Controlling shell thickness in core-shell gold nanoparticles via surface-templated adsorption of block copolymer surfactants

被引:121
作者
Kang, YJ [1 ]
Taton, TA [1 ]
机构
[1] Univ Minnesota, Dept Chem, Minneapolis, MN 55455 USA
关键词
D O I
10.1021/ma050400c
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
When Au nanoparticles are encapsulated within shells of cross-linked, block copolymer amphiphiles, the structure of the shells is determined by the initial interaction between the amphiphile and the nanoparticle surface. In the case of small nanoparticles, for which particle size is comparable to the dimension of the block copolymer (rho(Au)/R-g approximate to 1), particles act like solutes that are dissolved within polystyrene-block-poly(acrylic acid) (PS-b-PAA) micelle cores. In the case of larger nanoparticles (rho(Au)/R-g > 1), PS-b-PAA adsorption is templated by the particle surface, and a concentric core-shell structure is formed. The thickness of this shell can be predicted from theoretical models of polymer adsorption onto highly curved surfaces and controlled by varying the ratio of polymer to available nanoparticle surface area. We anticipate that these rules will illustrate how cross-linked copolymer shells with predetermined thickness can be used to stabilize and functionalize a variety of nanoparticle materials.
引用
收藏
页码:6115 / 6121
页数:7
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