Abstract
SnO2 porous spheres were synthesized by spray drying using glucose as a pore -forming agent. Au nanoparticles used as sensitizers were synthesized on the surface of SnO2 porous spheres to improve the gas sensing property of the spheres. The products were characterized by powder X-ray diffraction, high -resolution scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption/desorption measurement. Results show that the surface area and pore size of the Au-loaded SnO2 spheres were 31.3 m2/g and 61.7 nm, respectively. The crystallite SnO2 and Au nanoparticle measured 11 and 5 nm, respectively, and the Au nanoparticles were homogeneously deposited on the surface of SnO2. The gas sensing performance of Au-loaded SnO2 porous spheres was measured. Results show that the gas sensitivity and selectivity of Au-loaded SnO2 porous spheres were improved.
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