文献类型：期刊文献

英文题名：Preparation of Au/Ag multilayers via layer-by-layer self-assembly in spherical polyelectrolyte brushes and their catalytic activity

作者：Zhao, Fei[1];Li, Li[1];Tian, Yu-chuan[1];Liu, Jian-jia[1];Wang, Jian-jun[1];Zhou, Zhi-ming[1];Lv, Chun-xiang[2];Guo, Xu-hong[1,3,4]

机构：[1]E China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[2]Natl Engn Lab Carbon Fiber Technol, Taiyuan 030001, Peoples R China;[3]Shihezi Univ, Key Lab Xinjiang Uygur Autonomous Reg, Shihezi 832000, Peoples R China;[4]Shihezi Univ, Engn Res Ctr Xinjiang Bingtuan Mat Oriented Chem, Shihezi 832000, Peoples R China

年份：2015

卷号：33

期号：10

起止页码：1421

外文期刊名：CHINESE JOURNAL OF POLYMER SCIENCE

收录：;EI(收录号：20212810632164);WOS:【SCI-EXPANDED(收录号:WOS:000359819700007)】；

基金：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).

语种：英文

外文关键词：Layer-by-layer self-assembly; Spherical polyelectrolyte brushes; Catalytic activity

摘要：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.