title: Reduced graphene oxide for fiber-optic humidity sensing.
abstract: Graphene-based electrical chemical vapor sensors can achieve extremely high sensitivity, whereas the comparatively slow sensing response and recovery, the research focused on only low concentration detection, have been known as drawbacks for many applications requiring rapid and high concentration detection. Here we report a novel graphene-based fiber-optic relative humidity (RH) sensor relying on fundamentally different sensing mechanism. The sensor can achieve power variation of up to 6.9 dB in high relative humidity range (70-95%), and display linear response with correlation coefficient of 98.2%, sensitivity of 0.31 dB/%RH, response speed of faster than 0.13%RH/s, and good repeatability in 75-95%RH. Theoretical analysis of sensing mechanism can explain the experimental result, and reveal the broad applying prospect of the sensor for other kinds of chemical vapor detection. This novel graphene-based optical sensor provides a beneficial complement to the existing electrical ones, and will promote the employment of graphene in chemical sensing techniques.
authors.forename: Yi
authors.initials: Y
authors.lastname: Xiao
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.forename: Xiang
authors.initials: X
authors.lastname: Cai
authors.forename: Shaozao
authors.initials: S
authors.lastname: Tan
authors.forename: Jianhui
authors.initials: J
authors.lastname: Yu
authors.forename: Huihui
authors.initials: H
authors.lastname: Lu
authors.forename: Yunhan
authors.initials: Y
authors.lastname: Luo
authors.forename: Guozhen
authors.initials: G
authors.lastname: Liao
authors.forename: Shiping
authors.initials: S
authors.lastname: Li
authors.forename: Jieyuan
authors.initials: J
authors.lastname: Tang
authors.forename: Zhe
authors.initials: Z
authors.lastname: Chen