Saucer-and Rod-like WO_3 3-D Microstructures：Synthesis,Characterization,and Optical Properties

摘要

Three-dimensional（3-D）saucer-and rod-like WO3 microstructures have been synthesized by a simple hydrothermal route using tartaric acid as the assistant agent.X-ray powder diffraction（XRD）patterns indicate that the as-prepared samples are the pure hexagonal phase WO3.The morphologies are characterized by scanning electron microscope（SEM）and are found to be highly sensitized to the reaction temperature.A probable formation mechanism of the WO3 microstructures from saucer-like at low temperatures to rod-like at high temperatures is proposed.The optical properties of the novel WO3 microstructures are studied by UV-vis diffuse reflectance spectroscopy（DRS）.The mechanism of strong absorption at visible region and red shift of calcined sample is also discussed.