Nucleation-controlled polymerization of nanoparticles into supramolecular structures.
Nucleation-controlled polymerization of nanoparticles into supramolecular structures.
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DOI：
10.1021/ja402757e
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发表时间：
2013-05
影响因子：
15
通讯作者：
Jing Wang;Hongwei Xia;Yanfeng Zhang;Hua Lu;Ranjan K Kamat;A. Dobrynin;Jianjun Cheng;Yao Lin
中科院分区：
文献类型：
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作者：
Jing Wang;Hongwei Xia;Yanfeng Zhang;Hua Lu;Ranjan K Kamat;A. Dobrynin;Jianjun Cheng;Yao Lin
将无机纳米颗粒控制组装成具有结构定义的超分子聚合物，将产生具有新的集体性质的纳米材料。然而，各向同性纳米粒子的超分子聚合仍然是一个挑战，因为这些单体中缺乏各向异性相互作用来进行定向缔合以协同生长超分子链。在这里，我们报道了聚(L-谷氨酸)接枝金纳米粒子在溶液中的自组装行为，并描述了吸引和排斥相互作用如何影响所产生的超分子组装的形状和大小。研究表明，超分子聚合物的链生长可以从NP单体中实现，该过程分为两个不同的阶段，即缓慢的成核步骤和较快的链增长步骤。得到的超分子结构既取决于聚L-谷氨酸在纳米颗粒上的接枝密度，也取决于纳米颗粒的大小。
Controlled assembly of inorganic nanoparticles (NPs) into structurally defined supramolecular polymers will create nanomaterials with new collective properties. However, supramolecular polymerization of isotropic NPs remains a challenge because of the lack of anisotropic interactions in these monomers to undergo directional associations for the cooperative growth of supramolecular chains. Herein we report self-assembly behavior of poly(l-glutamic acid)-grafted gold NPs in solution and describe how combined attractive and repulsive interactions influence the shape and size of the resulting supramolecular assemblies. The study shows that the chain growth of supramolecular polymers can be achieved from the NP monomers and the process occurs in two distinct stages, with a slow nucleation step followed by a faster chain propagation step. The resulting supramolecular structures depend on both the grafting density of the poly(l-glutamic acid) on the NPs and the size of the NPs.