Kinetic analysis of low concentration CO detection by Au-loaded cerium oxide sensors

Owing to its high toxicity, even at very low concentration, early detection of carbon monoxide (CO) is imperative. We have fabricated sensors comprising gold nanoparticle-loaded cerium oxide (Au-CeO 2 ). The morphology and elemental composition of the sensing material have been characterized using X...

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Bibliographic Details
Published in:RSC advances 2016-01, Vol.6 (95), p.92989-92995
Main Authors: Majumder, Deblina, Datta, Aparna, Mitra, Manoj Kumar, Roy, Somenath
Format: Article
Language:English
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Summary:Owing to its high toxicity, even at very low concentration, early detection of carbon monoxide (CO) is imperative. We have fabricated sensors comprising gold nanoparticle-loaded cerium oxide (Au-CeO 2 ). The morphology and elemental composition of the sensing material have been characterized using XRD, FESEM, TEM and XPS. The performance of the Au-CeO 2 sensors has been studied for the detection of CO in the concentration range of 10-30 ppm in air. The response and recovery transients of conductance have been modeled using two-site Langmuir adsorption kinetics. In the presence of 30 ppm CO, the calculated response times for two energetically different adsorption sites, CeO 2 surface and Au/CeO 2 interface are 9 s and 7 s, respectively. Finally, an exponential correlation between the gas concentration and the time constants has been derived. Gold nanoparticle-loaded cerium oxide sensors detect 10-30 ppm of carbon monoxide in air with very fast response. The response and recovery transients of conductance have been modelled using two-site Langmuir adsorption kinetics.
ISSN:2046-2069
2046-2069
DOI:10.1039/c6ra18547a