Graphene Oxide as a Sensing Material for Gas Detection Based on Nanomechanical Sensors in the Static Mode
Graphene Oxide as a Sensing Material for Gas Detection Based on Nanomechanical Sensors in the Static Mode
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DOI：
10.3390/chemosensors8030082
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发表时间：
2020-09-01
期刊：
影响因子：
4.2
通讯作者：
Obata, Seiji
中科院分区：
文献类型：
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作者：
Imamura, Gaku;Minami, Kosuke;Obata, Seiji
石墨烯具有高比表面积和巨大的化学修饰潜力，是气敏应用的关键材料。为了充分利用石墨烯的潜力，需要一种与导电性能无关的传感平台。在这项研究中，我们采用膜型表面应力传感器（MSS）-一种在静态模式下工作的纳米机械传感器-作为传感平台，并利用氧化石墨烯（GO）作为气敏材料。MSS检测由气体吸附引起的表面应力;因此，具有低电导率的化学改性石墨烯可以用作气敏材料。我们通过测量其对五种气体的响应来评估GO涂覆的MSS的传感性能。我们证明了与GO涂层MSS的GO作为静态模式纳米机械传感器的气敏材料的可行性，并揭示了其对水蒸气的高选择性。此外，通过与还原氧化石墨烯和石墨粉涂覆的MSS的传感性能进行比较，研究了GO涂覆的MSS的传感机理，并推导出影响灵敏度和选择性的关键因素。考虑到GO涂层MSS的高灵敏度和MSS可以实现的紧凑测量系统，本研究为石墨烯的传感应用提供了新的视角。
Graphene is a key material for gas sensing applications owing to its high specific surface area and vast chemical modification potential. To fully utilize the potential of graphene, a sensing platform independent of conductive properties is required. In this study, we employed membrane-type surface stress sensors (MSS)-A kind of nanomechanical sensor operated in the static mode-As a sensing platform and utilized graphene oxide (GO) as a gas sensing material. MSS detect surface stress caused by gas sorption; therefore, chemically modified graphene with low conductivity can be utilized as a gas sensing material. We evaluated the sensing performance of a GO-coated MSS by measuring its responses to five gases. We demonstrated with the GO-coated MSS the feasibility of GO as a gas sensing material for static mode nanomechanical sensors and revealed its high selectivity to water vapor. Moreover, we investigated the sensing mechanism of the GO-coated MSS by comparing it with the sensing performance of MSS coated with reduced graphene oxide and graphite powder and deduced key factors for sensitivity and selectivity. Considering the high sensitivity of the GO-coated MSS and the compact measurement system that MSS can realize, the present study provides a new perspective on the sensing applications of graphene.