Hydrothermal preparation of nanoflower/rod-like SnO₂ and its gas sensing properties

A novel nanoflower/rod-like hierarchical SnO2 was prepared one step on FTO conductive glass which has SnO2 seed crystal under hydrothermal condition at 200 ℃ with SnCl4 and NaOH as raw materials. The morphology, crystal phase composition and gas-sensing performance of the product were tested by SEM, XRD, N2 adsorption-desorption and gas-sensing tester. The results indicate that the product is tetragonal phase, and "nano carpet" is formed by nanorod arrays which are perpendicular to the base in the hierarchical SnO2 and with spherical nanoflowers growing on it, and the nanorods and petals are all assembled by fuzzy fibers; its specific surface area is 109.8 m2·g-1 which is 13 times than that of the ordinary precipitated SnO2 powder. The product has high gas sensitivity which is 36.1 to 1000×10-6 acetone, 7.9 times of the ordinary precipitated SnO2 powder