Self-Assembled Plasmonic Dimers of Amphiphilic Gold Nanocrystals
Self-Assembled Plasmonic Dimers of Amphiphilic Gold Nanocrystals
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两亲性金纳米晶体的自组装等离子体二聚体
DOI：
10.1021/jz201011b
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发表时间：
2011-09-01
影响因子：
5.7
通讯作者：
Duan, Hongwei
中科院分区：
文献类型：
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作者：
Cheng, Lin;Song, Jibin;Duan, Hongwei
我们报道了一种新的策略，通过在选择性溶剂中接枝到纳米粒子表面的两亲性聚合物刷的链重组，将具有各向同性表面化学的大的(>；40 nm)金纳米粒子组装成各向异性的等离子体二聚体。对于需要表面等离子体共振的近场强耦合的应用，高纯度二聚体的生产具有相当大的兴趣。体相和单颗粒水平的成像和光谱表征证实了纳米颗粒二聚体的形成。通过调控两亲性纳米晶体的组装/分解，可以可逆地控制粒子间的等离子体耦合。通过串联“接枝”和“接枝”反应对不同化学成分和形貌的纳米晶进行表面修饰的普遍适用性提供了将这一概念扩展到其他类型的功能纳米晶的可能性。
We report a new strategy to assemble large (>40 nm) gold nanoparticles with isotropic surface chemistry into anisotropic plasmonic dimers by taking advantage of the chain reorganization of the amphiphilic polymer brushes grafted on nanoparticle surfaces in selective solvents. Production of high-purity dimers is of considerable interest for applications requiring strong near-field coupling of surface plasmon resonances. The formation of nanoparticle dimers is confirmed by imaging and spectroscopic characterization at both bulk and single-particle levels. The interparticle plasmonic coupling can be reversibly controlled by modulating the assembly/disassembly of the amphiphilic nanocrystals. The general applicability of surface modification of nanocrystals of diverse chemical compositions and morphologies through tandem “grafting to” and “grafting from” reactions offers the possibility to extend this concept to other types of functional nanocrystals.