Selective detection of CO and CH4 with gas sensors using SnO2 doped with palladium

Organically hybridized SnO2 gas sensors

“…Many efforts have been paid for improving selectivity, a measure of the ability to respond to one specific gas in the presence of others. The addition of small amount of noble metals [2][3][4] and other oxides [5][6][7] are recognized to be effective to improve the selectivity. Surface chemical modification is another way to improve the gas sensing properties [8][9][10].…”

Sensing properties of Au-loaded SnO2–Co3O4 composites to CO and H2

“…In an approach to innovate SnO 2 -based gas sensors, we have been investigating the sensing properties of SnO 2 -Co 3 O 4 composites to CO and H 2 . Compared with noble metal like Pd and Pt, which have popularly been added to semiconductor gas sensors as sensitizers [4][5][6], base transition metals (or oxides) including Co have scarcely been studied well for sensitizing properties, although CuO-loaded SnO 2 [7] and Co 3 O 4 -loaded In 2 O 3 [8] have been reported to show fairly excellent sensing properties to H 2 S and CO, respectively. As reported previously, the composite systems of SnO 2 (n-type semiconductor) and Co 3 O 4 (p-type) showed remarkable gas sensing characteristics depending on their compositions.…”

Laminating two-layer thick films structure tin oxide-based butane gas sensor operating at low temperature

“…Several designs of sensors' construction, SnO 2 -based, were proposed for achieving the selectivity, sensitivity and stability of combustion gas detection with respect to ethanol vapour such as directly doping of small amounts of noble metals (Pd, Pt, Rh and Ru) into SnO 2 [3][4][5][6][7][8][9][10][11][12][13], a suitable filter containing noble metal catalysts method [14][15][16] and a directly coating selective thin film on the surface of SnO 2 layer structure [17,18].…”