NAGAOKA Akira

写真a

Affiliation

Engineering educational research section Research & Development Center for Sustanable Energy and Environmental Engineering

Title

Associate Professor

External Link

Degree 【 display / non-display

  • 博士(工学) ( 2014.3   宮崎大学 )

Research Areas 【 display / non-display

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electric and electronic materials

  • Nanotechnology/Materials / Energy chemistry

Education 【 display / non-display

  • University of Miyazaki

    2011.4 - 2014.3

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    Country:Japan

  • University of Miyazaki   Graduate School, Division of Engineering

    2009.4 - 2011.3

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    Country:Japan

  • University of Miyazaki   Faculty of Engineering

    2005.4 - 2009.3

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    Country:Japan

External Career 【 display / non-display

  • 東京工業大学フロンティア材料科学研究所   共同研究員

    2017.4

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    Country:Japan

  • 九州大学応用力学研究所   共同研究員

    2017.4

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    Country:Japan

  • Kyoto University

    2017.4 - 2018.10

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    Country:Japan

  • University of Utah   日本学術振興会海外特別研究員

    2015.4 - 2017.3

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    Country:United States

  • Kyoto University

    2014.4 - 2015.3

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    Country:Japan

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Professional Memberships 【 display / non-display

  • JSAP: Japan Society of Applied Physics

  • IEEE

  • Division of Crystals Science and Technology

  • Professional Group of Multinary Compounds and Solar Cells

  • Thermoelectrics Society of Japan

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Papers 【 display / non-display

  • 200℃以下において高熱電出力因子を示す熱電材料ZnSnAs2 Reviewed

    中島 康貴 , 永岡章, 長友克馬, 平井優一, 西岡 賢祐

    Journal of Ternary and Multinary Compounds   2023   47 - 50   2024.1

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.57386/tmc.2023.0_47

  • シミュレーションによる多元系熱電材料Cu2ZnSnS4の熱電変換効率の評価 Reviewed

    長友 克馬, 永岡 章, 西岡 賢祐

    Journal of Ternary and Multinary Compounds   2023   13 - 16   2024.1

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: https://doi.org/10.57386/tmc.2023.0_13

  • Photoelectrochemical properties of p-type CuBi2O4 prepared by spray pyrolysis of carbon-free precursor aqueous solution combined with post-annealing treatment Reviewed

    Wakishima K., Higashi T., Nagaoka A., Yoshino K.

    New Journal of Chemistry   48   131 - 143   2023.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:New Journal of Chemistry  

    Energy conversion using semiconductor-based photoelectrodes for photoelectrochemical (PEC) water splitting is a promising technology that contributes to an environmentally friendly society. CuBi2O4 is a p-type semiconductor material that can be used in visible-light-responsive photocathodes. To date, the fabrication of CuBi2O4 has been examined using wet processes such as spray pyrolysis of precursor solutions containing organic solvents and organic additives. Spray pyrolysis causes problems such as CO2 emission during the decomposition of the precursor solution. In this study, we established a carbon-free method for the fabrication of CuBi2O4 using a precursor solution comprising Cu(NO3)2 and Bi(NO3)3 dissolved in a dilute nitric acid aqueous solution. The aqueous precursor solution was sprayed onto F-doped tin oxide-coated glass substrates, followed by post-annealing treatment in the temperature range of 400-700 °C for 1 h in air. An annealing temperature over 500 °C provides CuBi2O4 as revealed by the results of X-ray diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy characterization. The PEC properties of the CuBi2O4 photoelectrodes were investigated to determine the optimal post-annealing conditions for maximizing the photocurrent density under AM 1.5G solar illumination. The optimized CuBi2O4 photoelectrodes generated a photocurrent density of −0.94 mA cm−2 at 0.6 V vs. a reversible hydrogen electrode in a potassium phosphate aqueous solution with the H2O2 sacrificial reagent. This study provides rational guidelines for visible-light-absorbing p-type metal oxide-based photoelectrodes utilizing a carbon-free preparation process.

