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Synthesis of single-walled carbon nanotube networks using monodisperse metallic nanocatalysts encapsulated in reverse micelles

Gayduchenko Igor A. (National Research Centre “Kurchatov Institute”, Moscow, Russia)
Fedorov Georgy E. (National Research Centre “Kurchatov Institute”, Moscow, Russia)
Ibragimov Ramil A. (University of Electronic Technology (MIET), Center for probe microscopy and nanotechnology, National Research, Moscow, Zelenograd, Russia)
Stepanova Tatiana S. (National Research Centre “Kurchatov Institute”, Moscow, Russia)
Gazaliev Arsen S. (National Research Centre “Kurchatov Institute”, Moscow, Russia)
Vysochanskiy Nikolay A. (National Research Centre “Kurchatov Institute”, Moscow, Russia)
Bobrov Yuri A. (NT-MDT Co. Building , Zelenograd, Moscow, Russia)
Malovichko Anton M. (University of Electronic Technology (MIET), Center for probe microscopy and nanotechnology, National Research, Moscow, Zelenograd, Russia)
Sosnin Ilya M. (Togliatti State University, Togliatti, Russia + R&D “Nanomet” LCC., Samara region, Togliatti, Russia)
Bobrinetskiy Ivan I. (University of Electronic Technology (MIET), Center for probe microscopy and nanotechnology, National Research, Moscow, Zelenograd, Russia)

We report on a method of synthesis of single-walled carbon nanotubes percolated networks on silicon dioxide substrates using monodisperse Co and Ni catalyst. The catalytic nanoparticles were obtained by modified method of reverse micelles of bis-(2-ethylhexyl) sulfosuccinate sodium in isooctane solution that provides the nanoparticle size control in range of 1 to 5 nm. The metallic nanoparticles of Ni and Co were characterized using transmission electron microscopy (TEM) and atomic-force microscopy (AFM). Carbon nanotubes were synthesized by chemical vapor deposition of CH4/H2 composition at temperature 1000 °С on catalysts pre-deposited on silicon dioxide substrate. Before temperature treatment during the carbon nanotube synthesis most of the catalyst material agglomerates due to magnetic forces while during the nanotube growth disintegrates into the separate nanoparticles with narrow diameter distribution. The formed nanotube networks were characterized using AFM, scanning electron microscopy (SEM) and Raman spectroscopy. We find that the nanotubes are mainly single-walled carbon nanotubes with high structural perfection up to 200 μm long with diameters from 1.3 to 1.7 nm consistent with catalyst nanoparticles diameter distribution and independent of its material.

Keywords: carbon nanotube, nanoparticles, reverse micelle, chemical vapor deposition