Please use this identifier to cite or link to this item: http://cmuir.cmu.ac.th/jspui/handle/6653943832/51618
Title: The monitoring of H 2S and SO 2 noxious gases from Industrial environment with sensors based on flame-spray-made SnO 2 nanoparticles
Authors: Chaikarn Liewhiran
Nittaya Tamaekong
Anurat Wisitsora-at
Sukon Phanichphant
Keywords: Engineering
Issue Date: 18-Jul-2012
Abstract: The noxious gas sensors were developed successfully using flame-spray-made SnO 2 nanoparticles as the sensing materials. The functionalized nanoparticle properties were further analyzed by XRD, BET and TEM analyses. The SnO 2 nanoparticles (SSA BET: 141.6 m 2/g) were investigated revealing non-agglomerated spherical, hexagonal, rectangle (3-10 nm), and rod-like (3-5 nm in width and 5-20 nm in length) morphologies. The sensing films were prepared by spin coating onto the Al 2O 3 substrates interdigitated with Au electrodes. The sensing films were significantly developed in order to detect with H 2S (0.5-10 ppm) and SO 2 (20-500 ppm) at the operating temperature ranging from 200-350°C. After sensing test, the cross-section of sensing film was analyzed by SEM analyses. It was found that SnO 2 sensing film showed higher sensitivity to H 2S gas with very fast response at lower concentrations (3s, to 10 ppm). The cross sensitivities of the sensor towards different concentrations of H 2S, CO, H 2, and C 2H 2 were measured at 300°C. The sensor evidently shows much less response to CO, H 2, and C 2H 2 than to H 2S indicating higher selectivity for H 2S of the SnO 2 sensor at the lower concentration (10 ppm). Therefore, the SnO 2 sensor was the most suitable candidate for the efficient detection of H 2S noxious gas.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84863789931&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/51618
ISSN: 01258281
Appears in Collections:CMUL: Journal Articles

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