The influence of oxide buffer layers on the formation of catalytic nanoparticles and carbon nanotubes
Khudaykulov I. Kh.1, Rakhimov A. A.1, Ismatov A. A.1, Adilov M. M.1
1Institute of Ion-Plasma Technologies, Academy of Sciences of Uzbekistan, Tashkent, Uzbekistan
Email: i_khudaykulov@mail.ru
The morphology of Ni nanoparticles synthesized on SiO2 and TiO2 buffer layers, as well as carbon nanotubes grown on them, was studied. Scanning electron microscopy and transmission electron microscopy analysis revealed that nanoparticles formed on the TiO2 surface have increased size and low surface density, which leads to the formation of a limited number of carbon nanotube nuclei and reduced homogeneity. In contrast, nanoparticles on the SiO2 surface have a smaller average diameter, a nearly spherical shape, a uniform distribution, and are characterized by high density. As a result, the synthesized carbon nanotubes are characterized by an ordered structure, a narrow diameter range (5-25 nm), and a high level of crystallinity. These results allow us to recommend the SiO2 buffer layer as an effective catalyst platform. Keywords: Carbon nanotubes, buffer layers, nanoparticles, CVD synthesis, morphology, transmission electron microscopy, scanning electron microscopy, crystallinity, amorphous carbon, catalytic particles.
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