All-Optical Graphene Oxide Humidity Sensors

Sensors

Weng Hong Lim¹  Yuen Kiat Yap¹  Wu Yi Chong¹ 

[1] Photonics Research Centre, University of Malaya, Kuala Lumpur 50603, Malaysia; E-Mails:

关键词: graphene oxide;    humidity sensing;    optical sensing;   

DOI  :  10.3390/s141224329

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.