Gipronickel Institute LLC, St. Petersburg, Russia

L. V. Biketova, Senior Researcher of Hydrometallurgy Laboratory, Candidate of Technical Sciences, e-mail: biketovaLV@nornik.ru
Yu. N. Lisakov, Senior Researcher of Hydrometallurgy Laboratory, Candidate of Technical Sciences, e-mail: lisakovYuN@nornik.ru
Yu. M. Pelikh, Leading Engineer of Pyrometallurgy Laboratory
N. P. Chuprynin, 2^nd Category Engineer of Hydrometallurgy Laboratory, e-mail: chupryninNP@nornik.ru

The morphological composition of catalytically growing carbon nanostructures formed under conditions of low-temperature conversion of hydrocarbon molecules is characterized by low quality of the structure due to their significant heterogeneity, since in addition to carbon nanotubes, this product also contains other carbon materials of various morphologies and sizes. The problem of purifying catalytically synthesized carbon nanotubes is aggravated by the simultaneous growth of different morphologies of the product in the same part of the reactor. Therefore, the issue of optimizing the conditions for more selective conversion of a hydrocarbon into a carbon nanotube, uniform in morphology and perfect in composition and structure, is quite relevant. In the carbonyl technology for the production of nickel and iron powders, carbon monoxide is used as a reaction gas and carrier gas, which can also serve as a source of carbon in the formation of carbon nanostructures, due to its ability to disproportionate with the release of carbon. The article presents the results of studies of carbon nanotube synthesis by the supergrowth method in chemical vapor deposition (CVD) using various metal substrates, carbon-containing materials (carbon monoxide, hydrocarbons) and organometallic catalysts. The technological scheme of a universal laboratory setup for studying the processes of obtaining carbon nanotubes is presented. The results of studying the obtained samples by scanning electron microscopy and transmission electron microscopy confirm the possibility of obtaining an array of vertically oriented carbon nanotubes using carbon monoxide as a carbon source.

1. Rodionov V. V., Myakishev A. M. Review of carbon nanotube applications in polymer composite materials. Sovremennye materialy, tekhnika i tekhnologii. 2019. No. 6. pp. 8–12.
2. Lishnikh M. A. Prerequisites for the use of carbon nanotubes. Vestnik nauki. 2022. No. 5, Vol. 1. pp. 178–183.
3. Hafner J. H., Bronikowski M. J., Azamian B. R., Nikolaev P. et al. Catalytic growth of single-wall carbon nanotubes from metal particles. Chemical Physics Letters. 1998. Vol. 296, Iss. 1-2. pp. 195–202.
4. Dyachkov P. N. Carbon nanotubes: structure, properties, applications. Moscow : Binom, 2006. 273 p.
5. Sidorenko D. S., Vovk A. V., Kutylev S. A., Kuzmicheva G. M. et al. Production and study of carbon nanotubes. Vestnik MITKhT. 2009. Vol. 4, No. 1. pp. 52–59.
6. Rakov E. G. Methods for obtaining carbon nanotubes. Uspekhi khimii (RAN). 2000. Vol. 69, No. 1. pp. 41–59.
7. Avtsinov I. A., Popov G. G. Problems of carbon nanotubes synthesis. Vestnik Voronezhskogo gosudarstvennogo tekhnicheskogo universiteta. 2010. Vol. 6, No. 10. pp. 68–71.
8. Besperstova G. S., Neverova M. A., Stepanov A. M., Burakova E. A. et al. Effect of catalyst composition on the characteristics of synthesized carbon nanotubes. Fundamentalnye issledovaniya. 2018. No. 12-1. pp. 9–14.
9. Karaeva A. R., Urvanov S. A., Kazennov N. V., Mitberg E. B. et al. Features of carbon nanotubes obtained in the presence of metallocenes of elements of group VIII. Izvestiya vuzov. Khimiya i khimicheskaya tekhnologiya. 2020. Vol. 63, No. 12. pp. 4–9.
10. Shlyapin D. A., Lavrenov A. V., Leontyeva N. N. Formation of carbon materials during oxidative pyrolysis of methane on resistive catalysts. Kinetika i kataliz. 2022. Vol. 63, No. 1. pp. 33–50.
11. Fursikov P. V., Tarasov B. P. Catalytic synthesis and properties of carbon nanofibers and nanotubes. Mezhdunarodny nauchny zhurnal “Аlternativnaya energetika i ekologiya”. 2004. No. 10 (18). pp. 24–40.
12. Baranov A. V., Maslov V. G., Orlova A. O., Fedorov A. V. Practical use of nanostructures: tutorial. Saint Petersburg : NIU ITMO, 2014. 102 p.
13. Rathinavel S., Priyadharshini K., Dhananjaya Panda. A review on carbon nanotube: An overview of synthesis, properties, functionalization, characterization, and the application. Materials Science and Engineering: B. 2021. Vol. 268. 115095.
14. Lakhdar Sidi Salah, Nassira Ouslimani, Dalila Bousba, Isabelle Huynen et al. Carbon nanotubes (CNTs) from synthesis to functionalized (CNTs) using conventional and new chemical approaches. Journal of Nanomaterials. 2021. Vol. 14. pp.1–31.
15. Takahiro Maruyama. Chapter 6 - Carbon nanotubes. Handbook of carbon-based nanomaterials. Micro and Nano Technologies. Elsevier, 2021. pp. 299–319.
16. Rao N., Singh R., Bashambu L. Carbon-based nanomaterials: Synthesis and prospective applications. Materials Today: Proceedings. 2021. Vol. 44, P. 1. pp. 608–614.
17. Popova A. A., Aliev R. E., Shubin I. N. Features of nanoporous carbon material synthesis. Advanced Materials & Technologies. 2020. No. 3. pp. 28–32.
18. Gubareva A. A., Kryuchkov M. V. Consideration of methods for studying carbon nanotubes. NefteGazoKhimiya. 2021. No. 1-2. pp. 17–21.