Wu Yu, Yao Baicheng, Zhang Anqi, Rao Yunjiang, Wang Zegao, Cheng Yang, Gong Yuan, Zhang Weili, Chen Yuanfu, Chiang K S
Opt Lett. 2014 Mar 1;39(5):1235-7. doi: 10.1364/OL.39.001235.
A graphene coated microfiber Bragg grating (GMFBG) for gas sensing is reported in this Letter. Taking advantage of the surface field enhancement and gas absorption of a GMFBG, we demonstrate an ultrasensitive approach to detect the concentration of chemical gas. The obtained sensitivities are 0.2 and 0.5 ppm for NH3 and xylene gas, respectively, which are tens of times higher than that of a GMFBG without graphene for tiny gas concentration change detection. Experimental results indicate that the GMFBG-based NH3 gas sensor has fast response due to its highly compact structure. Such a miniature fiber-optic element may find applications in high sensitivity gas sensing and trace analysis.
本文报道了一种用于气体传感的石墨烯包覆微光纤布拉格光栅（GMFBG）。利用GMFBG的表面场增强和气体吸收特性，我们展示了一种超灵敏的方法来检测化学气体的浓度。对于氨气和二甲苯气体，获得的灵敏度分别为0.2 ppm和0.5 ppm，这比没有石墨烯的GMFBG对于微小气体浓度变化检测的灵敏度高出几十倍。实验结果表明，基于GMFBG的氨气气体传感器由于其高度紧凑的结构而具有快速响应。这种微型光纤元件可能在高灵敏度气体传感和痕量分析中找到应用。
