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Wednesday, 19 December 2012 09:08 |
New papers: Applied Physics Letters,101 (2012) 253106
Nguyen Van Hieu*, Phung Thi Hong
Van, Le Tien Nhan, Nguyen Van Duy, Nguyen Duc Hoa, “Giant enhancement of H2S gas response by decorating n-type
SnO2 nanowires with p-type NiO nanoparticles”, Applied Physics
Letters,101 (2012) 253106
Abstract:Metal oxide nanowires (NWs) are widely considered as
promising materials for gas sensor applications. Here, we demonstrate that by
decorating NiO nanoparticles on SnO2 NWs, the gas response to
10 ppm H2S increased up to ~351-fold. The response of the
NiO-decorated SnO2 NWs sensor to 10 ppm H2S at
300 °C reached ~1372, whereas the cross-gas responses to 5 ppm NH3,
200 ppm C2H5OH, and 1 ppm NO2 were
negligible (1.8 to
2.9). The enhanced H2S sensing performance was attributed by the
catalytic effect of NiO and the formation of a continuous chain of n-p-n-p
junctions.
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