eri, Sakai Kentaro, Haraguchi Tomohiro, Kaneko Yasuyuki, Sekiguchi Satoshi, Yamaguchi Ryoji, Naganobu Kiyokazu
Veterinary Sciences 9 ( 11 ) 601-1 - 601-11 2022.10
Language:English Publishing type:Research paper (scientific journal)
In spinal surgery, ultrasonic bone curettes are considered unlikely to cause mechanical injury to the dura; however, there is little evidence to support this claim. We investigated the effect of direct contact with an ultrasonic bone curette on the dura and the protective effect of covering the dura with a cotton pattie using an excised porcine spinal cord. The ultrasonic bone curette was pressed against the porcine spinal cord with constant force and activated for 1 s, with or without covering the dura with a cotton pattie. The dural surface and cross-section were observed using electron and light microscopy. When the ultrasonic bone curette was applied directly against the dura, most specimens showed non-perforating dural injuries. However, none of the specimens showed dural perforation. Histological changes were also observed. The use of a cotton pattie reduced the occurrence of these changes, although it did not prevent them when ultrasonic vibration was applied with a large force. We considered ultrasonic bone curettes to have a low risk of dural perforation and, thus, to be a safe surgical device as long as they did not accidentally make strong contact with the dura.
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Designer exosomes: Smart nano-communication tools for translational medicine Reviewed International coauthorship
Harishkumar M., Radha M., Yuichi N., Muthukalianan G.K., Kaoru O., Shiomori K., Sakai K., Nozomi W.
Bioengineering 8 ( 11 ) 2021.11
Language:English Publishing type:Research paper (scientific journal) Publisher:Bioengineering
Exosomes are the master transporters of genes, RNAs, microRNAs, proteins, and lipids. They have applications in major diseases, including cancer, cardiovascular diseases, neurological disorders, and diabetes mellitus. Delivery of the exosomes to recipient cells is governed by the functional heterogenicity of the tissues. Engineered exosomes are promising tools in tissue regeneration. In addition to their role as intracellular communication cargos, exosomes are increasingly primed as standard biomarkers in the progression of diseases, thereby solving the diagnostic dilemma. Futuris-tic empowerment of exosomes with OMICS strategy can undoubtedly be a bio-tool in translational medicine. This review discusses the advent transformation of exosomes in regenerative medicine and limitations that are caveats to broader applications in clinical use.
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Sr Composition Dependence of the Trap Level in Strontium Aluminate Prepared by Combustion Synthesis Reviewed
Kodama Naoya, Yokoyama Hirosumi, Sakai Kentaro, Masumoto Yuta
Memoirs of Faculty of Engineering, University of Miyazaki 50 55 - 58 2021.9
Language:Japanese Publishing type:Research paper (scientific journal)
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Nagaoka A., Ota Y., Sakai K., Araki K., Matsuo H., Kadota N., Maeda K., Nakajima A., Nishioka K.
Renewable Energy 174 147 - 156 2021.8
Language:English Publishing type:Research paper (scientific journal) Publisher:Renewable Energy
The concept of zero-energy building (ZEB) has attracted global attention in recent years as it involves offsetting the primary energy usage of a building on an annual base by the energy generated from renewable resources. The performance of wall-mounted photovoltaics (PV) for building applications has great potential for ZEB. In this study, we compared wall-mounted and common roof-mounted PV systems using a combination of experimental and theoretical studies. The wall-mounted PV system exhibited an unusual performance behavior depending on the season. Winter is a suitable season for energy production from the wall-mounted PV system because of the low solar altitude and resulting lower incident angle of the sun. However, the performance ratio (PR) had twin peaks throughout the day that could not be explained by the classical model that uses irradiance and temperature variation. In summer, there was less irradiance on the vertical wall and the PR had triple peaks that were also hard to explain using the conventional model. We established a detailed output power model of the wall-mounted PV using spectrum variation on a vertical plane. Our approach is the development of spectrum model that can be applied to all-climate and computed the performance variation according to the sun's orientation and incident angle. Our model quantitatively explains unique seasonal and daily efficiency variations for the wall-mounted PV system (twin peaks in winter and triple peaks in summer). Our validated model can be utilized to map a suitable location for a wall-mounted PV system.
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Evaluation of rate of adhesion of Lactobacillus namurensis strain GYP-74 to porous fine ceramics Reviewed
Taoka Y., Sakai K., Kinoshita H., Fukuyama H., Kobayashi T., Hirano A., Kuroki N., Kuroki M., Kimura A.
