Binary Superlattices of Gold Nanoparticles in Two Dimensions

Date
2022-04-21
Authors
Kim, Hyeong Jin
Wang, Wenjie
Zhang, Honghu
Freychet, Guillaume
Ocko, Benjamin M.
Travesset, Alex
Mallapragada, Surya
Vaknin, David
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American Chemical Society
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Ames Laboratory
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Neuroscience
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Chemical and Biological EngineeringMaterials Science and EngineeringAmes LaboratoryNeuroscience
Abstract
We have created two-dimensional (2D) binary superlattices by cocrystallizing gold nanoparticles (AuNPs) of two distinct sizes into √3 × √3 and 2 × 2 complex binary superlattices, derived from the hexagonal structures of the single components. The building blocks of these binary systems are AuNPs that are functionalized with different chain lengths of poly(ethylene glycol) (PEG). The assembly of these functionalized NPs at the air–water interface is driven by the presence of salt, causing PEG-AuNPs to migrate to the aqueous surface and assemble into a crystalline lattice. We have used liquid surface X-ray reflectivity (XR) and grazing incidence small-angle X-ray scattering (GISAXS) to examine the assembly and crystallization at the liquid interface.
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This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in The Journal of Physical Chemistry Letters, copyright © 2022 American Chemical Society after peer review. To access the final edited and published work see DOI: 10.1021/acs.jpclett.2c00625. Posted with permission.
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