Enhanced methanol sensing properties of SnO2 microspheres in a composite with Pt nanoparticles

摘要: SnO2 microspheres in a composite with Pt nanoparticles (0, 0.5, 1.5, 2.5, 5.0 mol% loading) were synthesized by solvothermal method. The crystal structure, morphology, and specific surface area thoroughly characterized. It is found that the Pt–SnO2 nanocomposites consist of large amount small spheres average diameters up to hundreds nanometers, every sphere composed numerous primary nanocrystallites an size about 8 nm. Compared pristine SnO2, presence has no influence on growth behavior microspheres. gas sensors based not only show lower operating temperature immensely enhanced responses, but also exhibit faster response recovery speeds remarkable stability methanol, especially nanocomposite. sensor nanocomposite exhibits value 190.88 100 ppm methanol at low 80 °C, while displayed 19.38 200 °C. reasonable explanation gas-sensing performance enhancement for attributed strong spillover effect electronic interaction between microspheres, both which promoted performance.