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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 35, Iss. 24 — Dec. 15, 2010
  • pp: 4193–4195

Nondestructive Raman and atomic force microscopy measurement of molecular structure for individual diphenylalanine nanotubes

Banyat Lekprasert, Victoria Sedman, Clive J. Roberts, Saul J. B. Tedler, and Ioan Notingher  »View Author Affiliations


Optics Letters, Vol. 35, Issue 24, pp. 4193-4195 (2010)
http://dx.doi.org/10.1364/OL.35.004193


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Abstract

Polarized Raman microspectroscopy and atomic force microscopy were used to measure molecular orientation in individual diphenylalanine nanotubes (diameters ranging from 100 nm to 1000 nm ). Analysis of the amide I Raman bands ( 1686 cm 1 ) indicated that the C O side chains have a parallel alignment with the nanotube axis. The amide III Raman band ( 1249 cm 1 ) associated with the peptide backbone C N vibrations showed that these bonds are preferentially aligned perpendicular to the nanotube axis. However, the Raman band corresponding to the symmetric breathing mode of the aromatic rings ( 1002 cm 1 ) indicated a rather random orientation. These results support the theoretical molecular structure models proposed recently.

© 2010 Optical Society of America

OCIS Codes
(170.5660) Medical optics and biotechnology : Raman spectroscopy
(300.0300) Spectroscopy : Spectroscopy
(180.5655) Microscopy : Raman microscopy

ToC Category:
Spectroscopy

History
Original Manuscript: October 14, 2010
Revised Manuscript: November 11, 2010
Manuscript Accepted: November 14, 2010
Published: December 14, 2010

Citation
Banyat Lekprasert, Victoria Sedman, Clive J. Roberts, Saul J. B. Tedler, and Ioan Notingher, "Nondestructive Raman and atomic force microscopy measurement of molecular structure for individual diphenylalanine nanotubes," Opt. Lett. 35, 4193-4195 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-24-4193


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