Atomically Precise Nanocluster Assemblies Encapsulating Plasmonic Gold Nanorods |
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| Authors: | Amrita Chakraborty Ann Candice Fernandez Dr. Anirban Som Biswajit Mondal Dr. Ganapati Natarajan Dr. Ganesan Paramasivam Dr. Tanja Lahtinen Prof. Hannu Häkkinen Dr. Nonappa Prof. Thalappil Pradeep |
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| Affiliation: | 1. DST Unit of Nanoscience and Thematic Unit of Excellence, Department of Chemistry, Indian Institute of Technology Madras, Chennai, India;2. Current address, Department of Chemistry, University of Massachusetts, Amherst, MA, USA;3. Departments of Chemistry and Physics, Nanoscience Centre, University of Jyv?skyl?, Jyv?skyl?, Finland;4. Departments of Applied Physics and Bioproducts & Biosystems, Aalto University, Aalto, Finland |
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| 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. |
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| Keywords: | atomically precise nanoclusters hydrogen bonding plasmonic gold nanorods self-assembly supramolecular chemistry |
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