Processes 9 ( 4 ) 2021.4
Language:English Publishing type:Research paper (scientific journal) Publisher:Processes
This study aimed to evaluate the ratio of adherence of lactic acid bacteria (LAB) to porous fine ceramics in order to develop a novel LAB-rich pickle container for the production of functional fermented vegetables. Some LAB were isolated from the salted rice bran used for pickling (Nukadoko in Japanese). These isolates were classified in Lactobacillus namurensis by phylogenetic analysis. Some pottery-shard (PS) samples were prepared by varying the mixing rate of polyacetal (POM) resin to clay (0-30% (v/v)) and the burning temperature (1000 °C or 1100 °C). A test of the adherence of strain GYP-74 to the PSs was performed. The results showed that the adherence rate was significantly higher in the PSs burned at 1100 °C as compared with those burned at 1000 °C. A pore distribution analysis showed that pore sizes of less than a few µm and pore sizes in the range of a few µm to a few hundred µm were mainly distributed in the PSs without and with POM, respectively. X-ray diffraction analysis showed that both PSs with and without POM contained quartz and hematite. The PSs burned at 1000 °C and 1100 °C specifically contained microcline and mullite, respectively. This study revealed the basal information regarding what makes PSs adequate for LAB adhesion.
DOI: 10.3390/pr9040658
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Rapid photocatalytic degradation of cationic organic dyes using Li-doped Ni/NiO nanocomposites and their electrochemical performance Reviewed International coauthorship
R. Ranjitha, K. N. Meghana, V. G. Dileep Kumar, Aarti S. Bhatt, B. K. Jayanna, C. R. Ravikumar, Mysore Sridhar Santosh, H. Madhyastha, K. Sakai
New Journal of Chemistry 45 ( 2 ) 796 - 809 2020.12
Language:English Publishing type:Research paper (scientific journal) Publisher:New Journal of Chemistry
Metal/metal oxide nanocomposites (NCs) have been attracting significant attention in recent times because of their applications in the fields of energy and environment. In the present work, we investigate the photocatalytic and electrochemical performances of Ni/NiO NCs synthesized by a facile and cost-effective reduction method using lithium salt as the dopant. Lithium influences the size, morphology and structural constitution of the final product. A variation in the lithium percentage was seen to have a direct effect on the Ni content. The structural conformation of the samples has been analyzed by XRD and further confirmed by XPS. A low optical energy bandgap (∼3.7 eV) and a mesoporous structure of the as-prepared samples were seen to play a crucial role in achieving the photocatalytic degradation of the cationic organic dyes concomitant to its electrochemical activity. On illumination with UV light, the Li-doped Ni/NiO NCs demonstrated rapid degradation of crystal violet and methyl violet 2B dyes. The synergism arising due to the substitutional doping of lithium and the presence of metallic nickel leads to efficient photodegradation of the dye pollutants by the catalysts. Further, the Li-doped Ni/NiO NCs displayed a better electrochemical performance than the undoped samples. The NC with 1 wt% Li exhibited the best values of specific capacitance (276.2 F g-1 at 5 A g-1) with an excellent cycling ability (<1% capacitance loss after 2000 cycles). The enhanced electrochemical and photocatalytic results suggest the dual activity of these nanocomposites in energy storage and water treatment applications. This journal is
DOI: 10.1039/D0NJ05268J
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Biosynthesis and characterization of nano magnetic hydroxyapatite(nMHAp): An accelerated approach using simulated body fluid for biomedical applications Reviewed International coauthorship
Akshay Bhatt, Kentaro Sakai, Radha Madhyastha, Masugi Murayama, Harishkumar Madhyastha, Subha Narayan Rath
Ceramics International 46 ( 17 ) 27866 - 27876 2020.12
Language:English Publishing type:Research paper (scientific journal) Publisher:Ceramics International
There are several metal ions including iron oxide nanoparticles, which has been used for doping hydroxyapatite to overcome the existing shortcoming associated with poor mechanical strength, less bioactivity and inert properties. Iron oxide nanoparticles, commonly known as magnetite, has shown a great potential in tissue engineering and various other biomedical applications. It has been proven that small quantity of iron increases the mechanical properties as well antioxidative property of the material. Magnetic hydroxyapatite is synthesized by many different synthesis routes such as hydrothermal, spray drying, ultrasonic irradiation etc. These synthesis routes are time consuming and requires sophisticated process parameters. Hence, to overcome these complexities, this study aims to synthesize and characterize nano magnetic hydroxyapatite (nMHAp) in a shorter duration than the conventionally used duration (over 24 h) through a novel bio-mimetic approach. The physicochemical properties were checked using XRD, FTIR, TGA, XPS, DLS, SEM, TEM and VSM. The results suggest that synthesized nMHAp contains magnetic properties and resembles carbonated apatite with the traces of Na, Mg, K, Cl and Fe. SEM and TEM analysis confirmed the spherical nature of nMHAp with average size between 10 and 200 nm. The optimized average time for nMHAp synthesis was found to be 3 h. Cellular biocompatibility and the measurement of reactive oxygen species using L929 cells confirmed the biocompatible and antioxidative nature of nMHAp. Hence, Our studies show that the nMHAp can be synthesized biomimetically in 3 h and potentially could be used for bone tissue engineering and other biomedical applications.
