| Autor: |
Gaik Tin Ang1, Geik Hoon Toh1, Abu Bakar, Mohamad Zailani1 chmohdz@eng.usm.my, Abdullah, Ahmad Zuhairi1, Othman, Mohd Roslee1 |
| Předmět: |
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| Zdroj: |
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B. May2011, Vol. 89 Issue 3, p186-192. 7p. |
| Abstrakt: |
The characteristic and effectiveness of pure and modified tin dioxide catalytic pellets as volatile organic compound sensors are discussed. The pure and La-doped SnO2 thick film sensor pellets exhibited highest sensitivity to ethanol, methanol and acetone vapour at sensing temperature 300°C. The highest sensitivity towards 500 ppm of ethanol, acetone and methanol was achieved by 5 at.% of La-doped SnO2 with values of ~57, ~55 and ~59, respectively. The enhancement of the sensitivity of La-doped SnO2 can be explained by the increase of surface areas; decrease of crystallites sizes and the basicity of the lanthanum dopants. The response times for the developed sensors were about 13-15 s for both pure SnO2 and La-doped SnO2 illustrated a fast response sensor that could be used as VOC sensors. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
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