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Ultrasensitive NO Gas Sensor Based on the Graphene Oxide-Coated Long-Period Fiber Grating
journal contribution
posted on 2019-10-18, 19:43 authored by Bing Xu, Jun Huang, Xiaofeng Xu, Ai Zhou, Liyun DingAn
ultrasensitive nitric oxide (NO) gas sensor based on the graphene
oxide (GO)-coated long-period fiber grating (LPFG) was constructed
successfully because of its excellent sensitivity to the surrounding
refractive index (SRI) change. The surface morphology and structure
of GO coated on LPFG were characterized by the scanning electron microscope
(SEM), scanning probe microscope (SPM), and Raman spectroscopy, respectively.
The adsorption principle of NO molecules by GO was calculated in detail
by density functional theory (DFT) and further characterized by Fourier
transform infrared spectrometry (FT-TR) and X-ray photoelectron spectroscopy
(XPS). Our studies demonstrate that the adsorption principle of NO
molecules by GO was the combined effect of physical adsorption and
chemical adsorption because of the formation of C–N bonds between
GO and NO and the oxidization of NO to NO2. The NO sensor
exhibits excellent sensing performance in the NO concentration range
of 0 to 400 ppm.