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Enhanced thermal stability of monodispersed silver cluster arrays assembled on block copolymer scaffolds

机译：组装在嵌段共聚物支架上的单分散银簇阵列的增强的热稳定性

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摘要

Triblock copolymer poly(styrene-b-butadiene-b-styrene) (SBS) films with long-range ordered self-assembled nanopatterns are used as templates to selectively adsorb soft-landing silver clusters. Closely spaced cluster arrays with high monodispersity are formed through the confinement of the block copolymer scaffolds, and show a much enhanced thermal stability as compared with the cluster assemblies on the surfaces of covalent amorphous solids, or even on the disordered SBS films. Their morphologies are barely influenced by long time thermal annealing at a temperature as high as 180 degrees C, while in the latter case intense aggregations and coalescences of silver clusters are commonly observed upon annealing. The different thermal stabilities of the cluster assemblies also induce different evolutions of their optical extinction spectra under annealing. This promises a simple way to control the monodispersity and thermal stability of metal cluster assembly via self-assembled block copolymer template.
机译：具有长程有序自组装纳米图案的三嵌段共聚物聚（苯乙烯-b-丁二烯-b-苯乙烯）（SBS）薄膜用作模板，以选择性吸附软着陆的银团簇。通过限制嵌段共聚物支架形成具有高单分散性的紧密排列的簇阵列，并且与共价无定形固体表面甚至无序SBS薄膜上的簇组件相比，其热稳定性大大提高。它们的形态几乎不受高温高达180摄氏度的长时间热退火的影响，而在后一种情况下，退火后通常会观察到强烈的聚集和银团簇的聚结。在退火条件下，簇组件的不同热稳定性也会引起其消光光谱的不同演变。这有望通过自组装的嵌段共聚物模板来控制金属簇组件的单分散性和热稳定性的简单方法。

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