All-Optical Graphene Oxide Humidity Sensors

作者：Lim Weng Hong; Yap Yuen Kiat; Chong Wu Yi^*; Ahmad Harith

来源：Sensors (Switzerland), 2014, 14(12): 24329-24337.

DOI：10.3390/s141224329

• graphene oxide
• humidity sensing
• optical sensing

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 (%26lt;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.

• 出版日期2014-12