Synthesis and Gas-sensing Properties of Flower-like SnO_2 Architectures

摘要

Flower-like SnO_2 architectures constructed of one-dimensional tetragonal prism nanorods were synthesized by a simple hydrothermal method using ethanol as dispersant agent. The morphology and structure of crystals were characterized by field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The results revealed that the SnO_2 nanorods exhibited a single crystalline rutile structure with aspect ratio of nearly 20, and lattice fringes of (1 0 1) plane was 0.263 nm. The heat treatment experiments confirmed the appropriate calcination condition for as-synthesized SnO_2 precursors was 400°C for 1 h. Sensor based on the flower-like SnO_2 architectures exhibited the highest sensitivity of 205 to 40 ppm of CO at optimal operating temperature of 200°C, which makes it a satisfactory candidate for application in practical detecting of CO.