Rapid synthesizing of gold nanobipyramids

Lv, Junliang; Sun, Xian-He; Zhan, Qiuqiang; He, Sailing; Forsberg, Erik

doi:10.1088/2053-1591/ab726b

Cited by 3 publications

References 23 publications

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Bipyramidal Nanocrystals of Noble Metals: From Synthesis to Applications

Yu,

Janssen,

Pawlik

et al. 2024

Chemistry A European J

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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.

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Bipyramidal Nanocrystals of Noble Metals: From Synthesis to Applications

Yu,

Janssen,

Pawlik

et al. 2024

Chemistry A European J

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Seed‐Mediated Synthesis of Gold Nanobipyramids at Low CTAB Concentration Using Binary Surfactants

Zhang,

Deng,

Chen

et al. 2024

Part & Part Syst Charact

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The conventional method for synthesizing gold nanobipyramids (AuNBPs) is well established. However, the cytotoxicity resulting from the conjugates between hexadecyltrimethylammonium bromide (CTAB) and gold limits their biomedical applications. This study introduces a dual surfactant approach with CTAB and sodium oleate (NaOL) in the seed‐mediated synthesis of the AuNBPs, which can significantly reduce the CTAB concentration to 10 mM. Additionally, optimal growth conditions are achieved by varying the volumes of seed solution, AgNO3, and HCl. Under low CTAB concentrations, AuNBPs with tunable sizes and localized surface plasmon resonances between 600 and 1200 nm are successfully synthesized, as characterized by UV–vis‐NIR spectroscopy, transmission electron microscopy (TEM), and finite‐difference time‐domain (FDTD) simulations. This work demonstrates a method for synthesizing AuNBPs at low CTAB concentrations using binary surfactants and provides a framework applicable to the synthesis of other metallic nanomaterials.

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