Facile Synthesis of Nanocrystal Tin Oxide Hollow Microspheres by Microwave-Assisted Spray Pyrolysis Method

摘要

Tin oxide(SnO_2) hollow microspheres with narrow size distribution were prepared by a facile one-pot microwave-assisted spray pyrolysis method. The effect of temperature on microstructural and optical properties was investigated by X-ray diffraction(XRD), scanning electron microscope(SEM), high resolution transmission electron microscope(HRTEM), and UV-Vis spectrophotometer(UV-Vis), respectively.The SnO_2 particles obtained at and above 700?C are tetragonal rutile structure with high purity and smooth surface morphology, which consist of well-interconnected SnO_2 nanocrystallines and the shell thickness was about 26 nm. UV-Vis absorption values were quite low in visible light region and high in ultraviolet region, indicating the possible utilization for optical purpose of the as-prepared SnO_2. The band gaps were 3.88 and 4.07 e V for SnO_2 synthesized at 700 and 800?C, respectively. As compared to traditional electrical heating or flame modes, microwave heating introduced here demonstrates a highefficiency, environmentally benign, and time-and energy-saving technology to synthesize advanced powders.