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Temperature Dependence of Electrical Conductivity and Thermoelectric Power of Transparent SWCNT Films Obtained by Aerosol CVD Synthesis
Author(s) -
Romanenko Anatoly I.,
Bryantsev Yaroslav A.,
Yakovleva Galina E.,
Arkhipov Viacheslav E.,
Berdinsky Alexander S.,
Gusel'nikov Artem V.,
Okotrub Alexander V.
Publication year - 2018
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201700642
Subject(s) - materials science , seebeck coefficient , electrical resistivity and conductivity , thermoelectric effect , raman spectroscopy , variable range hopping , conductivity , carbon nanotube , atmospheric temperature range , electrical resistance and conductance , thermal conductivity , composite material , analytical chemistry (journal) , optics , thermodynamics , chemistry , thermal conduction , electrical engineering , physics , chromatography , engineering
The effect of pressing on temperature dependences of electrical conductivity σ( T ) and thermoelectric power (Seebeck effect) S of single‐walled carbon nanotubes (SWCNTs) transparent films on polyester substrate has been studied. σ( T ) has been described by the fluctuation‐induced tunneling model (FIT) conductance in the temperature range 20–298 K. At a temperature T < 20 K, three‐dimensional variable range hopping conductivity (VRHC) has been observed. Based on the estimation of current concentration n ≈10 20 cm −3 from VRHC dependence, it has been found that metallic SWCNTs have made the main contribution to conductivity at T < 20 K. The value n obtained from S has been similar to the value obtained from VRHC estimation. The energy barrier between SWCNTs has been changed by pressing of films. Such pressing has led to increase in the electrical conductivity of the film by two orders of magnitude at room temperature. The measurement of conductivity in the process of synthesis has allowed us to control the repeatability of results and select samples with the necessary resistance values. Raman and optical spectroscopy, SEM and TEM have been used to determine the structural and geometric characteristics of the SWCNTs.