Yang Hui, Ye Qiangqiang, Zeng Ruixue, Zhang Junkai, Yue Lei, Xu Ming, Qiu Zhi-Jun, Wu Dongping
State Key Laboratory of ASIC and System, Fudan University, Shanghai 200433, China.
School of Information Science and Technology, Fudan University, Shanghai 200433, China.
Sensors (Basel). 2017 Oct 23;17(10):2415. doi: 10.3390/s17102415.
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.
在本文中，通过将氧化锌（ZnO）纳米粉末和聚乙烯吡咯烷酮还原氧化石墨烯（PVP-RGO）纳米复合材料的水悬浮液依次滴涂在叉指电极上制备了电容式湿度传感器。与PVP-RGO/ZnO、PVP-RGO和ZnO对应物相比，ZnO/PVP-RGO传感器在灵敏度和线性度方面都有显著提高。此外，所制备的ZnO/PVP-RGO传感器表现出相当小的滞后、快速的响应恢复时间和长期稳定性。基于形态和结构分析，可以推断ZnO/PVP-RGO传感器优异的湿度传感性能可能归因于多层结构的高比表面积和PVP-RGO纳米复合材料的支撑作用。因此，这项工作的结果为设计利用半导体氧化物材料和PVP-RGO纳米复合材料的多层结构的高性能湿度传感器提供了充分的指导。