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c-Phycocyanin primed silver nano conjugates: Studies on red blood cell stress resilience mechanism Reviewed
Madhyastha H, Madhyastha R, Thakur A, Kentaro S, Dev A, Singh S, Chandrashekharappa R B, Kumar H, Acevedo O, Nakajima Y, Daima HK, Aradhya A, Nagaraj P N, Maruyama M
Colloids and surfaces. B, Biointerfaces 194 111211 2020.10
Language:Japanese Publishing type:Research paper (scientific journal)
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Kodama Naoya, Matsumoto Kazuma, Yokoyama Hirosumi, Sakai Kentaro
Memoirs of Faculty of Engineering, University of Miyazaki 49 61 - 64 2020.9
Language:Japanese Publishing type:Research paper (scientific journal)
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Matsumoto Kazuma, Kodama Naoya, Yokoyama Hirosumi, Sakai Kentaro
Memoirs of Faculty of Engineering, University of Miyazaki 49 65 - 68 2020.9
Language:Japanese Publishing type:Research paper (scientific journal)
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SAKAI Kentaro, IMAI Masato, IZUMI Nobuo, KOURIKI Haruna, KUNITAKE Hisato, MISAWA Naoaki, SUIKO Masahito
The Journal of Science Policy and Research Management 35 ( 1 ) 23 - 31 2020.5
Language:Japanese Publishing type:Research paper (scientific journal) Publisher:Japan Society for Research Policy and Innovation Management
Recently, many universities have been working to promote the sharing of research facilities and equipment in Japan. University of Miyazaki is also developing a sharing service system of those through two projects supported by the Ministry of Education, Culture, Sports, Science and Technology. In addition, we have established the Miyazaki Facility Network, in which public research institutions in Miyazaki Prefecture participate, and are working to create an environment that can provide mutually advanced analysis technologies that contribute to regional revitalization.In this paper, we introduce a common facilities management system linked on-line to the existing financial accounting and the researcher database developed by University of Miyazaki, and describe the relationship with the administration policy of our university and examples of utilization in Miyazaki prefecture.
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Electroactive Li incorporated cobalt oxide nanostructures for photocatalytic applications Reviewed
R. Ranjitha, Aarti S. Bhatt, C. R. Ravikumar, M. S. Santosh, B. K. Jayanna, H. P. Nagaswarupa, K. Sakai and H. Madhyastha
Materials Research Express 6 ( 11 ) 1150d6-1 - 1150d6-13 2019.11
Language:English Publishing type:Research paper (scientific journal)
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Screening of lactic acid bacteria isolated from fermented food as potential probiotics for aquacultured carp and amberjack Reviewed
N.T.H. Linh, K. Sakai, Y. Taoka
Fisheries Science 84 101 - 111 2018.1
Language:English Publishing type:Research paper (scientific journal)
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Ohori D., Fukuyama A., Sakai K., Higo A., Thomas C., Samukawa S., Ikari T.
Japanese Journal of Applied Physics 56 ( 5 ) 2017.5
Language:English Publishing type:Research paper (scientific journal) Publisher:Japanese Journal of Applied Physics
© 2017 The Japan Society of Applied Physics. GaAs quantum nanodisks (QNDs) in nanopillar (NP) arrays are considered to be an attractive candidate for photonic device applications. We report a damageless fabrication technique that can be used to produce large-area lattice-matched GaAs/AlGaAs heterostructure NP arrays through the use of a bio-template and neutral beam etching. We have successfully realized GaAs QNDs in NPs owing to nanoscale iron oxide masks included in poly(ethylene glycol)-decorated ferritin protein shells. We observed for first time the photoluminescence emission from asetched GaAs QNDs and confirmed quantum confinement by quantum mechanical calculation. Our methodology is vital for high-efficiency pillarbased optoelectronic devices such as NP laser diodes.
