Rossner Christian, Ebeling Bastian, Vana Philipp
Institut für Physikalische Chemie, Georg-August-Universität Göttingen, Tammannstraße 6, D-37077 Göttingen, Germany.
ACS Macro Lett. 2013 Dec 17;2(12):1073-1076. doi: 10.1021/mz400556q. Epub 2013 Nov 25.
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.
本文提出了一种将金纳米晶体可控组装成分散三维超结构的策略。使用多功能可逆加成-断裂链转移（RAFT）试剂制备了具有三硫代碳酸酯基团的多嵌段聚苯乙烯（分子量为4.4 - 17.8 kDa），这些基团作为各个嵌段之间的连接点。将这些聚合物添加到两相的布斯特-希夫林金纳米颗粒（粒径4.1 nm）中，导致形成了分散在甲苯中的稳定金纳米颗粒聚集体。透射电子显微镜（TEM）分析表明，通过使用具有调整聚合度从而调整三硫代碳酸酯间距的多嵌段聚合物，这些超结构中的颗粒间距离能够在前所未有的宽范围内进行调节。通过原子力显微镜（AFM）证明了组装体中的金纳米颗粒通过多功能三硫代碳酸酯进行交联，显示出在沉积到固体基质上后部分保留的球形形状。当需要在液相或表面调节纳米颗粒组装体中的颗粒间距离时，预计所报道的策略将被证明是有用的。
