Abstract
Spherical polyelectrolyte brushes (SPBs) consisting of polystyrene (PS) core and poly(2-aminoethyl methacrylate hydrochloride) (PAEMH) shell were prepared by photo-emulsion polymerization. Au nanoparticles (Au-NPs) with controlled size and size distribution were synthesized in situ using SPBs as nanoreactors. Via layer-by-layer deposition technique on the surface of SPBs, nano-composite particles with Au/Ag-NPs bilayer and Au/Ag/Au-NPs trilayer were prepared. The structures of the as-prepared Au/Ag multilayer SPBs were characterized by UV-Vis spectroscopy, TEM, ICP-AES and DLS. The charge reversal of the nano-composite particles observed by zeta potential confirmed the success of layer-by-layer assembly. The Au/Ag-NPs bilayer nano-composite particles showed high catalytic efficiency with an apparent activation energy of about 41.2 kJ/mol in the reduction reaction of 4-nitrophenol to 4-aminophenol in the existence of sodium borohydride monitored. The catalytic activity of Au/Ag-NPs multilayer SPBs close to Au-NPs SPBs and much higher than Ag-NPs SPBs reveals its potential applications in cost-effective catalysts with high-performance.
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This work was financially supported by the National Natural Science Foundation of China (No. 51273063 and 51003028), the Fundamental Research Funds for the Central Universities, and the higher school specialized research fund for the doctoral program (No. 20110074110003), and 111 Project Grant (No. B08021).
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Zhao, F., Li, L., Tian, Yc. et al. Preparation of Au/Ag multilayers via layer-by-layer self-assembly in spherical polyelectrolyte brushes and their catalytic activity. Chin J Polym Sci 33, 1421–1430 (2015). https://doi.org/10.1007/s10118-015-1700-5
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DOI: https://doi.org/10.1007/s10118-015-1700-5