Microwave-assisted polyol synthesis of Cu nanoparticles |
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Authors: | M Blosi S Albonetti M Dondi C Martelli G Baldi |
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Institution: | (1) ISTEC-CNR, Institute of Science and Technology for Ceramics, CNR, National Research Council, Via Granarolo 64, 48018 Faenza, Italy;(2) Department of Industrial Chemistry and Materials, INSTM, Research Unit of Bologna, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy;(3) Department of Industrial Chemistry and Materials, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy;(4) CERICOL, Colorobbia Research, Via Pietramarina 123, 50053 Sovigliana Vinci, Italy |
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Abstract: | Microwave heating was applied to synthesize copper colloidal nanoparticles by a polyol method that exploits the chelating
and reducing power of a polidentate alcohol (diethylenglycol). The synthesis was carried out in the presence of eco-friendly
additives such as ascorbic acid (reducing agent) and polyvinylpirrolidone (chelating polymer) to improve the reduction kinetics
and sols stability. Prepared suspensions, obtained with very high reaction yield, were stable for months in spite of the high
metal concentration. In order to optimize suspensions, synthesis parameters were modified and the effects on particle size,
optical properties, and reaction yield were investigated. XRD analysis, scanning transmission electron microscopy (STEM),
and DLS measurements confirmed that prepared sols consist of crystalline metallic copper with a diameter ranging from 45 to
130 nm. Surface plasmon resonance (SPR) of Cu nanoparticles was monitored by UV–Vis spectroscopy and showed both a red shift
and a band weakening due to nanoparticle diameter increase. Microwave use provides rapid, uniform heating of reagents and
solvent, while accelerating the reduction of metal precursors and the nucleation of metal clusters, resulting in monodispersed
nanostructures. The proposed microwave-assisted synthesis, also usable in large-scale continuous production, makes process
intensification possible. |
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