Optofluidic in-fiber on-line ethanol sensing based on graphene oxide integrated hollow optical fiber with suspended core

• Published in: Optical fiber technology Vol. 58; p. 102250
• Main Authors: Gao, Danheng, Yang, Xinghua, Teng, Pingping, Kong, Depeng, Liu, Zhihai, Yang, Jun, Luo, Meng, Li, Zhanao, Wen, Xingyue, Yuan, Libo, Li, Kang, Copner, Nigel
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.09.2020
• Subjects: Graphene oxide; In-fiber device; Microstructured optical fiber; Optofluidic sensor; Optofluidic sensor; In-fiber device; Graphene oxide; Microstructured optical fiber
• ISSN: 1068-5200; 1095-9912
• DOI: 10.1016/j.yofte.2020.102250

•An in-fiber optofluidic ethanol sensor was fabricated.•Graphene oxide was integrated into the hollow optical fiber with suspended core.•Light intensity can be modulated through the GO on the core in the fiber.•This in-fiber sensor presents high sensitivity of ethanol detection. In this study, a novel in-fiber optofluidic trace ethanol sensor is proposed firstly. The microstructured hollow fiber (MHF) with a suspended core is a key part of the overall device which is integrated with graphene oxide (GO). The GO can be uniformly trapped on the whole surface of the suspended core in the MHF by using evanescent field inducing method. When trace microfluidic ethanol passes through the in-fiber device, the light intensity of the suspended core can be significantly modulated through the interaction between the GO on the core and ethanol. The device presents an excellent linearity on-line response with an average sensitivity of 0.16 dB/% with linear regression equation of y = 0.16x + 25.989. In general, this compact optofluidic in-fiber trace ethanol sensor can be utilized as for on-line detection of trace amounts of ethanol in special environments.