Molecular orientation and photorefractive effects in single-wall carbon nanotubes doped nitrile-ester mixture liquid crystals


Köysal O., Okutan M. , San S. E. , Dabrowski R., Ecevit F. N.

MATERIALS CHEMISTRY AND PHYSICS, vol.109, pp.253-256, 2008 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 109
  • Publication Date: 2008
  • Doi Number: 10.1016/j.matchemphys.2007.11.017
  • Title of Journal : MATERIALS CHEMISTRY AND PHYSICS
  • Page Numbers: pp.253-256

Abstract

We report the electro-optical properties of liquid crystal cells containing pure nitrile-ester mixture liquid crystal (NEMLC) and its doped form with 0.05% (wt/wt) single-wall carbon nanotubes (SWCNT). Diffraction efficiencies of 441-nm pump and 632-nm probe beams were measured in two-wave mixing experiment. Efficiencies and rise time were found to increase in SWCNT doped nematic liquid crystals. A maximum diffraction efficiency of similar to 15% was found for cell doped with SWCNT, while cells without SWCNT had a maximum efficiency of 7%. We also have observed that photoconductivity in SWCNT doped liquid crystals is highly dependent on the light intensity. This is attributed to the doping, which enhances the efficient photo-charge generation, combined with enlarged conductivity. (C) 2007 Elsevier B.V. All rights reserved.