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Material conversion of GaAs nanowires Reviewed
K. Nishioka, H. Suzuki, K. Sakai, F. Ishikawa
Physica Status Solidi (B) 254 1600522-1 - 1600522-5 2017.2
Language:English Publishing type:Research paper (scientific journal)
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Cross-sectional transmission electron microscope observation of Si clathrate thin films grown on Si (111) substrates Reviewed
K. Sakai, H. Takeshita, T.Haraguchi, H. Suzuki, F. Ohashi, T. Kume, A. Fukuyama, S. Nonomura, T. Ikari
Thin Solid Films 621 32 - 35 2017.1
Language:English Publishing type:Research paper (scientific journal)
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Photoinduced Reduction of Nitroarenes Using a Transition-Metal-Loaded Silicon Semiconductor under Visible Light Irradiation Reviewed
K. Tsutsumi, F. Uchikawa, K. Sakai, K. Tabata
ACS Catal. 6 4394 - 4398 2016.6
Language:English Publishing type:Research paper (scientific journal)
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Thin film of guest-free type-II silicon clathrate on Si(111) wafer Reviewed
T. Kume, F. Ohashi, K. Sakai, A. Fukuyama, M. Imai, H. Udono, T. Ban, H. Habuchi, H. Suzuki, T. Ikari, S. Sasaki, S. Nonomura
Thin Solid Films 609 30 - 34 2016.5
Language:English Publishing type:Research paper (scientific journal)
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X-ray Induced Luminescence Spectroscopy of Samarium Doped Barium Sulfate Prepared by Sintering Method Reviewed
T. Kumeda, K. Maeda, Y. Shirano, K. Fujiwara, K. Sakai, T. Ikari
Journal of Physics: Conference Series 619 012038-1 - 012038-4 2015.7
Language:English Publishing type:Research paper (scientific journal)
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Photoluminescence of Valence-Changed Samarium Ions in Sintered BaSO4 Induced by X-ray Radiation Reviewed
K. Maeda, T. Kumeda, K. Arimura, K. Sakai, T. Ikari
Journal of Physics: Conference Series 619 012040-1 - 012040-4 2015.7
Language:English Publishing type:Research paper (scientific journal)
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Study on the Wire Electric Discharge Machining of Single Crystal Silicon
OHNISHI Osamu, SAKAI Kentaro, SUZUKI Hidetoshi, MORITA Sho
The Proceedings of Conference of Kyushu Branch 2015 ( 0 ) 327 - 328 2015
Language:Japanese Publishing type:Research paper (scientific journal) Publisher:The Japan Society of Mechanical Engineers
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Effects of Nitrogen Precursor on the Au-Assisted Vapor-Liquid-Solid Growth of GaAs(N) Nanostructures Reviewed
H. Suzuki, K. Sakai, T. Haraguchi, T. Yamauchi, M. Hijii, K. Maeda, T. Ikari
Journal of Crystal Growth 386 100 - 106 2014.3
Language:English Publishing type:Research paper (scientific journal)
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Low-temperature photoluminescence of Sb-doped ZnO nanowires synthesized on Sb-coated Si substrate by chemical vapor deposition method Reviewed
K. Sakai, K. Ishikura, A. Fukuyama, I.A. Palani, M.S. Ramachandra Rao, T. Okada, T. Ikari
Springer Series in Materials Science 180 331 - 339 2014.3
Language:English Publishing type:Research paper (scientific journal)
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Effect of oxygen pressure on photoluminescence spectra and hall coefficients of Li-Ni Co-Doped ZnO films grown by a pulsed laser deposition Reviewed
K. Sakai, K. Ishikura, D. Ohori, D. Nakamura, A. Fukuyama, T. Okada, M.S. Ramachandra Rao, T. Ikari
Springer Series in Materials Science 180 91 - 99 2014.3
Language:English Publishing type:Research paper (scientific journal)
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KINOSHTTA Hiroyuki, YASUI Kentaro, YASUDA Yusuke, KAMIUNTEN Shuta, YUJI Toshifumi, OKAMURA Yoshimi, SAKAI Kentaro, SEZAKI Mitsuhiro
The Proceedings of the Symposium on Environmental Engineering 2014 ( 0 ) 111 - 114 2014
Language:Japanese Publishing type:Research paper (scientific journal) Publisher:The Japan Society of Mechanical Engineers
In this study, we developed materials with high adsorption and removal performance of NO_2 gas, thereby decreasing air pollution, by exploiting the porous nature of ceramics produced when clay and crushed waste GFRP are mixed before firing. First, we examined the NO_2 gas adsorption and removal abilities of various materials, such as metals, plastics, wood, mortar, and ceramics made from clay. The results indicated that ceramics made from clay have high adsorption and removal ability for NO_2 gas. We then examined the NO_2 adsorption and removal abilities of ceramics produced by firing mixtures of clay and crushed GFRP. The results indicated that ceramics containing crushed GFRP at 20 to 60% of the total mass have high NO_2 gas adsorption and removal ability. These ceramics may be used as pavement blocks and tiles with an air cleaning function.
