2015/09/02 by Paul Bazylewski, P. Bazylewski, Danil W. Boukhvalov +21
Chemistry · Materials Science · Physics and Astronomy · #Carbon Nanotubes in Composites #Chemical Physics (physics.chem-ph) #Computational Physics (physics.comp-ph) #FOS: Physical sciences #Graphene research and applications #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Nanomaterials for catalytic reactions #cond-mat.mes-hall #cond-mat.mtrl-sci #physics.chem-ph #physics.comp-ph
paper · pdf · doi:10.48550/arxiv.1509.00575
20 pages, 8 figures, accepted to RSC Advances. arXiv admin note: text overlap with arXiv:1411.3611
arxiv created 2015/09/02 · openalex publication_date 2015/09/02 · arxiv updated 2015/09/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The results of density functional theory calculations and measurements using X-ray photoelectron spectroscopy of Co-nanoparticles dispersed on graphene/Cu are presented. It is found that for low cobalt thickness (0.02 nm - 0.06 nm) the Co forms islands distributed non-homogeneously which are strongly oxidized under exposure to air to form cobalt oxides. At greater thicknesses up to 2 nm the upper Co-layers are similarly oxidized whereas the lower layers contacting the graphene remain metallic. The measurements indicate a Co2+ oxidation state with no evidence of a 3+ state appearing at any Co thickness, consistent with CoO and Co[OH]2. The results show that thicker Co (2nm) coverage induces the formation of a protective oxide layer while providing the magnetic properties of Co nanoparticles.