Abstract
In this work, synthesis of WO3 nanoparticles is reported using a novel, yet simplified microwave-metal discharge approach. The discharge was triggered from the pointed tip of a tungsten electrode, which eventually got vaporized and deposited on the collector substrates surrounding the metallic electrode. The buildup of high electric field at the tip of the tungsten electrode ionized the surrounding air molecules that lead to the discharge formation. X-Ray diffraction revealed monoclinic phase of the synthesized WO3 nanoparticles. The morphological analysis executed using transmission electron microscopy showed the presence of single crystalline nanoparticles in spherical, rhombic, and rectangular shapes. X-ray photoelectron spectroscopy confirmed the elemental composition and showed formation of stoichiometric WO3. Thermal stability analysis showed high stability of the nanoparticles below 1200 °C. The nitrogen absorption-desorption studies suggested that the nanoparticles exhibited a mesoporous structure. The antimicrobial susceptibility tests indicated an increased resistance towards Gram-negative bacteria (E. coli) compared to Gram-positive bacteria (S. aureus).
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