In order to improve the performance of gas sensors

mesoporous SnO2 is prepared using sol-gel method

and its gas sensing properties are also studied.The results indicate that mesoporous SnO2 gas sensor has better responses to ethanol and xylol and greatly enhance the response to toluene at 100

1

50 ℃

compared with nano-SnO2.The mesoporous SnO2 sensors show far better ethanol selectivity than nano-SnO2 when the interferential gases are toluene and xylol at 100

1

50 ℃.Superior toluene selectivity of mesoporous SnO2 sensors are exhibited when toluene as interferential gas at 100

150

350 ℃.The response time of mesoporous SnO2 sensor is short but recovery time is relatively long.