Layer-by-layer self-assembly of dye-polyoxometalate multilayer composite films and their fluorescent properties |
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Authors: | Yonghui Wang |
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Affiliation: | a Institute of Polyoxometalate Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, PR China b Department of Chemistry, Beijing Institute of Technology, Beijing, 100081, PR China |
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Abstract: | The layer-by-layer (LbL) self-assembly technique was successfully applied to the fabrication of dye-polyoxometalate multilayer composite films consisting of two dye molecules Rhodamine B (RB) and Rhodamine 6G (R6G) and a Keggin-type polyoxometalate α-SiW12O40]4− (α-SiW12). The composite films were characterized by UV-vis spectroscopy, scanning electron microscopy (SEM), and fluorescence spectroscopy. UV-vis spectra show that the characteristic absorbance values of the multilayer films increase almost linearly with the number of dye/α-SiW12 bilayers, suggesting that the deposition process is regular and highly reproducible from layer to layer. SEM micrographs indicate that the film surface is a little rough with some individual granular domains. In addition, the fluorescent properties of these composite films were also investigated by fluorescence spectroscopy. |
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Keywords: | 81 15-z 78 20-e |
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