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Nanoscale Faceting and Ligand Shell Structure Dominate the Self-Assembly of Non-Polar Nanoparticles into Superlattices

  • Self-assembly of nanoscale structures at liquid-solid interfaces occurs in a broad range of industrial processes and is found in various phenomena in nature. Conventional theory assumes spherical particles and homogeneous surfaces, but that model is oversimplified, and nanoscale in-situ observations are needed for a more complete understanding. We used liquid phase scanning transmission electron microscopy (LP-STEM) to examine the interactions that direct the self-assembly of superlattices formed by gold nanoparticles (AuNPs) in non-polar liquids. Varying the molecular coating of the substrate modulated short-ranged attraction and led to switching between a range of different geometric structures including hexagonal close-packed (hcp), simple hexagonal (sh), dodecahedral quasi-crystal (dqc), and body-centered cubic (bcc) lattices, as well as random distributions. Langevin dynamics simulations explain the experimental results in terms of the interplay between nanoparticle faceting, ligand shell structure, and substrate-NP-interactions.

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Document Type:Article
Author:Arixin BoORCiD, Yawei LiuORCiD, Björn KuttichORCiD, Tobias KrausORCiD, Asaph Widmer-CooperORCiD, Niels de JongeORCiD
Parent Title (English):Advanced materials
First Page:2109093
Year of first Publication:2022
Release Date:2022/08/03
Tag:liquid phase electron microscopy; nanoparticle faceting; self-assembly; superlattice; surface modification
Impact:32.086 (2021)
Funding Information:Australian Research Council. Grant Number: CE170100026 Deutsche Forschungsgemeinschaft
Groups:Innovative Elektronenmikroskopie
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 660 Technische Chemie
Open Access:Open Access
Signature:INM 2022/036
Licence (German):License LogoCreative Commons - CC BY-NC - Namensnennung - Nicht kommerziell 4.0 International