Shape control beyond the seeds in gold nanoparticles

Weilun Li, Wenming Tong, Anchal Yadav, Eva Bladt, Sara Bals, Alison M. Funston, Joanne Etheridge

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

In typical seed-mediated syntheses of metal nanocrystals, the shape of the nanocrystal is determined largely by the seed nucleation environment and subsequent growth environment (where "environment"refers to the chemical environment, including the surfactant and additives). In this approach, crystallinity is typically determined by the seeds, and surfaces are controlled by the environment(s). However, surface energies, and crystallinity, are both influenced by the choice of environment(s). This limits the permutations of crystallinity and surface facets that can be mixed and matched to generate new nanocrystal morphologies. Here, we control post-seed growth to deliberately incorporate twin planes during the growth stage to deliver new final morphologies, including twinned cubes and bipyramids from single-crystal seeds. The nature and number of twin planes, together with surfactant control of facet growth, define the final nanoparticle morphology. Moreover, by breaking symmetry, the twin planes introduce new facet orientations. This additional mechanism opens new routes for the synthesis of different morphologies and facet orientations.

Original languageEnglish
Pages (from-to)9152-9164
Number of pages13
JournalChemistry of Materials
Volume33
Issue number23
DOIs
Publication statusPublished - 30 Nov 2021

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