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Critchley K, Cheadle EM, Zhang HL, et al. Surface plasmon Raman scattering studies of liquid crystal anchoring on liquid-crystal-based self-assembled monolayers. J Phys Chem B. 2009;113(47):15550-7doi: 10.1021/jp907497p.
Critchley, K., Cheadle, E. M., Zhang, H. L., Baldwin, K. J., Liu, Q., Cheng, Y., Fukushima, H., Tamaki, T., Batchelder, D. N., Bushby, R. J., & Evans, S. D. (2009). Surface plasmon Raman scattering studies of liquid crystal anchoring on liquid-crystal-based self-assembled monolayers. The journal of physical chemistry. B, 113(47), 15550-7. https://doi.org/10.1021/jp907497p
Critchley, Kevin, et al. "Surface plasmon Raman scattering studies of liquid crystal anchoring on liquid-crystal-based self-assembled monolayers." The journal of physical chemistry. B vol. 113,47 (2009): 15550-7. doi: https://doi.org/10.1021/jp907497p
Critchley K, Cheadle EM, Zhang HL, Baldwin KJ, Liu Q, Cheng Y, Fukushima H, Tamaki T, Batchelder DN, Bushby RJ, Evans SD. Surface plasmon Raman scattering studies of liquid crystal anchoring on liquid-crystal-based self-assembled monolayers. J Phys Chem B. 2009 Nov 26;113(47):15550-7. doi: 10.1021/jp907497p. PMID: 19921953.
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J Phys Chem B. 2009 Nov 26;113(47):15550-7. doi: 10.1021/jp907497p.

Surface plasmon Raman scattering studies of liquid crystal anchoring on liquid-crystal-based self-assembled monolayers.

The journal of physical chemistry. B

Kevin Critchley, Edward M Cheadle, Hao-Li Zhang, Kurt J Baldwin, Quanying Liu, Yaling Cheng, Hitoshi Fukushima, Takashi Tamaki, David N Batchelder, Richard J Bushby, Stephen D Evans

Affiliations

  1. School of Physics and Astronomy, University of Leeds, Leeds, LS2, 9JT, United Kingdom.

PMID: 19921953 DOI: 10.1021/jp907497p

Abstract

We studied the anchoring of 6CB on a series of self-assembled monolayers (SAMs) with a functional group that mimics that of the nematic liquid crystal (LC). The SAMs were first characterized by wetting, Fourier-transform infrared spectroscopy, and surface potential measurements. We found that, in two of these SAMs, the end group dipoles were oriented close to the normal of the surface and that these promoted homeotropic anchoring. In the case of the other SAM, the dipole was oriented parallel to the surface, and planar anchoring was obtained. Raman scattering by adsorbates on thin metal films is enhanced by the electromagnetic fields of surface plasmon polaritons (SPPs). Despite the inherent polarization of SPPs, there have been few reports in which SPP Raman scattering has been used to study molecular orientation. We have developed optical instrumentation to provide efficient excitation and collection of SPP Raman scattered light using attenuated total reflection geometry. The Kretschmann prism coupling configuration was used to excite SPPs on thin (500 A) gold films with adsorbed SAMs of alkanethiols in contact with thin films (50 microm) of the nematic liquid crystal 4'-hexylbiphenyl-4-carbonitrile (6CB, Merck). The anchoring and orientational wetting of the LC 6CB at the interface with omega-functionalized SAMs was studied using this arrangement. In agreement with the results of previous studies, a high-energy surface (-COOH) was found to promote planar anchoring, whereas a low-energy surface (-CF(3)) was found to induce homeotropic anchoring.

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