Surface chemistry of nanocrystalline SnO2: Effect of thermal treatment and additives

Highly sensitive thin film NH3 gas sensor operating at room temperature based on SnO2/MWCNTs composite

“…This implies that the response of the composite sensor should be mainly contributed by the MWCNTs, which have been well known to behave as a p-type semiconductor [12][13][14][15][25][26][27][28]. Comparing with the CNTs-based NH 3 sensor [27,29] and the SnO 2 -based NH 3 sensor [29][30][31] reported previously, as-synthesized composites SnO 2 /MWCNTs-based sensors have a higher response to NH 3 gas at room temperature.…”

“…The NH 3 gas sensors based on CNTs [25,26] and SnO 2 [27][28][29][30][31] have been extensively investigated. The SnO 2 -based gas sensors can detect NH 3 gas with good sensitivity and responserecovery time, but it only operates at elevated temperatures.…”

Selectivity Modification of SnO2‐Based Materials for Gas Sensor Arrays

“…From our previous work [13] we expected the growth of sensor signal towards ammonia by the tin oxide modification with the oxides more acidic than SnO 2 (MoO 3 , V 2 O 5 ). It was demonstrated that in the case of NH 3 detection at concentration level of 500 ppm in dry air (RH = 4 %) the sensor signal value is in a good agreement with the density of acid centers from which NH 3 desorption occurs in the temperature range 350-600 8C.…”

Highly sensitive ethanol sensors based on nanocrystalline SnO2 thin films

“…There are two general ways of ethanol conversion [45,46]: dehydration and oxidative dehydrogenation. The first one takes place mainly over the surface with Bronsted acidity and gives a low sensor response.…”