Facile Control of C2H5OH Sensing Characteristics by Decorating Discrete Ag Nanoclusters on SnO2 Nanowire Networks

The effect of Ag decoration on the gas sensing characteristics of SnO2 nanowire (NW) networks was investigated. The Ag layers with thicknesses of 5–50 nm were uniformly coated on the surface of SnO2 NWs via e-beam evaporation, which were converted into isolated or continuous configurations of Ag isl...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2011-08, Vol.3 (8), p.3140-3145
Main Authors: Hwang, In-Sung, Choi, Joong-Ki, Woo, Hyung-Sik, Kim, Sun-Jung, Jung, Se-Yeon, Seong, Tae-Yeon, Kim, Il-Doo, Lee, Jong-Heun
Format: Article
Language:English
Subjects:
Catalysis
Electrochemical Techniques - methods
Ethanol - analysis
Gases - chemistry
Metal Nanoparticles - chemistry
Metal Nanoparticles - ultrastructure
Nanowires - chemistry
Nanowires - ultrastructure
Silver - chemistry
Temperature
Tin Compounds - chemistry
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Summary:The effect of Ag decoration on the gas sensing characteristics of SnO2 nanowire (NW) networks was investigated. The Ag layers with thicknesses of 5–50 nm were uniformly coated on the surface of SnO2 NWs via e-beam evaporation, which were converted into isolated or continuous configurations of Ag islands by heat treatment at 450 °C for 2 h. The SnO2 NWs decorated by isolated Ag nano-islands displayed a 3.7-fold enhancement in gas response to 100 ppm C2H5OH at 450 °C compared to pristine SnO2 NWs. In contrast, as the Ag decoration layers became continuous, the response to C2H5OH decreased significantly. The enhancement and deterioration of the C2H5OH sensing characteristics by the introduction of the Ag decoration layer were strongly governed by the morphological configurations of the Ag catalysts on SnO2 NWs and their sensitization mechanism.
ISSN:1944-8244
1944-8252
DOI:10.1021/am200647f