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Title: Exploring the alignment of carbon nanotubes dispersed in a liquid crystal matrix using coplanar electrodes

We report on the use of a liquid crystalline host medium to align single-walled carbon nanotubes in an electric field using an in-plane electrode configuration. Electron microscopy reveals that the nanotubes orient in the field with a resulting increase in the DC conductivity in the field direction. Current versus voltage measurements on the composite show a nonlinear behavior, which was modelled by using single-carrier space-charge injection. The possibility of manipulating the conductivity pathways in the same sample by applying the electrical field in different (in-plane) directions has also been demonstrated. Raman spectroscopy indicates that there is an interaction between the nanotubes and the host liquid crystal molecules that goes beyond that of simple physical mixing.
Authors:
 [1] ;  [2] ; ; ; ; ; ; ;  [1] ; ;  [3]
  1. School of Engineering and Computing Sciences and Centre for Molecular and Nanoscale Electronics, Durham University, South Road, Durham DH1 3LE (United Kingdom)
  2. (Brazil)
  3. Department of Chemistry, Durham University, South Road, Durham DH1 3LE (United Kingdom)
Publication Date:
OSTI Identifier:
22399354
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALIGNMENT; CARBON NANOTUBES; ELECTRIC CONDUCTIVITY; ELECTRIC FIELDS; ELECTRIC POTENTIAL; ELECTRODES; ELECTRON MICROSCOPY; LIQUID CRYSTALS; MATRIX MATERIALS; NONLINEAR PROBLEMS; RAMAN SPECTROSCOPY; SPACE CHARGE