Yu Hansong, Janssen Annemieke, Pawlik Veronica, Xia Younan
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia, 30332, United States.
School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia, 30332, United States.
Chemistry. 2024 Oct 8;30(56):e202402478. doi: 10.1002/chem.202402478. Epub 2024 Sep 20.
Shape control has been a major theme of nanocrystal research in terms of synthesis, property tailoring, and optimization of performance in a variety of applications. Among the possible shapes, bipyramids are unique owing to their symmetry, planar defects, and exposed facets. In this article, we focus on the colloidal synthesis of noble-metal nanocrystals featuring a triangular bipyramidal shape, together with highlights of their properties and applications. We start with a brief discussion of the general classification and requirements for the nucleation and growth of bipyramidal nanocrystals, followed by specific aspects regarding the synthetic methods with a focus on the roles of reduction, etching, and capping, as well as controls of facet, size, aspect ratio, and corner truncation. In the end, we illustrate how these aspects affect the properties of bipyramidal nanocrystals for plasmonic and catalytic applications, together with future perspectives.
就合成、性能剪裁以及在各种应用中性能的优化而言，形状控制一直是纳米晶体研究的一个主要主题。在可能的形状中，双锥体因其对称性、平面缺陷和暴露的晶面而独具特色。在本文中，我们专注于具有三角双锥体形状的贵金属纳米晶体的胶体合成，以及它们的性质和应用亮点。我们首先简要讨论双锥体纳米晶体成核和生长的一般分类及要求，接着阐述合成方法的具体方面，重点关注还原、蚀刻和封端的作用，以及晶面、尺寸、纵横比和角截断的控制。最后，我们说明这些方面如何影响用于等离子体和催化应用的双锥体纳米晶体的性质，以及未来展望。
