High-sensitive humidity sensor based on graphene oxide with evenly dispersed multiwalled carbon nanotubes

Abstract

Using graphene oxide (GO) as a dispersant for multiwalled carbon nanotubes (MWCNTs), a high-sensitive humidity sensor based on GO film with evenly dispersed MWCNTs on Au interdigitated electrodes (IDEs) is presented in this paper. The sensitivity of the sensor with GO/MWCNT film is thirteen times more than that of the sensor with GO film. Scanning electron microscopic characterizations confirm the presence of GO/MWCNT with the less stacking layers compared with GO. This may be attributed to the addition of MWCNTs which plays a supporting role in the GO/MWCNT composite material. This structure would lead to bigger accessible surface area of the composite material and accelerate the diffusion of the water molecules. This study demonstrates that the GO/MWCNT composite could be used for high-sensitive humidity detection.