Graphene Oxide based Gas Sensor for Triethylamine Detection at Room Temperature. Issue 1 (1st January 2022)

• Record Type: Journal Article
• Authors: Abbas, Haidar; Marappan, Gobinath; Chidabaram,, David; Govindasamy, Shiva; Jayaraman Surya, Velappa; Sivalingam, Yuvaraj
• Is Part Of: IOP conference series. Volume 1219:Issue 1(2022)
• Publication Date: 2022-01-01
• Subjects: Graphene oxide -- Triethylamine -- Gas sensor -- Room temperature -- Fast response time; Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/1219/1/012031
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: We have developed a graphene oxide (GO) based sensor to detect triethylamine at room temperature. GO is synthesized by modified Hummer's method and spin-coated on fluorine-doped tin oxide (FTO) substrate. Structural and morphological characterizations of GO are done by XRD and FE-SEM. Sheet-like morphology of GO is observed in FESEM images. The existence of defects is confirmed by Raman spectra with a ID /IG ratio ∼ 0.94. Gas adsorption studies are carried out using scanning Kelvin probe system with various volatile organic compounds (VOCs) like ethanol, acetone, n-hexane and triethylamine. Among them, GO shows more contact potential difference (CPD) response towards triethylamine. Then, a gas sensor device is fabricated using GO and its electrical characterization is done by I-V measurements. The device shows ohmic behavior with a resistance of ∼ 50 MΩ. Thereafter, the sensor is exposed to triethylamine from 19 to 151 ppm and the sensitivity is 1.39 x 10 −4 ppm −1 . Interestingly, a fast response time of 11 sec is achieved at room temperature.