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Citation: Guan Zi-Sheng, Yang Yong-An, Ma Ying, Yao Jian-Nian. Raman Study of the Electrochromic V₂O₅ Films[J]. Acta Physico-Chimica Sinica, ;1999, 15(03): 279-283. doi: 10.3866/PKU.WHXB19990316 shu

Raman Study of the Electrochromic V₂O₅ Films

1.
Institute of Photographic Chemistry,Chinese Academy of Sciences,Beijing 100101

Received Date: 24 April 1998
Available Online: 15 March 1999

The amorphous V 2O 5 films prepared by vacuum evaporation are unstable and easily dissolved by electrolyte during the electrochromic process, so unfit to make electrochromic materials. We found that the annealed films have enhanced stability and electrochromic properties. We studied the microstructural changes during the electrochromic process by Raman spectra and discussed the mechanism for the enhancement. The results indicated that the amorphous films annealed by 400-500℃became polycrystalline and the films contained (V 2O 5)n ordered chains which prevented the films from solution effectively and enhanced the electrochromic characteristics. When colored and decolored, the microstructure of the polycrystalline V 2O 5 films changed inversely. During the cathodic polarization process, Li+ inserted into the V 2O 5 crystal cell , formed V-O-Li band, disordered the films and UV absorption of the films blue shifted. On the contrary , during the anodic polarization process, Li +escaped from the crystal cell. The films largely restored .
- V2O5,
- Vacuum-evaporated films,
- Annealing,
- Electrochromism,
- Raman spectra
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沈阳化工大学材料科学与工程学院沈阳 110142

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Raman Study of the Electrochromic V₂O₅ Films