Fiber-optic dual Fabry-Pérot interferometric carbon monoxide sensor with polyaniline/Co3O4/graphene oxide sensing membrane

• Published in: Chinese chemical letters Vol. 31; no. 8; pp. 2145 - 2149
• Main Authors: Peng, Jin, Liao, Jie, Yang, Xiaozhan, Feng, Wenlin
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2020; Department of Physics and Energy, Chongqing University of Technology, Chongqing 400054, China%Department of Physics and Energy, Chongqing University of Technology, Chongqing 400054, China; Chongqing Key Laboratory of Green Energy Materials Technology and Systems, Chongqing 400054, China
• Subjects: Carbon monoxide; Dual Fabry-Pérot interferometer; Gas sensor; PANI/Co3O4/GO; Sensing membrane; Dual Fabry-Pérot interferometer; Sensing membrane; Gas sensor; Carbon monoxide; PANI/Co3O4/GO
• ISSN: 1001-8417; 1878-5964
• DOI: 10.1016/j.cclet.2019.11.050

An optical fiber dual Fabry-Pérot interferometric carbon monoxide gas sensor based on PANI/Co3O4/GO (PCG) sensing film coated on the end face of the optical fiber is proposed and fabricated. The sensor has the advantages of small size, light weight, easy preparation, high sensitivity and selectivity, and could be applied for trace detection of CO in toxic environmental monitoring. [Display omitted] An optical fiber dual Fabry-Pérot interferometric carbon monoxide gas sensor based on PANI/Co3O4/GO (PCG) sensing membrane coated on the end face of the optical fiber is proposed and fabricated. One end face of photonic crystal fiber (PCF) without cut-off wavelength is fused with a single-mode fiber (SMF), and the other end face of the PCF is coated with PCG sensing membrane. The collapsed layer formed during the air hole fusion of PCF is used as the first reflector, the interface between PCF and sensing membrane is used as the second reflector, and the interface between the sensing membrane and the air is used as the third reflector, thus the dual Fabry-Pérot structure sensor is formed. The results show that the sensor has excellent sensitivity and selectivity to carbon monoxide. With the increasing concentration of carbon monoxide gas in the range of 0−60 ppm, the intensity of interference spectrum decreases. The sensitivity of the sensor is 0.3473 dB m/ppm, and its linearity is good. The response time and recovery time are 68 s and 106 s, respectively. The sensor has the advantages of the compact size, low cost, high sensitivity, strong selectivity and simple structure. It is suitable for the sensing detection of low concentration carbon monoxide gas.