Preparation and Photochromic Properties of Tungstosilicate Acid/Organoamino-modified Silica Nanocomposite Films

Abstract

Abstract: A novel inorganic-organic nanocomposite film was prepared and characterized by IR, UV-Vis, XRD and DTA-TG. IR and UV-Vis spectra show that the Keggin structure of SiW ₁₂O₄₀^4- polyanion is preserved in the composite film and there is an interaction between H₄SiW₁₂O₄₀ and the organic substrate. The composite film showed a reversible photochromism. Under UV irradiation, the composite film turns blue and charge transfer occurs by oxidation of R-NH₃⁺ and reduction of SiW ₁₂O₄₀^4-. When the irradiated samples are placed in air and sheltered from the light, they change back to their original color, and recover again when being exposed to UV light.

Key words: Tungstosilicate acid, Sol-gel technique, Photochromism, Charge-transfer

CLC Number:

O635

TrendMD:

ZHANG Tie-Rui, JIN Ming, FENG Wei, LU Ran, BAO Chun-Yan, ZHAO Ying-Ying, LI Tie-Jin . Preparation and Photochromic Properties of Tungstosilicate Acid/Organoamino-modified Silica Nanocomposite Films[J]. Chem. J. Chinese Universities, 2002, 23(10): 1979.

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Preparation and Photochromic Properties of Tungstosilicate Acid/Organoamino-modified Silica Nanocomposite Films

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