Structure and conductivity of carbon materials produced from coal pitch with carbon additives
- Authors: Barnakov C.N.1, Khokhlova G.P.1, Popova A.N.1, Romanenko A.I.2, Bryantsev Y.A.2
-
Affiliations:
- Institute of Coal Chemistry and Materials Chemistry, Federal Research Center of Coal and Coal Chemistry, Siberian Branch
- Institute of Inorganic Chemistry
- Issue: Vol 60, No 7 (2017)
- Pages: 278-284
- Section: Chemistry
- URL: https://journals.rcsi.science/1068-364X/article/view/226301
- DOI: https://doi.org/10.3103/S1068364X1707002X
- ID: 226301
Cite item
Abstract
Attention focuses on the structure and electrical conductivity of carbon materials obtained by the carbonization of coal pitch in the presence of additives (nanotubes, graphite foam, and graphite), at temperatures up to 900°C. In some cases, ultrasonic mixing is used on introducing the additives to the pitch. Ultrasonic mixing is found to change the properties of the pitch and affect the properties of the carbon material produced. In particular, the proportion of carbon with an ordered structure is increased; the electrical conductivity at temperatures below 40 K is increased; and the energy barrier Eg between individual crystallites is reduced almost fourfold. At higher temperatures, the electrical conductivity is practically unchanged. Adding nanotubes to the pitch reduces the content of ordered carbon structures in the carbon material produced and lowers its electrical conductivity. Adding graphite foam and graphite to the pitch increases the order and electrical conductivity of the carbon material produced and lowers the energy barrier Eg between individual crystallites in the samples. The electrical conductivity of all the carbon materials below 16 K is described by the characteristic formula for fluctuation-induced tunneling conduction. This indicates that contacts between individual crystallites are mainly responsible for the electrical conductivity.
About the authors
Ch. N. Barnakov
Institute of Coal Chemistry and Materials Chemistry, Federal Research Center of Coal and Coal Chemistry, Siberian Branch
Author for correspondence.
Email: barnakov@rambler.ru
Russian Federation, Kemerovo
G. P. Khokhlova
Institute of Coal Chemistry and Materials Chemistry, Federal Research Center of Coal and Coal Chemistry, Siberian Branch
Email: barnakov@rambler.ru
Russian Federation, Kemerovo
A. N. Popova
Institute of Coal Chemistry and Materials Chemistry, Federal Research Center of Coal and Coal Chemistry, Siberian Branch
Email: barnakov@rambler.ru
Russian Federation, Kemerovo
A. I. Romanenko
Institute of Inorganic Chemistry
Email: barnakov@rambler.ru
Russian Federation, Novosibirsk
Ya. A. Bryantsev
Institute of Inorganic Chemistry
Email: barnakov@rambler.ru
Russian Federation, Novosibirsk