The selective detection of C2H5OH using SnO2–ZnO thin film gas sensors prepared by combinatorial solution deposition

Surface acoustic wave ammonia sensor based on ZnO/SiO2 composite film

“…In recent years, numerous materials including semiconducting oxide materials, such as ZnO [1,2], ZrO 2 [3], CdO [4] and TiO 2 [5], organic compounds [6,7] and novel materials such as carbon nanotubes [8] and graphene [9,10] are exploited for ammonia detection due to their superior ammonia gas sensing properties. Composite system based sensors have been demonstrated good sensitivity and selectivity to a particular gas [11,12] by varying the type and composition of the components of the composite such as metal oxide-metal oxide [1,13], novel materials (carbon nanotube and graphene)-metal oxide [9,14], polymer-metal oxide [8,15] etc. For ammonia gas detection, many efforts have been made to pursue both high response and good selectivity.…”

Advanced ceramics in the SnO2–ZnO binary system

“…Zinc oxide and tin dioxide may be favorably combined to produce SnO 2 -ZnO materials, which show high gas sensing performance and excellent optical properties [12][13][14][15].…”

Gas Sensing Studies of an n-n Hetero-Junction Array Based on SnO2 and ZnO Composites

“…This was the temperature at which the sensors within the array exhibited the optimal response, except for the 100 wt% ZnO and 90 wt% ZnO´10 wt% SnO 2 sensor devices, both of which exhibited optimal performance at a higher temperature of 350˝C. The observed increase in conductive response of all devices against the reducing analyte is inherent to the nature of the n-type conductivity of both SnO 2 and ZnO metal oxides, whose conductive response is seen to increase upon exposure to ethanol [38]. The response behaviour therefore gave evidence that the conductivity within the pure and composite materials occurred via the n-type percolation paths that existed between the ZnO-ZnO and SnO 2 -SnO 2 homo-contacts and the ZnO-SnO 2 hetero-contacts (the latter of which is only attributed to the composite materials).…”