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X-ray and photo- luminescence properties of Sm3+ doped barium sulfide Reviewed
K. Maeda, N. Kawaida, R. Tsudome, K. Sakai and T. Ikari
physica status solidi (c) 9 2271 - 2274 2012.11
Language:English Publishing type:Research paper (scientific journal)
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Investigation of the photovoltaic performance of the polycrystalline silicon p-n junction by a photothermal measurement Reviewed
A. Fukuyama, D. Ishibashi, Y. Sato, K. Sakai, H. Suzuki, K. Nishioka, T. Ikari
Journal of Non-Crystalline Solids 358 2206 - 2208 2012.9
Language:English Publishing type:Research paper (scientific journal)
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Temperature dependence of the optical gap of diamond-like carbon films investigated by a piezoelectric photothermal spectroscopy Reviewed
W. Ding, Y. Nakano, R. Yamamoto, K. Sakai, H. Nakazawa, A. Fukuyama, and T. Ikari
Energy Procedia 10 66 - 70 2011.12
Language:English Publishing type:Research paper (scientific journal)
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Influence of Sb in synthesize of ZnO nanowire using sandwich type substrate in carbothermal evaporation method Reviewed
I. A. Palani, K. Okazaki, D. Nakamura, K. Sakai, M. Higashihata, and T. Okada
Applied Surface Science 258 3611 - 3616 2011.12
Language:English Publishing type:Research paper (scientific journal)
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Photo- and X-ray-luminescence Emission Property of Samarium Doped Barium Sulfuide Glass Ceramics
S. Ido, R. Tsudome, K. Maeda, K. Sakai, T. Ikari
40 39 - 43 2011.7
Language:Japanese Publishing type:Research paper (bulletin of university, research institution)
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Effect of the molecular weight of a polyethylene glycol on the photoluminescence spectra of porous TiO2 films for dye-sensitized solar cells Reviewed
K. Sakai, Y. Hirashita, T. Aihara, A. Fukuyama, T. Ikari, K. Kukita and S. Furukawa
Thin Solid Films 519 5760 - 5762 2011.6
Language:English Publishing type:Research paper (scientific journal)
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Determination of exciton binding energy of GaInNAs quantum well structures by piezoelectric photothermal spectroscopy compared with photoreflectance measurements Reviewed
K. Kashima, A. Fukuyama, K. Sakai, H. Yokoyama, M. Kondow, and T. Ikari
Japanese J. Appl. Phys. 50 06GH09-1 - 06GH09-4 2011.6
Language:English Publishing type:Research paper (scientific journal)
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Catalyst/dopant-free growth of ZnO nanobelts with different optical properties from nanowires grown via a catalyst-assisted method Reviewed
B. Q. Cao, Z. M. Liu, H. Y. Xu, H. B. Gong, D. Nakamura, K. Sakai, M. Higashihata and T. Okada
Cryst. Eng. Comm. 13 4282 - 4287 2011.3
Language:English Publishing type:Research paper (scientific journal)
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Stimulated Optical Emission from ZnO Nanobelts Grown with a Simple Carbothermal Evaporation Method Reviewed
B. Q. Cao, K. Sakai, D. Nakamura, I. A. Palani, H. B. Gong, H. Y. Xu, M. Higashihata, and T. Okada
J. Phys. Chem. C 115 ( 5 ) 1702 - 1707 2011.1
Language:English Publishing type:Research paper (scientific journal)
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Detection of Thermal Energy Loss of the photoexcited Carriers in Polycrystalline Silicon p-n Junction Interface Region by a Piezoelectric Photothermal Study Reviewed
H. Tamura, A. Fukuyama, K. Sakai, T. Ikari
Proceedings of Symposium on Ultrasonic Electronics 31 31 - 32 2010.11
Language:English Publishing type:Research paper (international conference proceedings)
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Low-temperature photoluminescence of phosphorous-doped ZnO nanowires synthesized by nanoparticle-assisted pulsed-laser deposition Reviewed
K. Sakai, A. Fukuyama, T. Ikari, T. Okada
Proceedings of IEEE (TENCON 2010 - 2010 IEEE Region 10 Conference) 1007 - 1010 2010.11
Language:English Publishing type:Research paper (international conference proceedings)
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光励起キャリア数を制御した圧電素子光熱変換分光法による半導体p-n接合界面の研究
田村仁, 壹岐俊洋, 境健太郎, 福山敦彦, 碇哲雄
宮崎大学工学部紀要 39 15 - 18 2010.9
Language:Japanese Publishing type:Research paper (bulletin of university, research institution)
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ダイヤモンド様炭素のPPT及びPLスペクトルに対するsp3/sp2比の影響
山元亮一, 宮本達弥, 境健太郎, 福山敦彦, 碇哲雄
宮崎大学工学部紀要 39 19 - 24 2010.9
Language:Japanese Publishing type:Research paper (bulletin of university, research institution)
