National Engineering Laboratory for Fiber Optic Sensing Technology , Wuhan University of Technology , Wuhan 430070 , China.
ACS Appl Mater Interfaces. 2019 Oct 30;11(43):40868-40874. doi: 10.1021/acsami.9b14212. Epub 2019 Oct 18.
An 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 NO. The NO sensor exhibits excellent sensing performance in the NO concentration range of 0 to 400 ppm.
成功构建了基于氧化石墨烯（GO）涂覆长周期光纤光栅（LPFG）的超灵敏一氧化氮（NO）气体传感器，因为其对周围折射率（SRI）变化具有出色的灵敏度。通过扫描电子显微镜（SEM）、扫描探针显微镜（SPM）和拉曼光谱分别对涂覆在 LPFG 上的 GO 的表面形态和结构进行了表征。通过密度泛函理论（DFT）详细计算了 GO 对 NO 分子的吸附原理，并通过傅里叶变换红外光谱（FT-TR）和 X 射线光电子能谱（XPS）进一步进行了表征。我们的研究表明，由于 GO 与 NO 之间形成了 C-N 键以及 NO 被氧化成 NO，GO 对 NO 分子的吸附原理是物理吸附和化学吸附的共同作用。该 NO 传感器在 0 至 400 ppm 的 NO 浓度范围内表现出优异的传感性能。
