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Stable and Fast-Response Capacitive Humidity Sensors Based on a ZnO Nanopowder/PVP-RGO Multilayer
- Source :
- Sensors; Volume 17; Issue 10; Pages: 2415, Sensors (Basel, Switzerland), Sensors, Vol 17, Iss 10, p 2415 (2017)
- Publication Year :
- 2017
- Publisher :
- MDPI AG, 2017.
-
Abstract
- 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.
- Subjects :
- Materials science
PVP
Capacitive sensing
Oxide
chemistry.chemical_element
Nanotechnology
02 engineering and technology
Zinc
lcsh:Chemical technology
ZnO nanopowders
RGO
capacitive humidity sensor
01 natural sciences
Biochemistry
Article
Analytical Chemistry
law.invention
chemistry.chemical_compound
law
0103 physical sciences
lcsh:TP1-1185
Electrical and Electronic Engineering
Instrumentation
010302 applied physics
Nanocomposite
Aqueous solution
Graphene
Humidity
021001 nanoscience & nanotechnology
Atomic and Molecular Physics, and Optics
Hysteresis
chemistry
Chemical engineering
0210 nano-technology
Subjects
Details
- ISSN :
- 14248220
- Volume :
- 17
- Database :
- OpenAIRE
- Journal :
- Sensors
- Accession number :
- edsair.doi.dedup.....864202adf0e9b7626ca90ffd31148b66