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Controlled growth of metallic copper nanoparticles

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Abstract

We present a comprehensive characterization of Cu nanoparticles (NPs) synthesized by a polyol method, combining ethylene glycol, copper chloride, polyvinylpyrrolidone, sodium citrate and ascorbic acid. This simple and low cost synthesis results in a colloid containing nearly-monodispersed metallic NPs. Our investigation enabled two important stages to be distinguished during the growth reaction: (1) the first, revealed by in situ time resolved dispersive X-ray absorption spectroscopy (XAS), corresponds to a fast reduction/nucleation and early growth of metallic NPs, later corroborated by ex situ XAS measurements. The resulting Cu nanoparticles have a mean diameter of 1.5 ± 0.8 nm, as determined by TEM; (2) the second stage, monitored by TEM, HRTEM and XRD measurements, corresponds to a slow aggregation growth where the mean volume grows linearly with time with a rate of 2.1 ± 0.3 nm3 per day – proceeding while the NPs are kept in the colloidal solution. Such slow growth rate allows the aging time to be used for tuning the NP size; nevertheless, we show that size dispersion also increases with time following a similar rate.

Graphical abstract: Controlled growth of metallic copper nanoparticles

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Publication details

The article was received on 16 Aug 2017, accepted on 20 Oct 2017 and first published on 24 Oct 2017


Article type: Paper
DOI: 10.1039/C7NJ03056H
Citation: New J. Chem., 2017, Advance Article
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    Controlled growth of metallic copper nanoparticles

    J. Boita, L. Nicolao, M. C. M. Alves and J. Morais, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ03056H

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