Abstract
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.
Highlights
IntroductionAside from the basic needs of high sensitivity and wide detection range additional demands for fast response and short recovery time exist for humidity sensors to meet industry requirements
Aside from the basic needs of high sensitivity and wide detection range additional demands for fast response and short recovery time exist for humidity sensors to meet industry requirements.research on humidity-sensitive nanomaterials such as silicon nanostructures, ceramic nanomaterials, semiconductor nanoparticles and metal oxide nanowires have attracted much attention due to its high surface to volume ratio [1,2]
graphene oxide (GO) has many oxygen functional groups bonded in its two-dimensional network of sp2 and sp3 hybridized carbon atoms arranged in a honeycomb structure
Summary
Aside from the basic needs of high sensitivity and wide detection range additional demands for fast response and short recovery time exist for humidity sensors to meet industry requirements. GO has many oxygen functional groups bonded in its two-dimensional network of sp and sp hybridized carbon atoms arranged in a honeycomb structure. These functional groups include hydroxyl, epoxy and carboxylic acid moieties [1,3]. During the past five years, many research journals have reported on the favorable properties of GO in various sensing applications with different designs such as direct measurement of capacitance between two parallel plates or in a slightly more complex CMOS architecture where the GO acts as insulating layers in the capacitor [1,3,4,5,6,15,16,17,18]. In this work we explore the application of GO in optical sensing by studying the characteristics of its optical response to relative humidity changes
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