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 language | English |
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Pages (from-to) | 1136-1140 |
Number of pages | 5 |
Journal | Applied Spectroscopy |
Volume | 59 |
Issue number | 9 |
DOIs | |
State | Published - 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