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Interfacial Self-Assembly of Polyelectrolyte-Capped Gold Nanoparticles

TitleInterfacial Self-Assembly of Polyelectrolyte-Capped Gold Nanoparticles
Publication TypeJournal Article
Year of Publication2017
AuthorsZhang, HH, Nayak, S, Wang, WJ, Mallapragada, S, Vaknin, D
JournalLangmuir
Volume33
Pagination12227-12234
Date Published10
Type of ArticleArticle
ISBN Number0743-7463
Accession NumberWOS:000414383300043
Keywordsaqueous-solution, by-layer deposition, charged nanoparticles, chemistry, crystallization, dna, liquid interfaces, macroscopic materials, Materials Science, monolayers, nanocrystals, superlattices
Abstract

rotonation of carboxyl groups and to hydrogen bonding between the neighboring PAA-AuNPs. In addition, we show that adding MgCl2 to PAA-AuNP suspensions also induces adsorption at the interface and that the high affinity between magnesium ions and carboxyl groups leads to two- and three-dimensional clusters that yield partial surface coverage and poorer ordering of NPs at the interface. We also examine the assembly of PAA-AuNPs in the presence of a positively charged Langmuir monolayer that promotes the attraction of the negatively charged capped NPs by electrostatic forces. Our results show that synthetic polyelectrolyte-functionalized nanoparticles exhibit interfacial self-assembly behavior similar to that of DNA-functionalized nanoparticles, providing a pathway for nanoparticle assembly in general.

DOI10.1021/acs.langmuir.7b02359
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