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Issue 18, 2016
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Role of ligand–ligand vs. core–core interactions in gold nanoclusters

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The controlled assembly of ligand-coated gold nanoclusters (NCs) into larger structures paves the way for new applications ranging from electronics to nanomedicine. Here, we demonstrate through rigorous density functional theory (DFT) calculations employing novel functionals accounting for van der Waals forces that the ligand–ligand interactions determine whether stable assemblies can be formed. The study of NCs with different core sizes, symmetry forms, ligand lengths, mutual crystal orientations, and in the presence of a solvent suggests that core-to-core van der Waals interactions play a lesser role in the assembly. The dominant interactions originate from combination of steric effects, augmented by ligand bundling on NC facets, and related to them changes in electronic properties induced by neighbouring NCs. We also show that, in contrast to standard colloidal theory approach, DFT correctly reproduces the surprising experimental trends in the strength of the inter-particle interaction observed when varying the length of the ligands. The results underpin the importance of understanding NC interactions in designing gold NCs for a specific function.

Graphical abstract: Role of ligand–ligand vs. core–core interactions in gold nanoclusters

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The article was received on 06 Nov 2015, accepted on 11 Apr 2016 and first published on 11 Apr 2016

Article type: Paper
DOI: 10.1039/C5CP06795B
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Phys. Chem. Chem. Phys., 2016,18, 12716-12724

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    Role of ligand–ligand vs. core–core interactions in gold nanoclusters

    K. Z. Milowska and J. K. Stolarczyk, Phys. Chem. Chem. Phys., 2016, 18, 12716
    DOI: 10.1039/C5CP06795B

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