Physics – Condensed Matter – Materials Science
Scientific paper
2011-11-07
J. Phys. Chem. C, 2011, 115 (50), pp 24615-24620
Physics
Condensed Matter
Materials Science
16 pages, 6 figures, accepted in J. Phys. Chem. C
Scientific paper
10.1021/jp2085846
Electronic structure of nickel nanoparticles encapsulated in carbon was characterized by photoelectron, X-ray absorption, and X-ray emission spectroscopies. Experimental spectra are compared with the density of states calculated in the frame of the density functional theory. The carbon shell of Ni nanoparticles has been found to be multilayer graphene with significant (about 6%) amount of Stone--Wales defects. Results of the experiments evidence protection of the metallic nanoparticles from the environmental degradation by providing a barrier against oxidation at least for two years. Exposure in air for 2 years leads to oxidation only of the carbon shell of Ni@C nanoparticles with coverage of functional groups.
Boukhvalov Danil W.
Buling A.
Galakhov V. R.
Kurmaev Ernst Z.
Neumann Martin
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