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Stable and Fast-Response Capacitive Humidity Sensors Based on a ZnO Nanopowder/PVP-RGO Multilayer

Hui YangState Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, ChinaQiangqiang YeState Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, ChinaRuixue ZengState Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, ChinaJunkai ZhangState Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, ChinaLei YueState Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, ChinaMing XuState Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, ChinaZhi‐Jun QiuSchool of Information Science and Technology, Fudan University, Shanghai 200433, ChinaDongping WuState Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, China

2017en

ABI

Annotatsiya

In this paper, capacitive-type humidity sensors were prepared by sequentially drop-coating the aqueous suspensions of zinc oxide (ZnO) nanopowders and polyvinyl pyrrolidone-reduced graphene oxide (PVP-RGO) nanocomposites onto interdigitated electrodes. Significant improvements in both sensitivity and linearity were achieved for the ZnO/PVP-RGO sensors compared with the PVP-RGO/ZnO, PVP-RGO, and ZnO counterparts. Moreover, the produced ZnO/PVP-RGO sensors exhibited rather small hysteresis, fast response-recovery time, and long-term stability. Based on morphological and structural analyses, it can be inferred that the excellent humidity sensing properties of the ZnO/PVP-RGO sensors may be attributed to the high surface-to-volume ratio of the multilayer structure and the supporting roles of the PVP-RGO nanocomposites. The results in this work hence provide adequate guidelines for designing high-performance humidity sensors that make use of the multilayer structure of semiconductor oxide materials and PVP-RGO nanocomposites.

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DOI: 10.3390/s17102415

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