Influence of Cationic Surfactants on the Formation and Surface Oxidation States of Gold Nanoparticles Produced via Laser Ablation

Yuen-Yan Fong, Jason Gascooke, Bradley Visser, Hugh Harris, Bruce Cowie, Lars Thomsen, Gregory Metha, Mark Buntine

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    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 AuIII 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.

    Original languageEnglish
    Pages (from-to)12452-12462
    Number of pages11
    JournalLangmuir
    Volume29
    Issue number40
    DOIs
    Publication statusPublished - 8 Oct 2013

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