Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 468, Issue -, Pages 140-150Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2014.12.017
Keywords
Gold nanoparticles; Direct reduction; Colloidal gold; Characterization; Morphology
Categories
Funding
- Spanish Ministry of Science and Innovation [ENE2011-23412]
- European Regional Developments Funds
- CSIC
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Gold nanoparticles (GNPs) were deposited onto carbon monoliths through direct chemical reduction of cationic gold sources. Colloidal gold particles were also deposited onto the same type of support to prepare a reference material. The Au/C structured materials were subjected to thermal treatment (annealing) up to 600 degrees C. Transformations in size, shape, chemical state and possible modifications in the lattice structure of GNPs due to thermal effects were evaluated by field emission gun (FEG), scanning electron microscopy (SEM), X-ray diffraction, X-ray photoelectron spectroscopy (XPS) and high resolution transmission electron microscopy (HRTEM). Evolution in size and shape of GNPs is compared with some of the models described in the bibliography for the melting of nanoparticles. No modification to either the lattice parameter or atomic structure in gold crystals was detected following annealing. The sintering process among gold nanoparticles could be observed in situ through HRTEM showing the aggregation mechanism for these particles. (C) 2014 Elsevier B.V. All rights reserved.
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