Preparation and Characterization of Tungsten Trioxide Nanoplates by Low Cost Acid Treatment Method.

Tungsten trioxide (WO₃) nanoplates were grown employing a low cost acid treatment method. Firstly, the tungsten oxide hydrate (WO₃⋅H2_O) nanoplates were grown on silicon wafer and glass slide substrate at different HNO₃ temperature from 60 to 90°C. The as prepared were the tungsten oxide hydrate (WO₃⋅H2_O), then transformed into monoclinic WO₃nanoplate after annealed at 400 °C at air ambient for 2 hour. The aim of this study was determined the optimum HNO3 temperature in grown WO₃nanoplates. The structure and morphology of WO₃nanoplate were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The optical property was determined by UV-Vis spectrophotometer. The result indicated that morphologies was strongly related to the grown temperature and will discuss in this paper. The relationship between morphologies and optical reflection will be discussed. [ABSTRACT FROM AUTHOR]