Oxidation of copper nanoparticles in water: mechanistic insights revealed by oxygen uptake and spectroscopic methods

Oxidation of aqueous ∼8 nm unprotected copper nanoparticles takes place under air in approximately 2 hours at 30 °C to give Cu(2+) as a final product through an intermediate Cu(+) species. At 5 °C the process is about 5 times slower; similarly, vitamin C, which plays a sacrificial role, also slows d...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2013-04, Vol.42 (16), p.5832-5838
Main Authors: Pacioni, Natalia L, Filippenko, Vasilisa, Presseau, Nathalie, Scaiano, J C
Format: Article
Language:English
Subjects:
Catalysis
CATALYSTS
Colloiding
Copper
Nanoparticles
OXIDATION
OXYGEN
PARTICLES
Spectroscopy
Uptakes
Vitamin C
WATER
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Summary:Oxidation of aqueous ∼8 nm unprotected copper nanoparticles takes place under air in approximately 2 hours at 30 °C to give Cu(2+) as a final product through an intermediate Cu(+) species. At 5 °C the process is about 5 times slower; similarly, vitamin C, which plays a sacrificial role, also slows down the oxidation, while CuNP catalyses the oxidation. In this work, we present a detailed analysis of the oxidation mechanism of colloidal CuNP inferred through spectroscopic methods (UV-visible and EPR) combined with oxygen uptake measurements, with emphasis on factors affecting the oxidative process.
ISSN:1477-9226
1477-9234
DOI:10.1039/c3dt32836h