Preparation and characterization of polyelectrolyte-coated gold nanoparticles.

Preparation and characterization of polyelectrolyte-coated gold nanoparticles. Research Abstract Details 

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Preparation and characterization of polyelectrolyte-coated gold nanoparticles. Abstract Text:

Annie Dorris,Simona Rucareanu,Linda Reven,Christopher J Barrett,R Bruce Lennox,

Gold nanoparticles of 5 nm diameter, stabilized by 4-(dimethylamino)pyridine (DMAP), were coated with poly(sodium 4-styrene sulfonate) (PSS) via electrostatic self-assembly. The suspension stability, monitored by the gold surface plasmon band (SPB), was studied by varying the pH, the PSS chain length, and PSS concentration. Enhanced stability is obtained at pH 10 (above the pKa of DMAP) when the polymer chain length matches or exceeds the particle circumference. Solid state 13C NMR was used to determine the presence of DMAP and polymers after subsequent deposition of weak and strong polycations: poly(allylamine hydrochloride) (PAH) and poly(diallyldimethylammonium chloride) (PDADMAC). At pH 10, DMAP remains associated with the nanoparticle after the first PSS layer has been formed. When PAH or PDADMAC are subsequently added at pH 4.5, DMAP is expelled, the suspensions remain stable, and zeta potential values indicate complete charge reversal. In the case of PDADMAC, however, the first layer of PSS is not fully retained. When PDADMAC is added at pH 10, DMAP and the first PSS layer are retained but lower zeta potentials and a higher SPB shift indicate a degraded stability. For PAH addition at pH 9.5, both DMAP and PSS are expelled and the suspension becomes unstable. These differences in stability of the multilayer components and the nanoparticle suspension are rationalized in terms of chain flexibility, polymer charge density, and the ability of the polymer functional groups to directly interact with the gold surface.

Preparation and characterization of polyelectrolyte-coated gold nanoparticles. Publishing Authors By Initials

A Dorris,S Rucareanu,L Reven,CJ Barrett,RB Lennox,

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Preparation and characterization of polyelectrolyte-coated gold nanoparticles. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Langmuir : the ACS journal of surfaces and colloid

VOLUME: 24

Page Numbers: 2532-8

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ISSN: 0743-7463

DAY: 30

MONTH: 01

YEAR: 2008

Preparation and characterization of polyelectrolyte-coated gold nanoparticles. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Preparation and characterization of polyelectrolyte-coated gold nanoparticles.

AFFILIATION: Centre for Self-Assembled Chemical Structures (CSACS), Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec, Canada H3A 2K6.

Country: United States

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MEDLINETA: Langmuir

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