| Autor: |
Yao, Kun, Caruntu, Daniela, Cao, Baobao, O’Connor, Charles J., Zhou, Weilie |
| Zdroj: |
IEEE Transactions on Nanotechnology; Sep2010, Vol. 9 Issue 5, p630-633, 4p |
| Abstrakt: |
Two forms of tin oxide (SnO2) nanoparticles (NPs) with different morphologies (small dispersed NPs and big clusters aggregated from small NPs) were synthesized via chemical solution methods and assembled into films on Si/SiO2 substrate for a comparative sensing study, which were tested for the responses to H2 \rm S reducing gas and NO2 oxidizing gas, respectively. Similar detection limits to part per million levels H2 \rm S reducing gas and part per billion (ppb) levels NO2 oxidizing gas were observed for both films with different morphologies at room temperature. It was found, however, that the small NP film showed higher sensitivity and detection limit to H2 \rm S down to ppb levels after surface modification by depositing Au nanocatalysts, while SnO2 big cluster film presented better sensitivity to NO2 detection down to ppb levels with/without the nanocatalyst modification, much determined by the morphology of these two forms of NPs. The sensing mechanism is also discussed. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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