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Type: Journal article
Title: Influence of cationic surfactants on the formation and surface oxidation states of gold nanoparticles produced via laser ablation
Author: Fong, Y.
Gascooke, J.
Visser, B.
Harris, H.
Cowie, B.
Thomsen, L.
Metha, G.
Buntine, M.
Citation: Langmuir: the ACS journal of surfaces and colloids, 2013; 29(40):12452-12462
Publisher: Amer Chemical Soc
Issue Date: 2013
ISSN: 0743-7463
Statement of
Yuen-Yan Fong, Jason R. Gascooke, Bradley R. Visser, Hugh H. Harris, Bruce C. C. Cowie, Lars Thomsen, Gregory F. Metha, and Mark A. Buntine
Abstract: We report on the time evolution of gold nanoparticles produced by laser ablation in the presence of the cationic surfactants cetyltrimethylammonium bromide (CTAB) and cetyltrimethylammonium chloride (CTAC) in aqueous solution. The broader applicability of a laser-induced nanoparticle formation kinetic model previously developed by us for the case of anionic surfactants in aqueous solution [ J. Phys. Chem. C 2010, 114, 15931−15940] is shown to also apply in the presence of cationic surfactants. We explore the surface properties of the nanoparticles produced in the presence of the cationic surfactants via synchrotron X-ray photoelectron spectroscopy (XPS). The XPS data indicate that at CTA⁺ concentrations approximating the aqueous critical micelle concentration Au(III) is present on the nanoparticle surface. Such oxidation is not observed at (i) lower CTA+ concentrations, (ii) in the presence of an anionic surfactant, or (iii) in the case of pure water as a solvent.
Rights: Copyright © 2013 American Chemical Society
DOI: 10.1021/la402234k
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Chemistry and Physics publications

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