Novel microwave assisted sol-gel synthesis (MW-SGS) and electrochromic performance of petal like h-WO3 thin films

TitleNovel microwave assisted sol-gel synthesis (MW-SGS) and electrochromic performance of petal like h-WO3 thin films
Publication TypeJournal Article
Year of Publication2012
AuthorsKharade, RR, Patil, KR, Patil, PS, Bhosale, PN
JournalMaterials Research Bulletin
Volume47
Issue7
Pagination1787-1793
Date PublishedJUL
ISSN0025-5408
KeywordsChemical synthesis, Electrochemical properties, Oxides, photoelectron spectroscopy
Abstract

Use of domestic microwave oven is first time employed for chemical deposition of nanocrystalline hexagonal WO3 (h-WO3) thin films. Low cost precursors like sodium tungstate, hydrochloric acid, oxalic acid and potassium sulfate signifies cost effectiveness of this thin film fabrication route. Scanning electron microscopy images reveal formation of petal like nanodisks. A number of analytical techniques were used to characterize the WO3 petal like nanodisks, including X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX). X-ray photoelectron spectroscopy, FT-IR spectroscopy, Raman scattering spectroscopy, UV-visible spectrophotometry and cyclic voltammetry (CV). The X-ray photoelectron spectroscopic studies revealed 2.89 O/W atomic ratio. The electrical transport studies on WO3 thin films show semiconducting behavior with n-type semiconductivity. The value of determined coloration efficiency is 57.90 cm(2)/C. The mechanism of Li+ intercalation and deinercalation in h-WO3 matrix is proposed for enhanced electrochromism. (C) 2012 Elsevier Ltd. All rights reserved.

DOI10.1016/j.materresbull.2012.03.025
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

1.913

Divison category: 
Center for Material Characterization (CMC)