Formation of nanoscale tungsten oxide structures and colouration characteristics

Vijay Bhooshan Kumar, Dambarudhar Mohanta

Research output: Contribution to journalArticlepeer-review

89 Scopus citations

Abstract

In this work, pH dependent evolution of tungsten oxide (WO3) nanostructures is being reported along with physical characteristics. The synthesis was carried out via an inexpensive solvothermal cum chemical reduction route, with sodium tungstate (Na2WO4) and cetyl trimethyl ammonium bromide (C19H42NBr) as main reactants. The X-ray diffraction, together with transmission electron microscopic studies have revealed formation of regular polyhedral nanocrystalline structures and fractals as one goes from higher pH (= 5.5) to lower pH (= 2) values. The average crystallite size, as calculated throughWilliamson-Hall plots, was varied within 2.8-6.8 nm for different pH samples. Fourier transform infrared spectroscopy reveals in-plane bending vibration δ (W-OH), observable at ~1630 cm -1 and strong stretching ν (W-O-W) located at ~814 cm -1. Raman spectroscopy has divulged WO3 Raman active optical phonon modes positioned at ~717 and 805 cm-1. The thermochromic and photochromic properties of the nanoscale WO3 sample prepared at pH = 5.5, are also highlighted.

Original languageEnglish
Pages (from-to)435-442
Number of pages8
JournalBulletin of Materials Science
Volume34
Issue number3
DOIs
StatePublished - Jun 2011
Externally publishedYes

Keywords

  • Nanoparticles
  • Photochromic
  • Thermochromic
  • Tungsten oxide

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