講演情報
[17a-K501-3]Highly Sensitive Electrical Sensing Using Semi-metal MoO3-x Nanorods for Biological Related Gases
〇(D)Jiaqi YANG1, Yan DING1, Tang DANG1, Hitoshi TABATA1, Hiroaki MATSUI1 (1.The University of Tokyo)
キーワード：
gas sensing、semi-metals、MoO3-x
Gas sensing of volatile organic compounds (VOCs) is crucial for early disease detection, enabling rapid, precise monitoring of disease-related metabolites through non-invasive methods. Among VOCs, acetic acid is a key biomarker for metabolic disorders and diseases like diabetes and gastrointestinal conditions, making its detection highly valuable for diagnostics. However, traditional metal oxide semiconductor (MOS)-based gas sensors face challenges in sensitivity, selectivity, and high power consumption, limiting their application[1].In contrast, semimetallic materials, with unique electronic structures and high surface state density, offer innovative solutions for enhanced gas sensing[2]. Here, we present a high-performance gas sensor using MoO3-x nanorods, where oxygen vacancy-induced semimetallic properties improve sensitivity and selectivity, particularly for acetic acid detection[3]. Precise tuning of the oxidation state and nanostructure optimized the material's surface chemistry. Adding single-layer graphene further boosted electrical conductivity and electron transfer efficiency.MoO3-x nanorods were fabricated via pulsed laser deposition (PLD), demonstrating excellent acetic acid detection at room temperature. The sensor achieved a detection limit as low as 500 ppt, with a linear relationship between response intensity and acetic acid concentration. It also exhibited fast response times, high stability, and repeatability, proving its suitability for practical applications in complex environments. This study supports the development of next-generation low-power, high-sensitivity gas sensors and offers a reliable approach for acetic acid detection as a biomarker.