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Title: Electrochromic properties of tungsten oxide films prepared by sparking method using external electric field
Authors: W. Thongpan
D. Louloudakis
P. Pooseekheaw
T. Kumpika
E. Kantarak
A. Panthawan
A. Tuantranont
W. Thongsuwan
P. Singjai
Keywords: Materials Science
Physics and Astronomy
Issue Date: 31-Jul-2019
Abstract: © 2019 Elsevier B.V. In this paper, high porous tungsten oxide (WO 3 )films were prepared onto indium-doped tin oxide glass substrates by a sparking method, which is a simple and cost-effective technique. An external electric field of 6 kV/cm was applied to the sparking system in order to increase a dense surface morphology and the deposition rate of the films. In experiments, the films were deposited for 20 min at room temperature and post-annealed from 200 to 500 °C for 1 h under atmospheric pressure. High porosity of the WO 3 films was fabricated by the sparking method and confirmed by scanning with electron microscopy. Raman spectra and X-ray diffraction patterns show the monoclinic phase of WO 3 when the annealing temperature is higher than 300 °C. In addition, the electrochemical analysis was carried out by using a 0.05 M H 2 SO 4 electrolyte solution, Pt as a counter electrode, and Ag/AgCl as a reference electrode. The fast switching speeds of 1.2 s and 2.6 s (for the coloration and bleaching state respectively), optical modulation of 16.3%, and coloration efficiency of 49.6 cm 2 /C were achieved for annealed films at 300 °C.
ISSN: 00406090
Appears in Collections:CMUL: Journal Articles

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