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Synthesis and optical properties of Au decorated colloidal tungsten oxide nanoparticles

Tahmasebi, N ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.apsusc.2015.07.181
  3. Publisher: Elsevier , 2015
  4. Abstract:
  5. In this study, colloidal tungsten oxide nanoparticles were fabricated by pulsed laser ablation of tungsten target using the first harmonic of a Nd:YAG laser (1064 nm) in deionized water. After ablation, a 0.33 g/lit HAuCl4 aqueous solution was added into as-prepared colloidal nanoparticles. In this process, Au3+ ions were reduced to decorate gold metallic state (Au0) onto colloidal tungsten oxide nanoparticles surface. The morphology and chemical composition of the synthesized nanoparticles were studied by AFM, XRD, TEM and XPS techniques. UV-Vis analysis reveals a distinct absorption peak at ∼530 nm. This peak can be attributed to the surface plasmon resonance (SPR) of Au and confirms formation of gold state. Moreover, X-ray photoelectron spectroscopy reveals that Au ions' reduction happens after adding HAuCl4 solution into as-prepared colloidal tungsten oxide nanoparticles. Transmission electron microscope shows that an Au shell has been decorated onto colloidal WO3 nanoparticles. Noble metal decorated tungsten oxide nanostructure could be an excellent candidate for photocatalysis, gas sensing and gasochromic applications. Finally, the gasochromic behavior of the synthesized samples was investigated by H2 and O2 gases bubbling into the produced colloidal Au/WO3 nanoparticles. Synthesized colloidal nanoparticles show excellent coloration contrast (∼80%) through NIR spectra
  6. Keywords:
  7. Au ; Colloidal WO3 nanoparticles ; Pulsed laser ablation ; Ablation ; Colloids ; Deionized water ; Gas sensing electrodes ; Laser ablation ; Metallic compounds ; Nanoparticles ; Nanostructures ; Neodymium lasers ; Optical properties ; Oxides ; Precious metals ; Pulsed lasers ; Solutions ; Surface plasmon resonance ; Synthesis (chemical) ; Transmission electron microscopy ; Tungsten ; Tungsten compounds ; X ray photoelectron spectroscopy ; Absorption peaks ; Chemical compositions ; Colloidal nanoparticles ; First harmonic ; Metallic state ; ND : YAG lasers ; NIR spectrum ; Tungsten oxide ; Gold
  8. Source: Applied Surface Science ; Volume 355 , November , 2015 , Pages 884-890 ; 01694332 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0169433215017481