Construction of Production Base of Strain-Controlled Graphene Nanoribbon-Base Bio-Sensor for Detecting Multi-Molecules in Liquid

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K18665
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 18:Mechanics of materials, production engineering, design engineering, and related fields
• Research Institution: Tohoku University
• Principal Investigator: Miura Hideo 東北大学, 工学研究科, 教授 (90361112)
• Project Period (FY): 2021-07-09 – 2023-03-31
• Keywords: ひずみ / グラフェン / 分子吸着 / バイオセンサ / 界面制御

Outline of Final Research Achievements

The effect of substrate material and strain on the gas-molecule adsorption behavior of graphene was clarified quantitatively by applying the first principles calculation. It was found that the electronic band structure of graphene varied drastically from electron conduction type to hole conduction type as a strong function of the substrate material. In addition, the direct growth process of carbon nanotube on graphene was successfully developed. The grown CNT plays an important role as catalyst for improving the sensitivity of gas molecules. It was validated that the adsorption energy of NO2 gas molecule was improved under the application of uniaxial strain by 15 meV/1%-strain. These results clearly indicate the possibility of the development of multi-gas detecting sensor with high sensitivity and selectivity.

Free Research Field

材料強度科学

Academic Significance and Societal Importance of the Research Achievements

CNT-グラフェンハイブリッドセンサはグラフェン単体センサより約6倍の感度向上と約5倍の脱離速度を有することを実証し，センサの高性能化に向けた設計指針を構築できた．またグラフェンの電気抵抗率変化の歪み依存性をシリコンデバイス比約1000倍にまで向上させることもでき，超高感度歪みセンサへの応用可能性も示した．本研究成果の独創性や工学的有用性などは国内外の学会賞の受賞などでも評価されている．これにより危険環境中の有害物質検出や，人体の体液や血液中の目標分子の存在や濃度を高感度で定量的に検出可能なマルチ分子選択センサ開発に向けた歪み制御多機能バイオセンサ開発の基盤技術の構築ができたものと考えている．