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<正>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 sensitiv