Correlation Between Electrochromism and Electronic Structures of Tungsten Oxide Films

doi:10.1039/C3RA45421E

機構典藏 > College of Sciences > Graduate Institute & Department of Physics > Journal Article > Item 987654321/97409

Please use this identifier to cite or link to this item: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/97409

Title:	Correlation Between Electrochromism and Electronic Structures of Tungsten Oxide Films
Authors:	Mukta V. Limaye;Chen, J.S.;Singh, Shashi B.;Shao, Y.C.;Wang, Y.F.;Pao, C.W.;Tsai, H.M.;Lee, J.F.;Lin, H.J.;Chiou, J.W.;Yang, M.C.;Wu, W.T.;Chen, J.S.;Wu, J.J.;Tsai, M.H.;Pong, W.F.
Contributors:	淡江大學物理學系
Date:	2014
Issue Date:	2014-03-19 17:07:35 (UTC+8)
Publisher:	Cambridge: R S C Publications
Abstract:	The in-situ X-ray absorption spectroscopy of three tungsten oxide films was performed to study the electronic and atomic structures following repeated cycles of coloration and bleaching processes. The transparent tungsten oxide films become deep blue upon intercalation of Li+ ions in the WO6 octahedra when an external electrical bias was applied. These films reverted to transparent when a reverse external electrical bias was applied. W L3-edge X-ray absorption near-edge structure (XANES) measurements of the nanocrystalline and crystalline tungsten oxide films revealed that the intensity of the white-line feature decreases after coloration and recoverably increases after bleaching owing to the filling and unfilling of the W 5d–O 2p conduction band states. The second derivative of the W L3-edge XANES spectra indicated an increase in structural disordering following repeated cycles of coloration and bleaching. However, the extended X-ray absorption fine structure analysis showed that the nearest-neighbor W–O bond distances in the samples overall remain unchanged by coloration and bleaching. The nanocrystalline tungsten oxide film exhibited more effective recovery ([similar]97% after first cycle) of the electronic structures than the other two crystalline samples in terms of the filling and unfilling of the W 5d–O 2p conduction band states after repeated coloration and bleaching. These results show that the nanocrystalline tungsten oxide sample has superior electrochromic properties to the crystalline samples.
Relation:	RSC Advances 4, pp.5036-5045
DOI:	10.1039/C3RA45421E
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

Files in This Item:

File	Size	Format
Correlation Between Electrochromism and Electronic Structures of Tungsten Oxide Films.pdf	1535Kb	Adobe PDF	1	View/Open
index.html	0Kb	HTML	394	View/Open
index.html	0Kb	HTML	75	View/Open

Loading...