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Materials chemistry and physics v.211, 2018년, pp.258 - 263  

Observation of power-law behavior in temperature dependent conductivity of multiwall carbon nanotube/polystyrene composites

Bhatia, Ravi    (Department of Physics, Guru Jambheshwar University of Science and Technology, Hisar, 125001, India   ); Sameera, I.    (College of Physical Science and Technology, Sichuan University, Chengdu, 610064, China   ); Prasad, V.    (Department of Physics, Indian Institute of Science, Bangalore, 560012, India   ); Menon, Reghu    (Department of Physics, Indian Institute of Science, Bangalore, 560012, India  );
  • 초록  

    Abstract For last two decades, a pronounced temperature dependence of electrical conductivity ( σ ) in the multiwall carbon nanotube (MWCNT) - based polymer composite (even above the percolation threshold) has been widely reported; the conduction mechanism has been understood by employing conventional models, namely variable range hopping and fluctuation induced tunneling. Herein, we report on the observation of a weak temperature dependence of σ in the MWCNT/polystyrene composites above percolation threshold (0.7–7 wt %) at temperatures down to 1.4 K, with a conductivity ratio smaller than 3. The low temperature conductivity data follow power-law exhibiting two slope behavior, with exponent values β 1 ∼0.10–0.14 (at T > 5 K) and β 2 ∼0.23–0.36 (at T σ is attributed to high aspect ratio (more than 4000), achievement of high degree of dispersion, and excellent electrical properties of MWCNT as well as optimized composite processing. Further, all the samples exhibit negative magnetoresistance which can be explained within the framework of weak localization model. Highlights Temperature dependence of conductivity (300–1.4 K) of MWCNT/PS composites is studied. Conductivity of MWCNT/PS composites exhibit weak temperature dependence. Conductivity ratio ( σ r ) is smaller than 3 for all samples. Power-law explains the conduction mechanism in the low temperature regime. Previous similar measurements resulted a pronounced temperature dependence with σ r ∼500. Graphical abstract [DISPLAY OMISSION]


  • 주제어

    Multiwall carbon nanotube .   Percolative systems .   Electrical conductivity.  

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