Optics and Spectroscopy

, Volume 120, Issue 2, pp 250–254 | Cite as

Investigation of orientational order in a nematic liquid crystal with semiconductor CdSe/Zns QDs by IR spectroscopy

Condensed-Matter Spectroscopy
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Abstract

The dichroic ratio and orientational-order parameter of fundamental bands have been studied in the IR spectrum for a nematic liquid crystal based on alkylcyanobiphenyls and its suspensions with semiconductor CdSe/ZnS QDs with a core size of 5 nm. Analyses have been performed by the method of multiple frustrated total internal reflection. It is shown that an increase in the nanoparticle concentration from 0.5 to 1.3 wt % improves the orientation uniformity of the liquid crystal near the interface with the orienting surface. The orientational order parameter in a suspension with 1.3 wt % QDs has increased in comparison with the initial liquid crystal by more than 10% for the fundamental bands in alkylcyanobiphenyl molecules, the stretching vibrations of which correspond to the direction of their long axes.

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Copyright information

© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • E. A. Konshina
    • 1
  • E. O. Gavrish
    • 1
  • A. I. Vangonen
    • 2
  1. 1.ITMO UniversitySt. PetersburgRussia
  2. 2.Vavilov State Optical InstituteSt. PetersburgRussia

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