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In Situ Synthesis of CNTs/Cu Nanocomposites and the Electronic Transport Properties
Author(s) -
Wang Dongxing,
Li Da,
Muhammad Javid,
Zhou Yuanliang,
Shah Asif,
Dong Xinglong,
Zhang Zhidong
Publication year - 2019
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.201800557
Subject(s) - nanocomposite , carbon nanotube , materials science , variable range hopping , electrical resistivity and conductivity , dielectric , composite material , chemical engineering , nanotechnology , thermal conduction , optoelectronics , electrical engineering , engineering
Carbon nanotubes (CNTs)/Cu nanocomposite has been in situ fabricated by an arc‐discharge plasma approach. It is found that the herringbone‐bamboo‐shaped CNTs grow with assistance of Cu catalyst through an instantaneous vapor–liquid–solid (VSL) mechanism. Dielectric behavior dominates the electronic transport of CNTs/Cu nanocomposite, however, it is conductively modified by the metallic Cu nanoparticles, the residual catalyst exists in the nanocomposite. Temperature‐dependent resistivity of CNTs/Cu nanocomposite reveals that a transition from Mott–David (MD) variable range hopping (VRH) to Shklovskii–Efros (SE) VRH happens at the temperature of ≈10.7 K, which is further supported by theoretically calculated MD–SE crossover temperature T C = 10.6 K. The Coulomb gap Δ C = 0.14 meV is obtained for the CNTs/Cu nanocomposites, which is greatly significant to understand the conductive modification of CNTs by a metallic additive.