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, cilt.109, ss.253-256, 2008 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 109
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1016/j.matchemphys.2007.11.017
  • Dergi Adı: MATERIALS CHEMISTRY AND PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.253-256
  • Yıldız Teknik Üniversitesi Adresli: Hayır

Özet

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.