期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 267, 期 -, 页码 42-50出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.03.069
关键词
Humidity sensors; Graphene; Thin film; Response/recovery; Band gap
资金
- Research and Development Program of China [2016YFB0402705]
- Higher Education Commission of Pakistan (HEC)
- National Natural Science Foundation of China [61504084, 11704261, 11575118]
- Natural Science Foundation of SZU [2017067]
- Shenzhen Key Lab Fund [ZDSYS20170228105421966]
- Basical Research Program of Shenzhen [JCYJ20160307144047526]
- PhD Start-up Fund of Natural Science Foundation of Guangdong Province, China [848-0000082109]
In this paper, we reported comparative study of the humidity characteristics of graphene/silver nanoparticles composite (Gr-AgNps) and graphene/silver nanoparticles/PMMA composite (Gr-AgNps-PMMA) based efficient humidity sensors. Aqueous solution of Gr-AgNps and Gr-AgNps-PMMA was drop casted over interdigitated copper electrodes with 50 pin gap embedded in the substrates in dust free environment. The band gap obtained from the IJV-vis spectra for Gr-AgNps and Gr-AgNps-PMMA based humidity sensors was 4.7 and 4.1 eV respectively. The capacitive and resistive humidity response was studied using LCR meter (GW Instek817). Apparent increase in capacitance was observed (100-10,000 nF) with the increase in the humidity percentage (30-95%RH) at lower frequencies for both the sensors. Resistance of the sensors dropped to zero as the humidity level is increased from 30 to 95%RH in the chamber. The devices were tested for real time stability and for fast response/recovery time. Both the devices showed an excellent stability and response by recording their resistance and capacitance respectively. A lagging of RH decreasing response from RH increasing response was observed at 500 Hz frequency for both the sensors depicted from the hysteresis curve. The humidity response of Gr-AgNps was comparatively better than that of the Gr-AgNps-PMMA based humidity sensors. (C) 2018 Elsevier B.V. All rights reserved.
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