Abstract
The effect of Ag decoration on the gas sensing characteristics of SnO 2 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 C2H 5OH 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.
Original language | English |
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Pages (from-to) | 3140-3145 |
Number of pages | 6 |
Journal | ACS Applied Materials and Interfaces |
Volume | 3 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2011 Aug 24 |
Keywords
- Ag catalyst
- SnOnanowires
- electronic sensitization
- gas sensor
ASJC Scopus subject areas
- Materials Science(all)