Numerical Study of a Capacitive Graphene Oxide Humidity Sensor with Etched Configuration

Fourth Author's Department

Mechanical Engineering Department

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https://doi.org/10.1021/acsomega.1c04242

Document Type

Research Article

Publication Title

ACS Omega

Publication Date

11-9-2021

doi

10.1021/acsomega.1c04242

Abstract

The geometrical dependence of humidity sensors on sensing performance has not been quantitatively outlined. Furthermore, the etching effect on humidity sensors is still elusive due to the difficulty in separating the effects of the geometrical change and etching-induced porosity on the overall performance. Here, we use COMSOL Multiphysics to perform a numerical study of a capacitive graphene oxide (GO) humidity sensor, with emphasis on the dimensions and etching effect on their sensing performance. GO is a useful and promising material in detecting humidity because of its selective superpermeability to water molecules. The mechanism of improved sensing performance of the etched humidity sensors is discussed in terms of the morphological profile and the effective permittivity including the etching-induced porosity effect. Our study shows that as compared to the unetched sensors, isotropic etching achieves the lowest response time of 1.011 s at 15.75% porosity, while vertical etching achieves the highest capacitance sensitivity of 0.106 fF/RH %.

First Page

29781

Last Page

29787

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