Electrochromic properties of tungsten oxide films prepared by sparking method using external electric field
| Autor: | T. Kumpika, W. Thongsuwan, Pisith Singjai, Winai Thongpan, P. Pooseekheaw, A. Panthawan, Adisorn Tuantranont, D. Louloudakis, E. Kantarak |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Auxiliary electrode Materials science Annealing (metallurgy) Metals and Alloys Analytical chemistry 02 engineering and technology Surfaces and Interfaces Electrolyte 021001 nanoscience & nanotechnology Tin oxide 01 natural sciences Reference electrode Surfaces Coatings and Films Electronic Optical and Magnetic Materials symbols.namesake Electrochromism 0103 physical sciences Materials Chemistry symbols 0210 nano-technology Raman spectroscopy Monoclinic crystal system |
| Zdroj: | Thin Solid Films. 682:135-141 |
| ISSN: | 0040-6090 |
| Popis: | In this paper, high porous tungsten oxide (WO3) 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 WO3 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 WO3 when the annealing temperature is higher than 300 °C. In addition, the electrochemical analysis was carried out by using a 0.05 M H2SO4 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 cm2/C were achieved for annealed films at 300 °C. |
| Databáze: | OpenAIRE |
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