All-optical graphene oxide humidity sensors

Weng Hong Lim, Yuen Kiat Yap, Wu Yi Chong*, Harith Ahmad

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    61 Citations (Scopus)


    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.

    Original languageEnglish
    Pages (from-to)24329-24337
    Number of pages9
    Issue number12
    Publication statusPublished - 17 Dec 2014


    • Graphene oxide
    • Humidity sensing
    • Optical sensing

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Biochemistry
    • Atomic and Molecular Physics, and Optics
    • Instrumentation
    • Electrical and Electronic Engineering


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