MoS2/Graphene Oxide/C60-OH Nanostructures Deposited on a Quartz Crystal Microbalance Transducer for Humidity Sensing

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In this work, MoS 2 /graphene oxide (GO)/C 60 -OH nanocomposites are synthesized by a hydrothermal method and deposited on a quartz crystal microbalance (QCM) transducer for humidity detection. Microscopic characterization shows that the nanocomposites are composed of GO/C 60 -OH composite encapsulated MoS 2 nanoflowers. The QCM humidity sensor with MoS 2 /GO/C 60 -OH nanocomposites as the sensing film demonstrates an excellent response and recovery times (1.3/1.2 s), which are shorter than most QCM humidity sensors proposed at present. Meanwhile, the QCM humidity sensor has a high sensitivity (31.8 Hz/% RH), which is approximately 3 times that of the QCM humidity sensor based on pure GO. It is possible that the support of MoS 2 nanoflowers significantly weakens the stacking effect of GO films and accelerates the diffusion rate of water molecules in the composites. Besides this, the addition of C 60 -OHs can also greatly increase water absorption sites in the composites, thus improving the sensor’s humidity-sensitive response. Owing to its fast response/recovery rate, the proposed MoS 2 /GO/C 60 -OH-based QCM humidity sensor can be used for human respiratory status detection with digital frequency output signals.