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http://dx.doi.org/10.3740/MRSK.2016.26.12.741

Excellent Carbon Monoxide Sensing Performance of Au-Decorated SnO2 Nanofibers  

Kim, Jae-Hun (Department of Materials Science and Engineering, Inha University)
Zheng, Yifang (Department of Materials Science and Engineering, Inha University)
Mirzaei, Ali (The Research Institute of Industrial Science, Hanyang University)
Kim, Sang Sub (Department of Materials Science and Engineering, Inha University)
Publication Information
Korean Journal of Materials Research / v.26, no.12, 2016 , pp. 741-750 More about this Journal
Abstract
Nanofibers(NFs), because of their high surface area and nanosized grains, have appropriate morphologies for use in chemiresistive-type sensors for gas detection applications. In this study, a highly sensitive and selective CO gas sensing material based on Au-decorated $SnO_2$ NFs was fabricated by electrospinning. $SnO_2$ NFs were synthesized by electrospinning and subsequently decorated with various amounts of Au nanoparticles(NPs) by sputtering; this was followed by thermal annealing. Different characterizations showed the successful formation of Au-decorated $SnO_2$ NFs. Gas sensing tests were performed on the fabricated sensors, which showed bell-shaped sensing behavior with respect to the amount of Au decoration. The best CO sensing performance, with a response of ~20 for 10 ppm CO, was obtained at an optimized amount of Au (2.6 at.%). The interplay between Au and $SnO_2$ in terms of the electronic and chemical sensitization by Au NPs is responsible for the great improvement in the CO sensing capability of pure $SnO_2$ NFs, suggesting that Au-decorated $SnO_2$ NFs can be a promising material for fabricating highly sensitive and selective chemiresistive-type CO gas sensors.
Keywords
carbon monoxide; Au functionalization; $SnO_2$ nanofiber; electrospinning; gas sensor;
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