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ポリエチレングリコールの分子量を変化させたチタニア多孔質薄膜の光学的特性比較
平下康貴, 境健太郎, 福山敦彦, 碇哲雄
宮崎大学工学部紀要 39 25 - 28 2010.9
Language:Japanese Publishing type:Research paper (bulletin of university, research institution)
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N添加によるGaAsN薄膜のバンド構造変化とバンド反交差モデルの比較
牟田口和真, 境健太郎, 福山敦彦, 碇哲雄
宮崎大学工学部紀要 39 29 - 34 2010.9
Language:Japanese Publishing type:Research paper (bulletin of university, research institution)
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Investigation of low-temperature excitonic and defect emission from Ni-doped ZnO nanoneedles and V-doped ZnO nanostructured film Reviewed
Shubra Singh, Daisuke Nakamura, Kentaro Sakai, Tatsuo Okada, M S Ramachandra Rao
New Journal of Physics 12 023007-1 - 023007-11 2010.2
Language:English Publishing type:Research paper (scientific journal)
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A study of the recombination process at the p-n junction interface by the photoexcited-carrier-concentration controlled piezoelectric photothermal method Reviewed
H. Tamura, T. Iki, T. Miyamoto, K. Sakai, A. Fukuyama, T. Ikari
Proceedings of Symposium on Ultrasonic Electronics 30 223 - 224 2009.11
Language:English Publishing type:Research paper (international conference proceedings)
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高感度光吸収係数測定を目的とした一定光電流実験手法の構築
壹岐俊洋, 田村仁, 境健太郎, 福山敦彦, 碇哲雄
宮崎大学工学部紀要 38 67 - 71 2009.9
Language:Japanese Publishing type:Research paper (bulletin of university, research institution)
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sp3/sp2比によるダイヤモンド様炭素薄膜の光学的特性変化
宮本達弥, 壹岐俊洋, 石井翔平, 境健太郎, 福山敦彦, 碇哲雄
宮崎大学工学部紀要 38 60 - 65 2009.9
Language:Japanese Publishing type:Research paper (bulletin of university, research institution)
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Low-Temperature Photoluminescence of nanostructured ZnO Crystal Synthesized by Pulsed-Laser Ablation Reviewed
K. Sakai, K. Noguchi, A. Fukuyama, T. Ikari, T. Okada
Japanese Journal of Applied Physics 48 085001-1 - 085001-5 2009.8
Language:English Publishing type:Research paper (scientific journal)
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Investigation of Carrier Recombination Processes in GaAs/AlAs Multiple Quantum Well Using Piezoelectric Photothermal and Surface Photovoltage Techniques Reviewed
P. Wang, K. Sakai, A. Fukuyama, T. Ikari
Japanese Journal of Applied Physics 48 07GB01-1 - 07GB01-5 2009.7
Language:English Publishing type:Research paper (scientific journal)
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Nonradiative Investigation of Photodecomposition of Poly(di-n-hexylsilan) Thin Films Using Piezoelectric Photothermal Spectroscopy Reviewed
A. Fukuyama, T. Kuroki, K. Sakai, T. Iwamoto, S. Furukawa, T. Ikari
Japanese Journal of Applied Physics 48 07GB02-1 - 07GB02-4 2009.7
Language:English Publishing type:Research paper (scientific journal)
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Detection of photogenerated carrier leakage from GaInNAs/GaAs single quantum well by piezoelectric photothermal spectroscopy Reviewed
S. Fukushima, K. Sakai, H. Yokoyama, A. Fukuyama, M. Ozeki, M. Kondow, T. Ikari
Japanese Journal of Applied Physics 47 7060 - 7064 2008.9
Language:English Publishing type:Research paper (scientific journal)
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圧電素子光熱分光法によるチタニア薄膜の光学的特性の研究
矢野伊織, 井上麻衣子, 宮本達弥, 境健太郎, 福山敦彦, 碇哲雄
宮崎大学工学部紀要 37 21 - 25 2008.8
Language:Japanese Publishing type:Research paper (bulletin of university, research institution)
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AlGaN/GaNヘテロ界面に形成される2次元電子ガスの光学的特性
福山敦彦, 有村光生, 井上麻衣子, 矢野伊織, 當瀬智之, 境健太郎, 碇哲雄
宮崎大学工学部紀要 37 15 - 20 2008.8
Language:Japanese Publishing type:Research paper (bulletin of university, research institution)
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Optical properties of nanostructured ZnO crystal synthesized by pulsed laser ablation Reviewed
K. Sakai, K. Noguchi, A. Fukuyama, T. Ikari, T. Okada
Physica E 40 2489 - 2493 2008.5
Language:English Publishing type:Research paper (scientific journal)
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Band gap energy fluctuations in InGaN films grown by RF-MBE with changing nitrogen supply rate investigated by a piezoelectric photothermal spectroscopy Reviewed
H. Komaki, T. Shimohara, K. Sakai, R. Katayama, K. Onabe, A. Fukuyama, T. Ikari
physica status solidi (c) 5 ( 2 ) 499 - 502 2008.5
Language:English Publishing type:Research paper (scientific journal)
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Effect of Ga on the structure of Ge-Se-Ga glasses from thermal analysis, Raman and XPS measurements Reviewed
