bstract：In order to improve SnO₂sensing alility,Macroporous SnO₂were prepared via template method by utilizing polystyrene( PS) microspheres as a template and SnO₂nanocrystals as a framework. The as-prepared samples were characterized by differential thermal annalysis( TG-DTA),scanning electron microscope( SEM),transmission electron microscope( TEM),X-ray diffraction( XRD),and the Nitrogen adsorption-desorption analyses. The as-prepared sample possesses interconnected macropores with the average macropore size of 300 nm. The Nitrogen adsorption-desorption analysis showed that the MP-SnO₂have a higher specific surface area comparing with SnO₂nanopariticels. The response of MP-SnO₂is as high as 138 at 280 ℃ towards 4 ×10-4ethanol vapor,which is 1. 6 times higher than the SnO₂nanoparticles.

Keyword：SnO2 nanomaterial;gas-sensing materials;PS microspheres;granularity template method;