Atomically Precise Nanocluster Assemblies Encapsulating Plasmonic Gold Nanorods

Amrita Chakraborty, Ann Candice Fernandez, Anirban Som, Biswajit Mondal, Ganapati Natarajan, Ganesan Paramasivam, Tanja Lahtinen, Hannu Häkkinen, Nonappa, Thalappil Pradeep

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)

Abstract

The self-assembled structures of atomically precise, ligand-protected noble metal nanoclusters leading to encapsulation of plasmonic gold nanorods (GNRs) is presented. Unlike highly sophisticated DNA nanotechnology, this strategically simple hydrogen bonding-directed self-assembly of nanoclusters leads to octahedral nanocrystals encapsulating GNRs. Specifically, the p-mercaptobenzoic acid (pMBA)-protected atomically precise silver nanocluster, Na4[Ag44(pMBA)30], and pMBA-functionalized GNRs were used. High-resolution transmission and scanning transmission electron tomographic reconstructions suggest that the geometry of the GNR surface is responsible for directing the assembly of silver nanoclusters via H-bonding, leading to octahedral symmetry. The use of water-dispersible gold nanoclusters, Au≈250(pMBA)n and Au102(pMBA)44, also formed layered shells encapsulating GNRs. Such cluster assemblies on colloidal particles are a new category of precision hybrids with diverse possibilities.

Original languageEnglish
Pages (from-to)6522-6526
JournalAngewandte Chemie - International Edition
Volume57
Issue number22
Early online date1 Jan 2018
DOIs
Publication statusPublished - May 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • Atomically precise nanoclusters
  • Hydrogen bonding
  • Plasmonic gold nanorods
  • Self-assembly
  • Supramolecular chemistry

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