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SnO_2 nanpowder was prepared by sol-gel method.The SnO_2 based formaldehyde sensor with the doping of La_2O_3 (5wt%)-ZnO(3wt%) was fabricated.The range of the detecting concentration for formaldehyde is from 10μg/g to 300μg/g at 140℃.The sensitivity (S=R_0/R_g) to 10μg/g formaldehyde is 2 and to 300μg/g formaldehyde is 16.The 0.4 nm molecule-sifter layer was coated on the surface of SnO_2 material,the result shows that the selectivity of the formaldehyde sensor is improved. The La_2O_3-ZnO doped SnO_2 sensor shows better stability during 60 days testing.
The SnO 2 nanowire was prepared by sol-gel method. The SnO 2 based formaldehyde sensor with the doping of La 2 O 3 (5 wt%) - ZnO (3 wt%) was fabricated. The range of the detecting concentration for formaldehyde is from 10 μg / g to 300 μg / g at 140 ° C. The sensitivity (S = R_0 / R_g) to 10 μg / g formaldehyde is 2 and to 300 μg / g formaldehyde is 16. The 0.4 nm molecule-sifter layer was coated on the surface of SnO 2 material, the result shows that the The La 2 O 3-ZnO doped SnO 2 sensor shows better stability during 60 days testing.