Temperature-dependent raman spectroscopic study of the nematic liquid crystal 4-n-pentyl-4′-cyanobiphenyl

Dae Seung Kang, Ki Sun Kwon, Sung Il Kim, Myoung Seon Gong, Sung Seok A. Seo, Tae Won Noh, Sang Woo Joo

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The spectral behaviors of 4-n-pentyl-4′-cyanobiphenyl (5CB) have been studied by means of temperature-dependent Raman spectroscopy in the range between -70 and 70°C. The v(C≡N) bands in the Raman spectra were found splitting below the transition temperature from the solid to the nematic liquid crystalline phase at ∼24°C, suggesting the existence of solid crystalline polymorphism. The interfacial structures of 5CB on metal plate surfaces have been reexamined by surface-enhanced Raman scattering (SERS) at different temperatures. On Ag and Au, the asymmetric shapes of the v(C≡N) bands suggest that there should exist different binding schemes for 5CB on metal surfaces. These asymmetric bands in the v(C≡N) stretching region were found to vary in changing temperature.

Original languageEnglish
Pages (from-to)1136-1140
Number of pages5
JournalApplied Spectroscopy
Volume59
Issue number9
DOIs
StatePublished - Sep 2005

Keywords

  • 4-n-Pentyl-4′-cyanobiphenyl (5CB)
  • Adsorption
  • Ag
  • Au
  • SERS
  • Surface-enhanced Raman scattering
  • Temperature-dependent Raman

ASJC Scopus subject areas

  • Instrumentation
  • Spectroscopy

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