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- W1963832626 abstract "Abstract Nanocomposites of TiO 2 /SnO 2 for hydrogen detection have been prepared by mechanical mixing of TiO 2 and SnO 2 nanopowders with different specific surface area SSA = 150.9 m 2 /g (TiO 2 ) and SSA = 18.3 m 2 /g (SnO 2 ). Nanocomposites consist of two distinct components: larger – grain (21–28 nm) cassiterite SnO 2 and smaller – grain (8–11 nm) rutile TiO 2 as indicated by X-ray diffraction measurements and transmission electron microscope, TEM, images. Nanopowders of 50 mol% TiO 2 /50 mol% SnO 2 are composed of small, elongated TiO 2 forms mixed with larger SnO 2 grains of regular shape as demonstrated by TEM. Scanning electron microscopy, SEM of gas sensing tablets, prepared by pressing nanopowders under 25 MPa at 400 °C reveal a high degree of agglomeration. Sensor responses in the electrical resistivity over a wide range of concentrations from 50 to 3000 ppm H 2 at a constant temperature chosen within the interval 250–400 °C have been measured and analyzed before and after sample conditioning at 500 °C in Ar + 7% H 2 atmosphere. Sensing tablets of 50 mol% TiO 2 /50 mol% SnO 2 display the highest sensitivity to hydrogen at moderate temperatures of 250–300 °C. Kinetics of the sensor responses are improved and the recovery time is significantly reduced as a result of annealing in the reducing atmosphere." @default.
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- W1963832626 date "2013-10-01" @default.
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- W1963832626 title "Gas sensing properties of TiO2–SnO2 nanomaterials" @default.
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- W1963832626 doi "https://doi.org/10.1016/j.snb.2013.01.047" @default.
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