K. Maeda, T. Sakai, K. Sakai, T. Ikari, M. Munzar, D. Tonchev, S. O. Kasap, G. Lucovsky
J Mater Sci: Mater Electron 18 S367 - S370 2007.3
Language:English Publishing type:Research paper (scientific journal)
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Piezoelectric photothermal study of the optical properties of microcrystalline silicon near the bandgap Reviewed
A. Fukuyama, S. Sakamoto, S. Sonoda, P. Wang, K. Sakai, T. Ikari
Thin Solid Films 511-512 112 - 116 2006.7
Language:English Publishing type:Research paper (scientific journal)
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Defect centers and optical absorption edge of degenerated semiconductor ZnO thin films grown by a reactive plasma deposition by means of piezoelectric photothermal spectroscopy Reviewed
K. Sakai, T. Kakeno, T. Ikari, S. Shirakata, T. Sakemi, K. Awai, T. Yamamoto
Journal of Applied Physics 99 ( 043508 ) 1 - 7 2006.2
Language:English Publishing type:Research paper (scientific journal)
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Investigation of Ni induced deep levels in N-Type Si by a temperature dependence of piezoelectric photothermal and surface photovoltage signals
S. Sato, S. Fukushima, S. Tanaka, K. Sakai, A. Fukuyama, T. Ikari
2005 International Semiconductor Device Research Symposium 2005 ( 1596160 ) 410 - 411 2005.12
Language:English Publishing type:Research paper (international conference proceedings)
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Piezoelectric photothermal and surface photovoltage spectra in extremely thin GaInNAs/GaAs single quantum well
S. Fukushima, T. Ikari, A. Fukuyama, K. Sakai, H. Yokoyama, M. Kondow
2005 International Semiconductor Device Research Symposium 2005 ( 1596163 ) 416 - 417 2005.12
Language:English Publishing type:Research paper (international conference proceedings)
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Carrier recombination mechanism at SiO2/Si interface studied by a photo-thermal and a surface photo-voltage spectroscopy
T. Saisho, K. Sakai, H. Hayashi, S. Sato, A. Fukuyama, M. Suemitsu, T. Ikari
2005 International Semiconductor Device Research Symposium 2005 ( 1596162 ) 414 - 415 2005.12
Language:English Publishing type:Research paper (international conference proceedings)
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Piezoelectric photo thermal and surface photo voltage spectra of chalcopyrite CuGaSe2 epitaxial layers fabricated on semi-insulating GaAs
N. Ohryoji, A. Goto, H. Yokoyama, K. Sakai, A. Fukuyama, A. Yamada, S. Niki, T. Ikari
2005 International Semiconductor Device Research Symposium 2005 ( 1596161 ) 412 - 413 2005.12
Language:English Publishing type:Research paper (international conference proceedings)
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Dependence of oxygen flow rate on piezoelectric photothermal spectra of ZnO thin films grown by a reactive plasma deposition Reviewed
T. Kakeno, K. Sakai, H. Komaki, K. Yoshino, H. Sakemi, K. Awai, T. Yamamoto, T. Ikari
Materials Science & Engineering B 118 ( 1-3 ) 70 - 73 2005.4
Language:English Publishing type:Research paper (scientific journal)
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Impurity levels in layered semiconductor GaS doped with Cu Reviewed
S. Shigetomi, K. Sakai, T. Ikari
Japanese Journal of Applied Physics 44 ( 3 ) 1306 - 1309 2005.3
Language:English Publishing type:Research paper (scientific journal)
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Impurity and defect centers of n-type 4H-SiC single crystals investigated by a photoluminescence and piezoelectric photo thermal spectroscopies Reviewed
K. Sakai, A. Fukuyama, S. Shigetomi, T. Ikari
Solid-State Electronics 48 ( 10-11 ) 1873 - 1876 2004.10
Language:English Publishing type:Research paper (scientific journal)
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Optical properties of GaAsNSe/GaAs superlattice investigated by means of piezoelectric photothermal spectroscopy for nonradiative electron transitions Reviewed
K. Sakai, S. Fukushima, A. Fukuyama, K. Uesugi, I. Suemune, T. Ikari
IEE Proceedings - Optoelectronics 151 ( 5 ) 328 - 330 2004.10
Language:English Publishing type:Research paper (international conference proceedings)
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製膜速度による微結晶シリコン薄膜の圧電素子光熱分光スペクトル変化
王萍, 多田真樹, 大田将志, 境健太郎, 福山敦彦, 碇哲雄
宮崎大学工学部紀要 33 57 - 61 2004.10
Language:Japanese Publishing type:Research paper (bulletin of university, research institution)
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Photoluminescence of layered semiconductor GaS doped with Mn Reviewed
S. Shigetomi, K. Sakai, T. Ikari
Physica Status Solidi b 241 ( 11 ) 2607 - 2612 2004.6
