Abstract
The effect of high pressure on the Seebeck coefficient and temperature dependences of the electrical resistance of single-wall and double-walled carbon nanotubes was studied in order to detect phase transformations occurring in carbon nanotubes in the pressure range 4–46 GPa. Diamond anvil cells with conductive synthetic diamonds were used to create high pressures. We observed a number of features associated with the structure changes of nanotubes. Temperature dependences of the electrical resistance of single and double-walled carbon nanotubes have the form characteristic of nondegenerate semiconductors. Analysis of results indicates the destruction of the structure of carbon nanotubes at high pressure.
Highlights
Carbon nanotubes are the subjects of numerous experimental and theoretical studies since its discovery by Iijima in 1991 [1]
The effect of high pressure on the Seebeck coefficient and temperature dependences of the electrical resistance of single-wall and double-walled carbon nanotubes was studied in order to detect phase transformations occurring in carbon nanotubes in the pressure range 4–46 GPa
In the configuration, we use the sign of the Seebeck coefficient, and its value corresponds to the electronic type of charge carriers, which is typical for a semiconductor material
Summary
Carbon nanotubes are the subjects of numerous experimental and theoretical studies since its discovery by Iijima in 1991 [1]. Such attention of researchers is connected with great prospects of possible applications of carbon nanotubes in different fields of science and technology. There are many examples of creating various nanoscale devices based on carbon nanotubes [3, 4]. These structures attract such attention of researchers, first of all, because of the possibility of regulating the conductivity of the nanotube by changing it structure [5]
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