Investigation of the properties of flexible humidity sensor based on reduced graphene oxide by laser irradiation

Abstract

In this paper, we report fabrication and study of humidity sensors based on graphene oxide by laser reduction with 435 nm and 788 nm wavelengths lasers. Working humidity sensor element had a comb structure and was the same for both types of laser exposure. It was discovered that resistance depending on the relative humidity of the obtained structures had different behavior. For structures made by a 435 nm wavelength laser, the resistance decreases with increasing humidity, whereas the resistance for structures created by laser with a 788 nm wavelength the opposite behavior is occurred. To study the effect of humidity, two types of samples were made, an open type, and also with an additional layer of GO, which was applied to protect structure of the sensor.