Abstract
Novel UV-light and visible-light photochromic inorganic–organic multilayers composed of polyoxometalates (phosphomolybdic acid (PMoA)) and poly(acrylamide) (PAM) were prepared by the layer-by-layer (LbL) self-assembly method. The grown process, composition, surface topography, and photochromic properties and mechanism of the multilayer films were investigated by ultraviolet–visible (UV–vis) spectra, Fourier transform infrared spectra (FT-IR), atomic force microscopy (AFM), electron resonance spectra (ESR), and X-ray photoelectron spectra (XPS). Irradiation with UV-light or visible-light, the transparent films changed from colorless to blue and showed reversible photochromism. PMoA/PAM LbL films had higher photochromic efficiency under UV-light irradiation than visible-light irradiation. The bleaching process occurred when the films were in contact with O2 in the dark or heated in air. The photochromic process of PMoA/PAM LbL film was in accordance with radical mechanism.
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The authors acknowledge the financial support from the National Natural Science Foundation of China (No. 61340048) and Industrial Technology Research and Development projects in Jilin Province (No.2013C044).
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Bao, Hf., Wang, Xy., Yang, Gq. et al. UV-light and visible-light photochromism of inorganic–organic multilayer films based on polyoxometalate and poly(acrylamide). Colloid Polym Sci 292, 2883–2889 (2014). https://doi.org/10.1007/s00396-014-3336-3
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DOI: https://doi.org/10.1007/s00396-014-3336-3