Effect of thermal treatments on the morphology, chemical state and lattice structure of gold nanoparticles deposited onto carbon structured monoliths

•Gold nanoparticles are deposited onto carbon monoliths.•Gold is reduced by the carbon support itself.•Materials are characterized by different techniques FEG–SEM, XRD, XPS and HRTEM.•Heat treatment led to changes in gold particle morphology. Gold nanoparticles (GNPs) were deposited onto carbon mono...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2015-03, Vol.468, p.140-150
Main Authors: Ballestero, Diego, Juan, Roberto, Ibarra, Alfonso, Gómez-Giménez, Carmen, Ruiz, Carmen, Rubio, Begoña, Teresa Izquierdo, María
Format: Article
Language:English
Subjects:
Annealing
Carbon
Characterization
Colloidal gold
Deposition
Direct reduction
Gold
Gold nanoparticles
Lattices
Morphology
Nanoparticles
Scanning electron microscopy
X-rays
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Summary:•Gold nanoparticles are deposited onto carbon monoliths.•Gold is reduced by the carbon support itself.•Materials are characterized by different techniques FEG–SEM, XRD, XPS and HRTEM.•Heat treatment led to changes in gold particle morphology. 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°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.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2014.12.017