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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
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Probing nonlinear optical coefficients in self-assembled peptide nanotubes.

Soma Khanra1, Kartik Ghosh2, Fabio F Ferreira3

  • 1Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA. guhas@missouri.edu yuping@missouri.edu.

Physical Chemistry Chemical Physics : PCCP
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Summary

Self-assembled diphenylalanine (FF) nanotubes exhibit strong piezoelectricity and nonlinear optical properties. Their optical coefficients are influenced by tube diameter and thermal treatment, offering tunable biomimetic materials.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Materials Science

Background:

  • Self-assembled l,l-diphenylalanine (FF) peptide nanotubes are biomimetic materials.
  • These nanotubes possess a non-centrosymmetric crystal structure and exhibit strong piezoelectricity.
  • Previous research has established their potential in various applications due to these properties.

Purpose of the Study:

  • To investigate the nonlinear optical (NLO) coefficients of individual FF nanotubes.
  • To determine the influence of tube diameter and thermal treatment on NLO properties.
  • To correlate NLO behavior with structural characteristics and water interactions.

Main Methods:

  • Synthesis of FF peptide nanotubes via a liquid phase method.
  • Second harmonic generation (SHG) polarimetry on individual nanotubes.
  • Concurrent Raman scattering measurements on individual nanotubes.

Main Results:

  • The ratio of shear to longitudinal NLO coefficients (d15/d33) increases with nanotube diameter.
  • A transverse NLO coefficient was found to be negative, with its magnitude increasing with diameter.
  • Thermal treatment mimicked the effect of increasing tube diameter on SHG polarimetry.
  • Raman scattering revealed diameter-dependent changes in the low-frequency region, indicating water effects.

Conclusions:

  • The nonlinear optical properties of FF nanotubes are tunable via diameter and thermal treatment.
  • These findings highlight the potential of FF nanotubes as advanced biomimetic materials with controllable optical responses.
  • Subtle water interactions play a role in the observed diameter-dependent phenomena.