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TeO 2 nanowires were synthesized on Au-coated glass substrates using a thermal evaporation method. Structural characterization showed that TeO 2 nanowires with high surface-to-volume ratio and large mass production had a single-crystal tetragonal structure. A gas sensor based on TeO 2 nanowires showed a quick response-recovery speed and a reversible response to n-propanol gas at low operating temperatures.

The influence of annealing temperature on the microstructure and H 2 sensing properties of Pd-doped SnO 2 sputtered thin films were investigated. The as-deposited film was amorphous and would crystallize to tetragonal SnO 2 structure when the annealing temperature was above 350°C. The films were composed of columnar grains. Both crystallite size and grain size increased with an increase in annealing temperature. H 2 sensing measurements showed that gas sensors based on these films obtained the peak response to 1000 ppm H 2 at an operating temperature of 100°C and showed a good reversibility. The Pd-doped SnO 2 thin film annealed at 450°C showed the highest response to H 2 . The improved gas sensing properties were attributed to the porosity of columnar nanostructures and catalytic activities of Pd doping.