Thermal switching device based on thermal properties change by intercalation

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K21081
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 26:Materials engineering and related fields
• Research Institution: Nagoya University
• Principal Investigator: Ujihara Toru 名古屋大学, 未来材料・システム研究所, 教授 (60312641)
• Co-Investigator(Kenkyū-buntansha): 原田 俊太 名古屋大学, 未来材料・システム研究所, 准教授 (30612460)
• Project Period (FY): 2020-07-30 – 2022-03-31
• Keywords: インターカレーション / 熱伝導

Outline of Final Research Achievements

We are attempting to develop "thermal switch materials" that can reversibly change adiabatic and high thermal conductive states by electrochemical insertion and desorption of ions into and out of the crystal structure.
We are attempting to develop "thermal switch materials" that can reversibly change between adiabatic and high thermal conductive states by electrochemical insertion and desorption of ions into the crystal structure. In our previous studies, we found that in the case of hydrogen insertion into amorphous WO3 thin films (HxWO3), the thermal conductivity decreases with H insertion in the range x = 0 ~ 0.32, but at x = 0.32, the thermal conductivity increases significantly, and at x > 0.32, the thermal conductivity decreases with H insertion.
The thermal conductivity of (HxWO3) decreases with H insertion in the range x=0,0.32, but increases significantly for x = 0.32, and then decreases again for x>0.32. This complex change in thermal conductivity is caused by the H insertion.

Free Research Field

結晶成長

Academic Significance and Societal Importance of the Research Achievements

新たな機能性の追求は、物質を新たな観点で見直すことであり、そこには発見がある。本研究では、非晶質へのイオン挿入・脱離でみられる熱伝導率の動的変化を追求する。この過程では一般的に熱伝導率の低い非晶質が高熱伝導化する。これは局所的な結晶性やそのネットワーク構造等、非晶質性と結晶性の物性を橋渡しする現象である。本研究では、これまで遅れていた非晶質の熱物性に迫る。本研究の発展形の一つは電子デバイス中に熱制御部を組み込んだ、デバイス内蔵型熱設計である。