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Creation of Multi-Gas Sensor Performance by Dominance of High-Precision Nano-Micro VO2 Three-Dimensional Structure

Research Project

Project/Area Number 22K14567
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 28030:Nanomaterials-related
Research InstitutionUniversity of Hyogo (2023)
Osaka University (2022)

Principal Investigator

Osaka Ai  兵庫県立大学, 工学研究科, 助教 (70868299)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2022: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Keywords表面加工 / 強相関電子系材料 / 二酸化バナジウム / 相転移 / VO2 / 薄膜 / 金属絶縁体相転移 / 表面処理 / ナノ構造体 / マルチセンサ
Outline of Research at the Start

室温近傍で金属絶縁体相転移により巨大な抵抗変化を示す二酸化バナジウム(VO2)はセンサ材料の有力候補である。本研究ではVO2の温度抵抗係数(TCR)の向上と転移点分布の選択制御を実現する。独自技術を駆使し、基板表面性情とVO2ナノ試料形状を精密に制御し相転移特性を決定づける結晶ひずみ量を変調することで、60 Kの温度範囲で相転移点を持ち、TCR=100%/KVO2ナノ-マイクロ集積構造を創製する。

Outline of Final Research Achievements

To create multi-sensor functionality by leveraging the conduction properties of vanadium dioxide (VO2), the surface structure of growth substrates and the three-dimensional structure of VO2 samples were systematically varied to evaluate changes in phase transition characteristics. Using proprietary surface treatment techniques, the surface roughness of Si substrates was controlled at the nanometer-scale. We clearly demonstrated that the phase transition temperature of VO2 films decreased as the substrate surface roughness increased. Additionally, by altering the sample structure at the micro-level, we revealed that decline of the sample size resulted in a lower phase transition temperature for VO2 samples, under constant film thickness conditions. Based on these findings, a methodology to integrate VO2 samples with controllable phase transition temperatures was demonstrated, aiming to extract functional properties that contribute to high-sensitivity multi-sensor performance.

Academic Significance and Societal Importance of the Research Achievements

強相関金属酸化物の相転移物性は、魅力的であるが、制御が難しいという特徴がある。本研究は物性研究を加工学と融合させることで今まで外乱とされてきた構造因子を人為制御し、強相関金属酸化物の薄膜物性を制御する、いわば薄膜物性を基板に書き込むといった新たな制御手法のコンセプトを実証するものである。機能が書き込まれた基板上で試料サイズを作り分けることでさらに多様な物性制御が実現でき、今までの画一的な物性制御手法では実現不可能であったマルチ機能inモノ材料を実現する。これは多くの機能性酸化物薄膜に共通展開できる技術であり、将来応用としてセンサ、目盛り、人工知能デバイスなど、その波及効果は非常に大きい。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (5 results)

All 2023 2022

All Presentation (5 results) (of which Int'l Joint Research: 2 results,  Invited: 3 results)

  • [Presentation] First-principles calculations for the etching of Si in pure water assisted due to the catalysis of Pt2023

    • Author(s)
      A. I. Osaka, D. Toh, K. Kayao, K. Itagaki, H. Yamasaki, Y. Morikawa, K. Yamauchi, Y. Sano
    • Organizer
      International Conference of Numerical Analysis and Applied Mathematics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] VO2マイクロチャネルで顕在化した結晶配向に依存した特異な相転移特性2023

    • Author(s)
      大坂藍、Liliany N. Pamsi、服部賢、郭方准、田中秀和、服部梓
    • Organizer
      材料WEEKワークショップ
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Metal-insulator transition property modulation of strongly correlated VO2 by strain gradient2023

    • Author(s)
      S. S. MANE, A. N. HATTORI, A. I. OSAKA, H. TANAKA
    • Organizer
      The 26th SANKEN International Symposium
    • Related Report
      2022 Research-status Report
  • [Presentation] Si基板上のVO2マイクロチャネルにおける金属相の不均一分布が導く非線形THz電場増強2022

    • Author(s)
      大坂藍,永井正也, 玄地真悟, 任慧, 田中秀和, 服部梓
    • Organizer
      第8回材料WEEK「材料シンポジウムワークショップ」
    • Related Report
      2022 Research-status Report
  • [Presentation] First-principles calculations for the etching mechanism of function materials in pure water assisted by Pt catalyst2022

    • Author(s)
      A. I. Osaka, D. Toh, K. Itagaki, H. Yamasaki, Y. Morikawa, A. N. Hattori and K. Yamauchi
    • Organizer
      18th International Conference of Computational Methods in Sciences and Engineering
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2022-04-19   Modified: 2025-01-30  

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