Open AccessGraphene Oxide based Gas Sensor for Triethylamine Detection at Room Temperature
Author(s) -
Haidar Abbas,
Gobinath Marappan,
David Chidabaram,
S. Govindasamy,
Velappa Jayaraman Surya,
Yuvaraj Sivalingam
Publication year - 2022
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1219/1/012031
Subject(s) - triethylamine , materials science , raman spectroscopy , oxide , tin oxide , graphene , analytical chemistry (journal) , acetone , ohmic contact , spin coating , substrate (aquarium) , chemical engineering , nanotechnology , chemistry , thin film , organic chemistry , optics , metallurgy , physics , engineering , layer (electronics) , oceanography , geology
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 I D /I G 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.