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首页> 外文期刊>Chemistry: A European journal >Controlling the size and morphology of Au@Pd core-shell nanocrystals by manipulating the kinetics of seeded growth
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Controlling the size and morphology of Au@Pd core-shell nanocrystals by manipulating the kinetics of seeded growth

机译：通过控制种子生长的动力学来控制Au @ Pd核壳纳米晶体的尺寸和形态

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This article reports a systematic study of the seed-mediated growth of Au@Pd core-shell nanocrystals with a variety of controlled sizes and morphologies. The key to the success of this synthesis is to manipulate the reaction kinetics by tuning a set of reaction parameters, including the type and concentration of capping agent, the amount of ascorbic acid used as the reducing agent, and the injection rate used for the precursor solution. Starting from Au nanospheres of 11 nm in diameter as the seeds, Au@Pd core-shell nanocrystals with a number of morphologies, including octahedra, concave octahedra, rectangular bars, cubes, concave cubes, and dendrites, could all be obtained by simply altering the reaction rate. For the first time, it was possible to generate Au@Pd nanocrystals with concave structures on the surfaces while their sizes were kept below 20 nm. In addition, the as-prepared Au@Pd nanocubes can be used as seeds to generate Au@Pd@Au and Au@Pd@Au@Pd nanocrystals with multishelled structures.
机译：本文报道了对种子介导的Au @ Pd核壳纳米晶体的生长的系统研究，该晶体具有各种可控制的尺寸和形态。合成成功的关键是通过调整一组反应参数来控制反应动力学，这些参数包括封端剂的类型和浓度，用作还原剂的抗坏血酸的量以及用于前体的注入速率解。从直径为11 nm的金纳米球作为种子开始，具有多种形态的Au @ Pd核壳纳米晶体，包括八面体，凹面八面体，矩形棒，立方体，凹面立方体和树枝状晶体，都可以通过简单地改变来获得反应速度。首次有可能产生在表面上具有凹形结构的Au @ Pd纳米晶体，同时其尺寸保持在20 nm以下。此外，所制备的Au @ Pd纳米立方体可用作种子，以产生具有多壳结构的Au @ Pd @ Au和Au @ Pd @ Au @ Pd纳米晶体。

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