Abstract

Polarized Raman microspectroscopy and atomic force microscopy were used to measure molecular orientation in individual diphenylalanine nanotubes (diameters ranging from 100nm to 1000nm). Analysis of the amide I Raman bands (1686cm−1) indicated that the C═O side chains have a parallel alignment with the nanotube axis. The amide III Raman band (1249cm−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 (1002cm−1) indicated a rather random orientation. These results support the theoretical molecular structure models proposed recently.

© 2010 Optical Society of America

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