Journal
SENSORS
Volume 17, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/s17102415
Keywords
ZnO nanopowders; RGO; PVP; capacitive humidity sensor
Funding
- National Natural Science Foundation of China [61474028, 61774042]
- Shanghai Municipal Natural Science Foundation [17ZR1446500]
- National S&T Project of Fudan University [2013ZX02303-004]
- First-Class Construction project of Fudan University
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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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