Low-temperature carbon monoxide gas sensors based gold/tin dioxide

摘要

Tin dioxide nanocrystals were synthesized by a precipitation process and then used as the support for 2 wt.% gold/tin dioxide preparation via a deposition-precipitation method, followed by calcination at 200℃. Thick films were fabricated from gold/tin dioxide powders, and the sensing behavior for carbon monoxide gas was investigated. The gold/tin dioxide was found to be efficient carbon monoxide gas-sensing materials under low operating temperature (83-210℃). The Au/SnO_2 sensor with SnO_2 calcined at 300℃ exhibited better CO gas-sensing behavior than the SnO_2 calcined at other temperatures. The experimental results indicated the potential use of Au doped SnO_2 for CO gas sensing.