Sensing Mechanism of Graphene-Assist Oxide Gas Sensor and Fabrication of Mixed Gas Sensor

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01638
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26030:Composite materials and interfaces-related
• Research Institution: Kyoto Institute of Technology (2023); Osaka University (2021-2022)
• Principal Investigator: Sugahara Tohru 京都工芸繊維大学, 材料化学系, 教授 (20622038)
• Co-Investigator(Kenkyū-buntansha): 小野 尭生 大阪大学, 産業科学研究所, 助教 (00752875) ; 永村 直佳 国立研究開発法人物質・材料研究機構, 先端材料解析研究拠点, 主任研究員 (40708799)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: ガスセンサ

Outline of Final Research Achievements

In this study, in order to clarify the mechanism of the graphene-assisted MoOx nanorod gas sensor and apply it to a composite gas sensor, we will continue to separate each element and evaluate the interactions between each material in detail in 2022. In clarifying the conduction mechanism, we reproduced the graphene-assisted MoOx nanorod gas sensor's n-type and p-type conduction (ambipolarity), and elucidated it with collaborators by conducting conductivity evaluation by separating the nanorod and seed layer, gas analysis before and after adsorption and desorption, and surface observation (nanomaterials). In addition, we created a transistor structure using MoOx nanorod arrays and obtained gas sensing characteristics for each gate voltage that reproduced the charge transfer state during gas sensing. Furthermore, we measured the transistor characteristics of the device under various temperature conditions and analyzed the conduction mechanism during gas sensing.

Free Research Field

デバイス工学

Academic Significance and Societal Importance of the Research Achievements

人間の呼気に含まれる微量な濃度のガスをその場で検出・検査することにより、日頃の健康状態の診断や重大疾患の早期発見・治療に繋げる研究が進められている。このような社会ニーズの下、低濃度でも確実に検出可能でかつ安価なガスセンサの開発が求められている。
ナノ材料を用いた半導体式ガスセンサは、多種類のガスを低濃度でも検出することが可能であることから、近年、ヘルスケア関連機器への搭載に向けて精力的な研究開発進められている。