    DOI: 10.1039/d3nj04878k

    Scopus

  • 蛍光X線ホログラフィーによるgroup-V doped CdTe中の点欠陥の直接観察 Invited Reviewed

    永岡 章

    放射光   36 ( 6 )   280 - 287   2023.11

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

  • Single crystal growth of multinary thermoelectric kesterite materials from solution Invited Reviewed

    Nagatomo Katsuma, Nagaoka Akira

    Journal of the Japanese Association for Crystal Growth   50 ( 3 )   50-3-07 pp1 - 50-3-07 pp8   2023.10

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    Authorship:Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:The Japanese Association for Crystal Growth  

    DOI: 10.19009/jjacg.50-3-07

    CiNii Research

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Books 【 display / non-display

  • 国立大学で工学を学ぼう vol. 2

    永岡 章( Role: Contributor ,  身近な温度差を電気に換える「熱電変換」材料)

    株式会社フロムページ  2022.1 

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    Language:Japanese Book type:Scholarly book

  • Copper Zinc Tin Sulfide-Based Thin Film Solar Cells

    Akira Nagaoka and Kenji Yoshino( Role: Joint author ,  Chapter 6 Growth of CZTS single crystals)

    Wiley  2015 

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    Responsible for pages:133-148   Language:Japanese Book type:Scholarly book

  • 電子機器・部品における故障・発火原因解析と対策技術

    永岡章, 吉野賢二( Role: Joint author)

    技術情報協会  2014 

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    Responsible for pages:587-591   Language:Japanese Book type:Scholarly book

MISC 【 display / non-display

  • 廃熱を有効活用する環境調和型熱電変換デバイスの開発 Invited

    永岡 章

    月刊機能材料   ( 3月号 )   2023.3

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

  • 研究室紹介 宮崎大学工学部 環境・エネルギー工学研究センター Invited

    永岡 章

    日本熱電学会誌   19 ( 2 )   82 - 83   2022.12

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    Authorship:Lead author   Language:Japanese   Publishing type:Internal/External technical report, pre-print, etc.   Publisher:日本熱電学会  

  • 無次元性能指数ZT=1.6を示す環境調和型Cu2ZnSnS4単結晶 Invited

    永岡 章

    日本熱電学会誌   18 ( 3 )   142   2022.4

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:日本熱電学会  

  • 自動車廃熱の有効活用へ向けた環境調和型熱電変換材料の開発 Invited

    永岡 章

    月刊車載テクノロジー   ( 12月号 )   61 - 65   2021.12

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

  • Doping control in a cadmium telluride photovoltaic device Invited

    NAGAOKA Akira

    Oyo Buturi   89 ( 11 )   661 - 665   2020.11

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

    Control of the electronic defect populations in CdTe by the combination of group-V element doping and Cd-rich composition is the most promising current strategy for maximizing acceptor doping while preserving the high minority carrier lifetime. In this paper, we will summarize some recent results that contributed to a better understanding of the group-V doping process in CdTe. We will also review some of the topics that are important for CdTe photovoltaics.

    DOI: 10.11470/oubutsu.89.11_661

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Presentations 【 display / non-display

  • 硝酸塩水溶液のスプレー熱分解で作製したp型CuBi2O4の光電気化学特性

    脇島 海晴,東 智弘,永岡 章,吉野 賢二

    第14回半導体材料・デバイスフォーラム 

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    Event date: 2023.12.9

    Presentation type:Poster presentation  

  • カーボンニュートラル達成に向けた未利用熱エネルギーの活用技術研究開発 Invited

    永岡 章

    第23回「野口賞」授賞式講演会  2023.12.4 

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    Event date: 2023.12.4

    Language:Japanese   Presentation type:Oral presentation (general)  

