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首页> 外文期刊>Crystal growth & design >Shape-dependent evolution of Au@Ag core-shell nanocrystals by PVP-assisted N,N-dimethylformamide reduction
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Shape-dependent evolution of Au@Ag core-shell nanocrystals by PVP-assisted N,N-dimethylformamide reduction

机译：PVP辅助的N，N-二甲基甲酰胺还原对Au @ Ag核壳纳米晶体的形状依赖性演化

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摘要

Shape-dependent Au@Ag core-shell nanocrystals have been successfully synthesized by using a two-step method. Firsts An nanocrystal seeds with various shapes including single-crystal octahedron, single-twinned triangle or hexagon plate, and multiple-twinned decahedron were prepared by reducing HAuCl4 in ethylene glycol (EG) in the presence of polyvinylpyrrolidone (PVP) as a polymer surfactant under the condition of microwave heating. Subsequently, thus-obtained An seeds were added into N,N-dimethylformamide (DMF) solution containing Ag+ ions for overgrowth of Ag shells by an oil-bath heating. Transmission electron microscope (TEM) observation demonstrates that shapes of formed Ag shells strongly depend on shapes of initiated Au seeds. These newly produced triangular or hexagonal platelike, octahedral, and multiple-twinned decahedral Au@Ag nanocrystals are mainly dominated by the Ag shells having {111} facets. This case is completely different from that previously investigated by us in EG system where formed triangular-bipyramidal, cubic, and pentagonal rod/wire Au@Ag core-shell nanostructures are surrounded by the Ag shells with {100} facets. Our studies reveal that it is possible to controllably prepare the Au@Ag core/shell nanocrystal structures with optional uniform crystalline planes by the same An seed source and different reaction solvent.
机译：通过两步法成功地合成了形状相关的Au @ Ag核壳纳米晶体。首先，在聚乙烯吡咯烷酮（PVP）作为聚合物表面活性剂的条件下，在乙二醇（EG）存在下，通过在乙二醇（EG）中还原HAuCl4，制备了包括单晶八面体，单晶三角形或六面体板和多晶十面体在内的各种形状的纳米晶种子。微波加热的条件。随后，将如此获得的An种子添加到含有Ag +离子的N，N-二甲基甲酰胺（DMF）溶液中，以通过油浴加热来使Ag壳过度生长。透射电子显微镜（TEM）观察表明，形成的银壳的形状很大程度上取决于引发的金种子的形状。这些新产生的三角形或六边形的板状，八面体和多晶的十面体Au @ Ag纳米晶体主要由具有{111}刻面的Ag壳构成。这种情况与我们先前在EG系统中研究的情况完全不同，在EG系统中，形成的三角形-双锥体，立方和五边形的棒/线Au @ Ag核壳纳米结构被具有{100}刻面的Ag壳包围。我们的研究表明，可以通过相同的An种子源和不同的反应溶剂可控地制备具有可选的均匀晶面的Au @ Ag核/壳纳米晶体结构。

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