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Sensors 2006, 6(4), 318-323; doi:10.3390/s6040318

Gas Sensing Properties of Ordered Mesoporous SnO2

1,* , 1, 2 and 2
Received: 30 July 2005 / Accepted: 4 January 2006 / Published: 7 April 2006
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We report on the synthesis and CO gas-sensing properties of mesoporoustin(IV) oxides (SnO2). For the synthesis cetyltrimethylammonium bromide (CTABr) wasused as a structure-directing agent; the resulting SnO2 powders were applied as films tocommercially available sensor substrates by drop coating. Nitrogen physisorption showsspecific surface areas up to 160 m2·g-1 and mean pore diameters of about 4 nm, as verifiedby TEM. The film conductance was measured in dependence on the CO concentration inhumid synthetic air at a constant temperature of 300 °C. The sensors show a high sensitivityat low CO concentrations and turn out to be largely insensitive towards changes in therelative humidity. We compare the materials with commercially available SnO2-basedsensors.
Keywords: Tin oxide; sensing properties; CO; humidity. Tin oxide; sensing properties; CO; humidity.
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Wagner, T.; Kohl, C.-D.; Fröba, M.; Tiemann, M. Gas Sensing Properties of Ordered Mesoporous SnO2. Sensors 2006, 6, 318-323.

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