Nanotechnology · 2013 · 69 citations · 37 references
Natural SciencesChemistryMaterials ScienceInorganic ChemistryMaterials ChemistryNanomaterialsMicrowave-assisted SynthesisNanomaterial CharacterizationNanomaterials SynthesisNanoparticle StabilityNanoparticle SurfacesNanoparticle SynthesisMetal NanoparticlesMicrowave-assisted Nanomaterial SynthesisNanomaterial StabilityNanoparticle Surface ChemistryNanoparticlesOxidationPowder DiffractionPowder Diffraction Analysis
Air-stable bimetallic Cu-Ag nanoparticles in the range of 12-30 nm have been synthesized at gram scale by a facile alcohol reduction in the absence of surfactants with the assistance of microwave irradiation. The synthesized nanoparticles were analyzed by x-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning TEM, ultraviolet-visible spectroscopy, x-ray photoelectron spectroscopy and thermogravimetry (TG). The stability of the bimetallic nanoparticles against oxidation was examined by TG and in situ temperature-programmed XRD analyses in the atmosphere. No oxidation of copper was confirmed by XRD after storing for longer than 6 months in the atmosphere at room temperature. No oxidation took place below 118 ° C and the Cu(200) diffraction peak decreased by only 7% after heating at 100 ° C for 30 min. The oxidation resistance has been ascribed to a Cu core-Ag shell structure, probably owing to the suppressive effect of Ag on the surface through the electronic interaction with Cu and a physical barrier of oxygen.
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XPS study of the Cu@Cu2O core-shell nanoparticles
T. Ghodselahi, M. A. Vesaghi, Azizollah Shafiekhani et al. · Applied Surface Science · 2008 · 769 citations
Natural Sciences, Materials Engineering, Materials Science +12
J.P. Espinós, J.J. Morales, Ángel Barranco et al. · The Journal of Physical Chemistry B · 2002 · 601 citations