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Updated: May 29, 2025

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
Published on: May 9, 2014
Ligand-Mediated Highly Ordered Aggregation of 5-Mercapto-2-Nitrobenzoic Acid Protected Atomically Precise Silver
Soumyadip Roy1, Vikas Tiwari2, Tarak Karmakar2
1School of Nano Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
Abstract:
Understanding self-assembly of atomically precise nanoclusters is of paramount interest in designing various aggregated super-structures. Here pH-mediated self-assembly is reported of atomically precise Ag44(MNBA)30 (MNBA = 5-mercapto-2-nitrobenzoic acid) nanoclusters in aqueous solution. These nanoclusters formed hexagonal close-packed (hcp) structures when the pH of the solution is reduced from basic to neutral. High-resolution transmission microscopy result confirms bilayer and multilayer assembly at neutral pH. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR) analysis, and molecular dynamics simulation delineate ligand-mediated inter-cluster interactions such as ligand to metal core coordination, H─bonding and π-π interactions playing a crucial role in the formation of the hexagonal close-packed self-assembled structure.
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