  • デバイス応用に向けたBi2Te3結晶の熱電特性評価

    平井 優一, 永岡 章,中島康貴, 長友 克馬, 太田 靖之, 西岡 賢祐

    2023年度多元系化合物・太陽電池研究会 年末講演会 

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    Event date: 2023.12.1 - 2023.12.2

    Language:Japanese   Presentation type:Oral presentation (general)  

  • 熱電材料Bi2Te3の結晶成長温度による伝導型制御

    田添 真悠,永岡 章,平井 優一,西岡 賢祐

    2023年度多元系化合物・太陽電池研究会 年末講演会 

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    Event date: 2023.12.1 - 2023.12.2

    Language:Japanese   Presentation type:Poster presentation  

  • 多元系熱電材料ZnSnAs2の性能評価

    三浦 昌真, 永岡 章, 中島 康貴, 西岡 賢祐

    2023年度多元系化合物・太陽電池研究会 年末講演会 

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    Event date: 2023.12.1 - 2023.12.2

    Language:Japanese   Presentation type:Poster presentation  

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Awards 【 display / non-display

  • 第23回野口賞奨励賞

    2023.12   野口遵顕彰会   環境調和型熱電変換デバイスの開発

    永岡 章

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    Award type:Award from publisher, newspaper, foundation, etc. 

  • 一般功労者表彰

    2023.10   木城町  

    永岡 章

  • 第16回 日本熱電学会優秀論文賞

    2023.9   一般社団法人日本熱電学会   Chalcostibite Single Crystal CuSbS2 as High Performance Thermoelectric Material

    Akira Nagaoka, Manato Takeuchi, Yusuke Shigeeda, Koki Kamimizutaru, Kenji Yoshino and Kensuke Nishioka

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    Award type:Award from Japanese society, conference, symposium, etc. 

  • 令和4年度 コニカミノルタ画像科学奨励賞

    2023.3   公益財団法人コニカミノルタ科学技術振興財団   蛍光X線ホログラフィーによるII-VI族化合物半導体の欠陥化学の再構築

    永岡 章

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    Award type:Award from publisher, newspaper, foundation, etc.  Country:Japan

  • 第13回半導体材料・デバイスフォーラム ポスター発表奨励賞

    2022.10   半導体デバイスフォーラム実行委員会  

    岡本 晃一,永岡 章,重枝 祐輔,吉野 賢二,西岡 賢祐

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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Grant-in-Aid for Scientific Research 【 display / non-display

  • 機能性粒界を活用した高効率熱電変換材料の開発

    Grant number:23H01910  2023.04 - 2027.03

    独立行政法人日本学術振興会  科学研究費補助金  基盤研究(B)

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    Authorship:Principal investigator 

  • IoT用独立型電源のための環境調和型多元系熱電材料の無次元性能指数向上

    Grant number:20K15221  2020.04 - 2024.03

    独立行政法人日本学術振興会  科学研究費補助金  若手研究

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    Authorship:Principal investigator 

  • 高品質ケステライト化合物バルク単結晶を用いた高効率太陽電池デバイスの創製

    2017.04 - 2020.03

    科学研究費補助金  特別研究員奨励費

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  • 高効率太陽電池のためのケステライト化合物単結晶成長と電気特性を中心とした物性評価

    2015.04 - 2017.03

    科学研究費補助金  特別研究員奨励費

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    Authorship:Principal investigator 

  • 高効率太陽電池のための新規多元系材料の単結晶成長と基礎物性の解析

    2013.04 - 2015.03

    科学研究費補助金  特別研究員奨励費

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    Authorship:Principal investigator 

Other research activities 【 display / non-display

  • 東京工業大学フロンティア材料研究所共同研究員

    2020.04

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    東京工業大学フロンティア材料研究所の共同研究員として、東京工業大学安井助教と熱電材料に関する共同開発を継続中。

  • 九州大学応用力学研究所共同研究員

    2019.04

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    九州大学応用力学研究所共同研究員九州大学柿本教授と熱電材料に関する共同開発を継続中。

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