تقرير
The characterization of Co-nanoparticles supported on graphene
| العنوان: | The characterization of Co-nanoparticles supported on graphene |
|---|---|
| المؤلفون: | Bazylewski, P., Boukhvalov, D. W., Kukharenko, A. I., Kurmaev, E. Z., Hunt, A., Moewes, A., Lee, Y. H., Cholakh, S. O., Chang, G. S. |
| سنة النشر: | 2015 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Chemical Physics, Physics - Computational Physics |
| الوصف: | 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. Comment: 20 pages, 8 figures, accepted to RSC Advances. arXiv admin note: text overlap with arXiv:1411.3611 |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/1509.00575 |
| رقم الأكسشن: | edsarx.1509.00575 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |