All-optical graphene oxide humidity sensors
Document Type
Article
Publication Date
1-1-2014
Abstract
The optical characteristics of graphene oxide (GO) were explored to design and fabricate a GO-based optical humidity sensor. GO film was coated onto a SU8 polymer channel waveguide using the drop-casting technique. The proposed sensor shows a high TE-mode absorption at 1550 nm. Due to the dependence of the dielectric properties of the GO film on water content, this high TE-mode absorption decreases when the ambient relative humidity increases. The proposed sensor shows a rapid response (<1 s) to periodically interrupted humid air flow. The transmission of the proposed sensor shows a linear response of 0.553 dB/% RH in the range of 60% to 100% RH.
Keywords
Graphene oxide, humidity sensing, optical sensing
Publication Title
Sensors
Volume
14
Issue
12
Publisher
MDPI AG
Publisher Location
POSTFACH, CH-4005 BASEL, SWITZERLAND