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

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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 100nm to 1000nm). Analysis of the amide I Raman bands (1686cm1) indicated that the CO side chains have a parallel alignment with the nanotube axis. The amide III Raman band (1249cm1) associated with the peptide backbone CN 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 (1002cm1) indicated a rather random orientation. These results support the theoretical molecular structure models proposed recently.

© 2010 Optical Society of America

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