高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (2): 204.

• 研究论文 • 上一篇    下一篇

镶嵌钨硅酸的新型有机-无机纳米复合薄膜的制备及光致变色性能研究

黄焱, 潘庆谊, 程知萱, 张雯, 夏崴   

  1. 上海大学理学院化学系, 上海 200436
  • 收稿日期:2004-04-01 出版日期:2005-02-10 发布日期:2005-02-10
  • 通讯作者: 潘庆谊(1946年出生),男,博士,教授,主要从事无机固体化学研究.E-mail:qypan@staff.shu.edu.cn E-mail:qypan@staff.shu.edu.cn
  • 基金资助:

    上海市纳米专项基金(批准号:0452nm073)资助

Synthesis and Photochroism of a Novel Organic-inorganic Nanocomposite Film Entrapping Tungstosilicate Acid

HUANG Yan, PAN Qing-Yi, CHENG Zhi-Xuan, ZHANG Wen, XIA Wei   

  1. Department of Chemistry, College of Science, Shanghai University, Shanghai 200436, China
  • Received:2004-04-01 Online:2005-02-10 Published:2005-02-10

摘要: 将超分子自组装技术与Sol-gel过程相结合,制备了镶嵌Keggin结构钨硅酸的MAAM/VTEOS/TEOS纳米复合薄膜,并采用IR,XRD和TG-DSC等方法对薄膜进行了结构表征.在复合薄膜光照变蓝后,通过UV-Vis和ESR光谱对薄膜的光致变色性能及其机理进行了研究.结果表明,钨硅酸在复合网络中仍保持Keggin结构,与有机-无机复合基体中的—NH2通过氢键发生强烈的相互作用,经紫外光照后发生电荷转移,[SiW12O40]4-被还原为[SiW12O40]5-,同时产生氨基自由基.褪色过程则与氧气存在与否有关,实验结果表明,该薄膜具有良好的光致变色性能,对光有较快的响应恢复速度和良好的可逆重复性.

关键词: 有机-无机复合, 自组装, 溶胶-凝胶法, 光致变色, 钨硅酸

Abstract: A novel photochromic organic-inorganic nanocomposite film was prepared through entrapping Keggin structure H4SiW12O40 into MAAM/VTEOS/TEOS matrix by combining supramolecular self-assembly technology with sol-gel process. The composite film was characterized by IR, XRD and TG-DSC, and its photochromic behavior and mechanism were also studied and discussed. The transparent film changed from colorless to dark-blue under UV irradiation and was measured by UV-Vis and ESR spectra. The results indicate that [SiW12O40]4- anions maintain Keggin structure in the composite film and interacted strongly with NH2 group of the matrix via hydrogen bond. After irradiation under UV light, a hydrogen atom is transferred to a [SiW12O40]4- anion, and a free radical is formed at the same time. The bleaching process is closely related to the presence of O2, and the experiments show that the composite film has excellent photochromic properties, with a short response and bleaching time and good reversibility.

Key words: Organic-inorganic composite, Self-assembly, Sol-gel method, Photochroism, Tungstosilicate acid

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