Copper assisted symmetry and size control of gold nanobars

Li, Weilun; Tong, Wenming; Etheridge, Joanne; Funston, Alison M.

doi:10.1039/d2tc05286e

Cited by 1 publication

(1 citation statement)

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“…Factors such as temperature, supersaturation conditions, pH, or additives modify the reaction kinetics to generate different growth patterns. − Moreover, the anisotropic growth of MTP can be induced by aiming the kinetic regime, and it can be assisted by incorporating a second metal precursor during crystal growth, − changing the deposition rates generating multiarmed NPs. − In this regard, gold–copper nanoparticles (Au–Cu NPs) can be made by the seed-mediated wet-chemical reduction , in which oleylamine (OLA) is a common solvent, reducing agent, and stabilizer, able to produce metallic NPs with close size distribution and multiply twinned structure since its preferential attachment to {111} facets . The seed-mediated method enables fine control over the size and shape of different NPs through the synthesis parameters, regulating the growth kinetics to promote one structure over the other .…”

Section: Introductionmentioning

confidence: 99%

Kinetical Evolution from Icosahedrons to Triangular Nanotripods: Factors Affecting Symmetry Breaking in Au–Cu Multiply Twinned Nanoparticles, Ligand Exchange, and Repercussion in the Catalytic Activity

López-López,

Hernández-Zempoaltecatl,

Bazán-Díaz

et al. 2024

Chem. Mater.

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Anisotropic bimetallic multiply twinned nanoparticles possess unique properties that depend not only on the shape but also on the crystal and defect structures. Hence, control over the synthesis parameters is paramount to control the reaction kinetics, obtaining symmetric or anisotropic nanoparticles with a tunable crystal and defect structure. Herein, we report the kinetic control for the growth of Au−Cu anisotropic nanoparticles synthesized through a seed-mediated approach, enabling the evolution from Au icosahedral seeds to symmetrical Au−Cu nanoparticles or multiply twinned Au−Cu triangular nanotripods. The anisotropic growth was induced by maneuvering the metal-toseed ratio and temperature. The effects of the metal-to-seed ratio, temperature, and Cu/Au ratio were determined, providing information on the role of these parameters in the reaction. The presence of Cu in this oleylamine (OLA)-based synthesis is decisive for the anisotropic growth, enhancing particle growth and homogeneity. Evolution experiments showed a cyclic-type growth pathway of the nanotripods. The enhanced catalytic properties of the produced Au−Cu multiply twinned nanotripods were tested in the reduction of 4-nitrophenol, for which a ligand exchange was carried out replacing oleylamine capping for poly(diallyldimethylammonium) chloride. The Au−Cu nanotripods showed high activity with a low metal loading.

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