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本文首先采用RAFT聚合法合成了端基为双硫酯的聚-4-乙烯基吡啶(P4VP),进一步使用NaBH4还原得到端基为巯基的P4VP,最后通过原位还原法在HAuCl4水溶液中合成了Au@P4VP纳米复合粒子(Au@P4VP NPs).通过UV-vis、FT-IR、XRD、SEM、DLS及TEM等手段表征其结构,证明成功合成了金纳米复合粒子.研究表明:金纳米复合粒子的粒径和形貌与P4VP的浓度及溶液的pH值有关.当P4VP和HAuCl4的物质的量之比为2时,得到的金纳米粒子的形貌和粒径最好;在P4VP的物质的量很小时,得到了三角形和不规则形状的金纳米粒子.当金纳米复合粒子溶液的pH<3.2时,得到的纳米粒子具有很好的分散性且粒径较小;若溶液的pH>3.2,得到的纳米粒子粒径较大,且发生一定程度的团聚.
In this paper, poly (4-vinylpyridine) (P4VP) with terminal thioesters was synthesized by RAFT polymerization. P4VP with terminal sulfhydryl group was further reduced by NaBH4, and finally synthesized by in situ reduction in aqueous HAuCl4 The Au @ P4VP NPs were characterized by UV-vis, FT-IR, XRD, SEM, DLS and TEM. The results show that the Au / The size and morphology of the particles are related to the concentration of P4VP and the pH value of the solution.When the ratio of the amount of P4VP to HAuCl4 is 2, the morphology and particle size of the obtained gold nanoparticles are the best. When the pH value of the gold nanocomposite particles solution is less than 3.2, the obtained nanoparticles have good dispersibility and the particle size is small; if the pH of the solution is higher than that of the gold nanoparticles, 3.2, the resulting nanoparticles larger particle size, and the occurrence of a certain degree of agglomeration.