Facile Synthesis and Acetone Sensing Performance of Hierarchical SnO 2 Hollow Microspheres with Controllable Size and Shell Thickness

A facile method to prepare SnO 2 hollow microspheres has been developed by using SiO 2 microspheres as template and Na 2 SnO 3 as tin resource. The obtained SnO 2 hollow microspheres were characterized by X-ray diffraction, scanning electron microscopy, high resolution and transmission electron microscopy, and Brunauer–Emmett–Teller analysis, and their sensing performance was also investigated. It was found that the diameter of SnO 2 hollow microspheres can be easily controlled in the range of 200–700 nm, and the shell thickness can be tuned from 7.65 to 30.33 nm. The sensing tests showed that SnO 2 hollow microspheres not only have high sensing response and excellent selectivity to acetone, but also exhibit low operating temperature and rapid response and recovery due to the small crystal size and thin shell structure of the hollow microspheres, which facilitate the adsorption, diffusion, and reaction of gases on the surface of SnO 2 nanoparticles. Therefore, the SnO 2 hollow microsphere is a promising material for the preparation of high-performance gas sensors.