The influence of SiO2 doping on the microstructure and photochromic behavior of phosphomolybdic acid/polyvinyl pyrrolidone hybrid films

• Published in: Journal of molecular structure Vol. 1075; pp. 154 - 158
• Main Authors: Dong, Qi, Wang, Xiang-Yu, Lu, Ya-Mei, Sun, Hai-Yan, Meng, Qing-Ling, Liu, Su-Ling, Feng, Wei, Han, Xiang-Kui
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05.10.2014
• Subjects: Hybrid films; Phosphomolybdic acid; Photochromism; Polyvinyl pyrrolidone; SiO2 doping; Polyvinyl pyrrolidone; Hybrid films; Photochromism; Phosphomolybdic acid; SiO2 doping
• ISSN: 0022-2860; 1872-8014
• DOI: 10.1016/j.molstruc.2014.07.003

•New hybrid films were synthesized by SiO2 doping into PMoA/PVP composite system.•SiO2 changed interaction between the heteropolyacid and the polymer.•SiO2 doped improved photochromic properties of PMoA/PVP film. New hybrid films were synthesized by SiO2 doping into phosphomolybdic acid (PMoA)/polyvinyl pyrrolidone (PVPd) composite system, and the effect of SiO2 doping on microstructure and photochromic properties was studied via atomic force microscope (AFM), Fourier transform infrared spectroscopy (FT-IR), ultraviolet–visible spectra (UV–vis) and X-ray photoelectron spectroscopy (XPS). The hybrid film surface with dome projection changed rough from smooth after SiO2 doping. The vibrational spectra of FT-IR verified that component of the heteropolyacids and the polymer did not changed, the vibration bands were expanded and had shifted by a few cm−1, and changed interaction between the acid and the polymer after SiO2 doping. The hybrid film exhibited a good photochromic property, which changed from colorless to blue under UV irradiation. The color change intensity of SiO2/PMoA/PVPd film was 1.48 times stronger than that of PMoA/PVPd under the same condition. XPS results indicated that the amount of PMoA in photo-reductive reaction was increased after SiO2 doping.