Spherical Gold-Nanoparticle Assemblies with Tunable Interparticle Distances Mediated by Multifunctional RAFT Polymers.
Spherical Gold-Nanoparticle Assemblies with Tunable Interparticle Distances Mediated by Multifunctional RAFT Polymers.
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DOI：
10.1021/mz400556q
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发表时间：
2013-11
影响因子：
5.8
通讯作者：
Christian Rossner;B. Ebeling;Philipp Vana
中科院分区：
文献类型：
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作者：
Christian Rossner;B. Ebeling;Philipp Vana
提出了一种将金纳米晶体可控组装成分散的三维超结构的策略。多功能RAFT试剂用于制备多嵌段聚苯乙烯（4.4- 17.8kDa），其中三硫代碳酸酯基团作为各个嵌段之间的连接。将这些聚合物添加到两相Brust-Schiffrin金纳米颗粒（4.1 nm）中导致形成分散在甲苯中的稳定的金纳米颗粒组装体。TEM分析表明，这些超结构中的颗粒间距离可以在前所未有的宽范围内进行调整，通过采用多嵌段聚合物与调整的聚合度，从而定制的三硫代碳酸酯的距离。通过AFM证实了多官能三硫代碳酸酯在组装体中的金纳米颗粒的交联，其在固体基底上沉积后显示出部分保留的球形形状。当纳米颗粒组装体中的颗粒间距离需要在液相或表面上调整时，预计所报告的策略将被证明是有用的。
A strategy for the controlled assembly of gold nanocrystals into dispersed three-dimensional superstructures is presented. A multifunctional RAFT agent was used to prepare multiblock polystyrene (4.4-17.8 kDa) with trithiocarbonate groups as junctions between the individual blocks. Addition of these polymers to two-phase Brust-Schiffrin gold nanoparticles (4.1 nm) resulted in the formation of stable gold-nanoparticle assemblies dispersed in toluene. TEM analysis revealed that the interparticle distances in these superstructures can be tuned over an unprecedented wide range by employing multiblock polymers with an adjusted degree of polymerization and thus tailored trithiocarbonate distances. Cross-linking of the gold nanoparticles in the assemblies by multifunctional trithiocarbonates was proven by AFM showing partly preserved globular shape after deposition on a solid substrate. The reported strategy is expected to prove useful when interparticle distances in nanoparticle assemblies need to be tuned in a liquid phase or on surfaces.