Journal
SENSORS
Volume 14, Issue 12, Pages 24329-24337Publisher
MDPI AG
DOI: 10.3390/s141224329
Keywords
graphene oxide; humidity sensing; optical sensing
Funding
- University of Malaya High Impact Research Grant [UM.C/625/1/HIR/MOHE/SCI/29/01]
- UM Grant [RU002/2013, RP019-2012B]
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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.
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