Abstract
Mesoporous Sn0.9Ti0.1O2 was prepared by controlled hydrolysis of chlorides and subsequent removal of templates by calcination in air. X-ray diffraction, SEM and nitrogen adsorption–desorption results showed that the mesoporous Sn0.9Ti0.1O2 consisted of nanocrystals with the average size of 10nm. The special surface area and average pore size were 70m2/g and 9nm, respectively, for the mesoporous Sn0.9Ti0.1O2. The film sensors based on the Sn0.9Ti0.1O2 exhibited abnormal photoelectrical properties. The photocurrent of the sensor decreased with increasing UV light intensity in air, but increased with increasing UV light intensity in vacuum. The gas response of the Sn0.9Ti0.1O2 sensor to 1000ppm ethanol was about 8.2 under UV light at room temperature. The conductance mechanism and gas sensing mechanism of the mesoporous nanostructure oxides was discussed.
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