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Sensors 2014, 14(12), 24329-24337;

All-Optical Graphene Oxide Humidity Sensors

Photonics Research Centre, University of Malaya, Kuala Lumpur 50603, Malaysia
Department of Physics, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
Centre for Foundation Studies, SEGi University, Kota Damansara 47810, Selangor, Malaysia
Author to whom correspondence should be addressed.
Received: 5 November 2014 / Revised: 4 December 2014 / Accepted: 8 December 2014 / Published: 17 December 2014
(This article belongs to the Special Issue Optical Sensors for Chemical, Biological and Industrial Applications)
PDF [1392 KB, uploaded 17 December 2014]


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. View Full-Text
Keywords: graphene oxide; humidity sensing; optical sensing graphene oxide; humidity sensing; optical sensing
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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MDPI and ACS Style

Lim, W.H.; Yap, Y.K.; Chong, W.Y.; Ahmad, H. All-Optical Graphene Oxide Humidity Sensors. Sensors 2014, 14, 24329-24337.

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