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Journal of Nanotechnology
Volume 2016, Article ID 8034985, 5 pages
http://dx.doi.org/10.1155/2016/8034985
Research Article

Effect of Electrochemical Treatment on Electrical Conductivity of Conical Carbon Nanotubes

1Zavoisky Physical-Technical Institute, The Russian Academy of Sciences, Sibirsky Trakt 10/7, Kazan 420029, Russia
2Kazan State Power Engineering University, Krasnoselskaya 51, Kazan 420066, Russia

Received 30 June 2016; Revised 20 October 2016; Accepted 26 October 2016

Academic Editor: Valery Khabashesku

Copyright © 2016 S. M. Khantimerov et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Interaction of conical carbon nanotubes (CNTs) with hydrogen during electrochemical treatment and its effect on their electronic properties was studied. The temperature dependencies of electroconductivity of initial and electrochemically hydrogenated conical CNTs were investigated by using four-probe van der Pauw method. The studies revealed that the electrochemical hydrogen absorption leaded to a significant reduction in the electroconductivity of conical carbon nanotubes. We assume that these changes can be associated with a decrease in the concentration of charge carriers as a result of hydrogen localization on the carbon π-orbitals, the transition from sp2 to sp3 hybridization of conical CNTs band structure, and, therefore, a metal-semiconductor-insulator transition.