TY - JOUR ID - 15149 TI - Nucleation and growth of carbon nanoforms on the surface of metallic plate-substrates and the mechanism of their doping with the clusters of ferromagnetic atoms   JO - Advanced Materials Letters JA - AML LA - en SN - 0976-3961 AU - Kutelia, E. AU - Rukhadze, L. AU - Dzigrashvili, T. AU - Tsurtsumia, O. AU - Gventsadze, D. AD - Y1 - 2018 PY - 2018 VL - 9 IS - 12 SP - 867 EP - 871 KW - Doped CNFs KW - clusters KW - growth mechanism KW - metal plate KW - substrate KW - SEM KW - EDX DO - 10.5185/amlett.2018.2144 N2 - The present work deals with the special experiments on SEM-EDX study of morphology, chemical composition and topological transformations of the initial ground surface of the bulk iron plate-substrate after its interaction with the ethanol vapor pyrolysis products at high temperatures in the closed-loop and open cycle reactors. Our experiments have shown that the mechanism of formation of Fe clusters-doped CNFs on plate-substrate surfaces may be represented as a process, the first stage of which is a protonation of the substrate subsurface layers caused by diffusion of hydrogen atoms facilitating the formation of 3D nano-groups of Fe atoms assembled in the characteristic clusters with magic numbers of atoms, depending on the thermodynamics of the metal. The spontaneous coalescence of these clusters into giant Fe-clusters at comparatively low temperatures and formation of iron nano-droplets at comparatively high temperatures results in the formation of a nanopatterned surface with the uniformly distributed catalytic centers of CNFs nucleation. The second stage of the process is a nanoparticle-guided growth through the VLS or VS (at low temperatures) growth mechanisms in which the one cluster provides nucleation of only one CNF particle so that the sizes of the nucleation centers determine the basic size of the CNF nanoparticles. UR - https://aml.iaamonline.org/article_15149.html L1 - https://aml.iaamonline.org/article_15149_6cbe2c33728f38d528af2bcc31d9b9f1.pdf ER -