Language:English Publishing type:Research paper (scientific journal)
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Autocatalytic-reaction analysis of the time-evolution of the thermal recovery of EL2 in semi-insulating GaAs Reviewed
A. Fukuyama, K. Sakai, T. Ikari, Y. Akashi, M. Suemitsu
Physica B 348 348 ( 1-4 ) 1 - 5 2004.5
Language:English Publishing type:Research paper (scientific journal)
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Piezoelectric photothermal study of the optical absorption spectra of microcrystalline silicon Reviewed
P. Wang, M. Tada, M. Ohta, K. Sakai, A. Fukuyama, T. Ikari
Japanese Journal of Applied Physics 43 ( 5B ) 2965 - 2968 2004.5
Language:English Publishing type:Research paper (scientific journal)
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Characterization of deep levels in n-type 4H-SiC single crystals by means of a piezoelectric photothermal and a photoluminescence spectroscopy Reviewed
K. Sakai, S. Tada, A. Fukuyama, T. Ikari
Physica B 340-342 137 - 140 2003.12
Language:English Publishing type:Research paper (scientific journal)
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Effect of three-stage isothermal annealing on the nucleation process in GeSe2 Reviewed
K. Maeda, Y. Kai, T. Suginohara, H. Yokoyama, K. Sakai, T. Ikari, S.O. Kasap
Journal of Materials Science: Materials in Electronics 14 ( 10-12 ) 839 - 840 2003.10
Language:English Publishing type:Research paper (scientific journal)
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熱処理によるGeSe2ガラスの結晶核生成過程の研究
甲斐康之, 境健太郎, 横山宏有, 吉野賢二, 碇哲雄, 前田幸治
宮崎大学工学部紀要 32 129 - 133 2003.7
Language:Japanese Publishing type:Research paper (bulletin of university, research institution)
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Ge-Se系ガラスの結晶化過程の組成依存性
水本卓, 境健太郎, 横山宏有, 吉野賢二, 碇哲雄, 前田幸治
宮崎大学工学部紀要 32 135 - 139 2003.7
Language:Japanese Publishing type:Research paper (bulletin of university, research institution)
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Photo-enhanced crystallization by laser irradiation and thermal annealing in amorphous GeSe2 Reviewed
K. Sakai, K. Maeda, H. Yokoyama, T. Ikari
Journal of Non-Crystalline Solids 320 ( 1-3 ) 223 - 230 2003.6
Language:English Publishing type:Research paper (scientific journal)
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Piezoelectric photothermal spectra of Co doped ZnO semiconductor Reviewed
K. Sakai, A. Fukuyama, T. Toyoda, T. Ikari
Japanese Journal of Applied Physics 41 ( 1-5B ) 3371 - 3373 2002.5
Language:English Publishing type:Research paper (scientific journal)
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The intensity and wavelength dependence for photo-induced crystallization process in amorphous GeSe2 Reviewed
K. Sakai, K. Maeda, H. Yokoyama, T. Ikari
Springer Proceedings in Physics 87 226 - 227 2001.12
Language:English Publishing type:Research paper (international conference proceedings)
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Piezoelectric photothermal study of AlxGa1–xAs epitaxial layer (x = 0.22, 0.28, and 0.5) grown on semi-insulating GaAs substrate Reviewed
A. Fukuyama, H. Fukuhara, S. Tanaka, A. Memon, K. Sakai, Y. Akashi, T. Ikari
Journal of Applied Physics 90 ( 9 ) 4385 - 4391 2001.11
Language:English Publishing type:Research paper (scientific journal)
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GeSe2ガラスの熱結晶化過程のアニール条件依存性
杉之原貴洋, 甲斐康之, 境健太郎, 横山宏有, 吉野賢二, 碇哲雄, 前田幸治
宮崎大学工学部紀要 30 69 - 74 2001.9
Language:Japanese Publishing type:Research paper (bulletin of university, research institution)
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Investigation of deep levels in semi-insulating GaAs by means of the temperature change piezoelectric photo-thermal measurements Reviewed
A. Fukuyama, A. Memon, K. Sakai, Y. Akashi, T. Ikari
Journal of Applied Physics 89 ( 3 ) 1751 - 1754 2001.2
Language:English Publishing type:Research paper (scientific journal)
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Annealing time and temperature dependence for photo-induced crystallization in amorphous GeSe2 Reviewed
K. Sakai, T. Uemoto, H. Yokoyama, A. Fukuyama, K. Yoshino, T. Ikari, K. Maeda
Journal of Non-Crystalline Solids 266-269 ( 2 ) 933 - 937 2000.5
Language:English Publishing type:Research paper (scientific journal)
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Crystallization of amorphous GeSe2 semiconductor by isothermal annealing without light radiation Reviewed
K. Sakai, K. Yoshino, A. Fukuyama, H. Yokoyama, T. Ikari, K. Maeda
Japanese Journal of Applied Physics 39 ( 1-3A ) 1058 - 1061 2000.3
Language:English Publishing type:Research paper (scientific journal)