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Assembling Bare Au Nanoparticles at Positively Charged Templates

TitleAssembling Bare Au Nanoparticles at Positively Charged Templates
Publication TypeJournal Article
Year of Publication2016
AuthorsWang, WJ, Zhang, HH, Kuzmenko, I, Mallapragada, S, Vaknin, D
JournalScientific Reports
Date Published05
Type of ArticleArticle
ISBN Number2045-2322
Accession NumberWOS:000376525900001
Keywordsair-liquid interface, colloidal crystals, crystallization, dna-capped nanoparticles, monolayers, phase-transitions, protein, real-time, salt, Technology - Other Topics

In-situ X-ray reflectivity (XRR) and grazing incidence X-ray small-angle scattering (GISAXS) reveal that unfunctionalized (bare) gold nanoparticles (AuNP) spontaneously adsorb to a cationic lipid template formed by a Langmuir monolayer of DPTAP (1,2-dihexadecanoyl-3-trimethylammonium-propane) at vapor/aqueous interfaces. Analysis of the XRR yields the electron density profile across the charged-interfaces along the surface normal showing the AuNPs assemble with vertical thickness comparable to the particle size. The GISAXS analysis indicates that the adsorbed mono-particle layer exhibits short-range in-plane correlations. By contrast, single-stranded DNA-functionalized AuNPs, while attracted to the positively charged surface (more efficiently with the addition of salt to the solution), display less in-plane regular packing compared to bare AuNPs.

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