Influence of ligand structure on the stability andoxidation of copper nanoparticles

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Original languageEnglish
Pages (from-to)88-95
JournalJournal of Colloid and Interface Science
Volume318
Issue number1
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

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Abstract

The stability and oxidation of copper nanoparticles stabilized with various ligands have been studied. Lauric acid-capped copper nanoparticles were prepared by a modified Brust–Schiffrin method. Then, ligand exchange with an excess of different capping agents was performed. Oxidation and stability were studied by UV–vis, XRD, and TEM. Alkanethiols and oleic acid were found to improve air stability. The oxidation resistance of thiol-capped copper nanoparticles was found to increase with the chain length of the thiol. However, excess thiol caused etching of the particles under nitrogen. With oleic acid no etching was observed under nitrogen. After oxidation, no traces of the ligand-exchanged particles were found, suggesting their dissolution due to excess ligand. Oleic acid protected the particles against oxidation better than the tested thiols at large excess (ligand–copper ratio 20:1).

    Research areas

  • Copper nanoparticles, Oxidation, Ligand exchange, Etching, Alkanethiols, Oleic acid, Lauric acid

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