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Self-Assembly of DNA Functionalized Gold Nanoparticles at the Liquid-Vapor Interface

TitleSelf-Assembly of DNA Functionalized Gold Nanoparticles at the Liquid-Vapor Interface
Publication TypeJournal Article
Year of Publication2016
AuthorsZhang, HH, Wang, WJ, Hagen, N, Kuzmenko, I, Akinc, M, Travesset, A, Mallapragada, S, Vaknin, D
JournalAdvanced Materials Interfaces
Volume3
Pagination1600180
Date Published08
Type of ArticleArticle
ISBN Number2196-7350
Accession NumberWOS:000383783200007
Keywordscapped nanoparticles, charged interfaces, chemistry, crystallization, DNA-functionalization, GISAXS, gold nanoparticles, interfacial, Materials Science, monolayers, nanocrystal superlattices, surface, systems, X-ray fluorescence
Abstract

ticle layer undergoes a transformation from short- to long-range (hexagonal) order above a threshold salt-concentration. Using various salts at similar ionic strength to those of MgCl2 or CaCl2 such as, NaCl or LaCl3, it is found that surface adsorbed NPs lack any order. X-ray fluorescence near total reflection of the same samples provides direct evidence of interfacial gold and more importantly a significant surface enrichment of the cations. Quantitative analysis reveals that divalent cations screen the charge of ssDNA, and that the hydrophobic hexyl-thiol group, commonly used to functionalize the ssDNA (for capping the AuNPs), is likely the driving force for the accumulation of the NPs at the interface.

DOI10.1002/admi.201600180
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Bioinspired Materials

Short TitleAdv. Mater. Interfaces
Alternate JournalAdv. Mater. Interfaces