Nano-sized WO3 Structures via Novel Chemical Approach: Temperature Influence

Abstract

Tungsten trioxide (WO₃) has attracted considerable attention due to its promising and remarkable properties. In this study, tungsten carbide (WC) was used as starting material for WO₃ nanostructures preparation. The obtained samples were annealed at different temperatures and were characterized by different techniques to confirm the transformation of WC to WO₃ and to investigate the temperature effect on these nanostructures. The X-ray diffraction (XRD) pattern revealed that the prepared WO₃ nanostructures crystallized into a monoclinic phase after annealing at 500 and 600°C for 5 h in air atmosphere. The Scanning electron microscopy (SEM) images highlighted the temperature effect on the nanostructures morphologies. After annealing at 500°C the nanostructures have a rods-like shape with uniform distribution. However, under 600°C SEM image indicates the exceptional porous morphology, which consisted of hollow sphere-like shape. Fourier transform infrared (FTIR) spectroscopy confirmed the structural composition and the purity of the formed WO₃. The experimental results proved that our simple approach offers a promising route to prepare WO₃ nanostructures as high-performance materials for advanced applications.