Oxide thermoelectric materials with built-in bulk nanoheterostructures

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289242
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Inorganic materials/Physical properties
• Research Institution: Kyushu University
• Principal Investigator: Ohtaki Michitaka 九州大学, 総合理工学研究科(研究院), 教授 (50223847)
• Co-Investigator(Kenkyū-buntansha): 渡邊 厚介 九州大学, エネルギー基盤技術国際教育研究センター, 助教 (40617007)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: ナノ微細構造 / ヘテロ界面 / 酸化亜鉛 / 酸化物熱電変換材料 / 共ドープ / フォノン散乱 / 熱伝導率 / ナノ粒子

Outline of Final Research Achievements

Nano-heterostructured ZnO ceramics were prepared by multinary doping and dispersion of metallic nanoparticles into the bulk oxide samples. Significantly different nanostructures with also different scattering mechanisms were obtained with different dopants, suggesting an enhancement of multiple scattering mechanisms might be possible by carefully selecting a combination of dopants. Dispersion of metallic nanoparticles such as Au and Ag were also enabled us to enhance the electrical conductivity and to reduce the thermal conductivity simultaneously. Nanoheterostructures are thereby strongly suggested to be promising to further improve the thermoelectric performance of oxide-based thermoelectric materials.

Free Research Field

無機材料化学、工業物理化学