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Applied Physics Letters / Volume 100 / Issue 4 / BIOPHYSICS AND BIO-INSPIRED SYSTEMS

Appl. Phys. Lett. 100, 043702 (2012); http://dx.doi.org/10.1063/1.3676417 (4 pages)

Evidence of ferroelectricity and phase transition in pressed diphenylalanine peptide nanotubes

Igor Bdikin1, Vladimir Bystrov2,3, Svitlana Kopyl1, Rui P. G. Lopes2, Ivonne Delgadillo4, José Gracio1, Elena Mishina5, Alexander Sigov5, and Andrei L. Kholkin2

1Centre for Mechanical Technology and Automation (TEMA), University of Aveiro, 3810-193 Aveiro, Portugal
2Department of Ceramics and Glass Engineering and CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
3Institute of Mathematical Problems of Biology RAS, Puschino, 142290 Moscow District, Russia
4Department of Chemistry and QOPNAA, University of Aveiro, Aveiro, Portugal
5Moscow State Institute of Radioengineering, Electronics and Automation, 119454 Moscow, Russia

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(Received 4 October 2011; accepted 17 December 2011; published online 24 January 2012)

Self-assembled peptide nanotubes (PNT) are unique nanoscale objects having a great potential for a multitude of applications. Strong piezoactivity and polar properties in aromatic dipeptides were recently observed in stand-alone nanotubes using piezoresponse force microscopy and 2nd harmonic generation. In this work, we report macroscopic dielectric and polarization vs. field measurements on pressed PNTs before and after annealing at 150 °C. The results corroborate nanoscale study and present a clear evidence of ferroelectric-like behaviour and phase transition in this technologically important material. The dielectric constant of PNT pellets obeys apparent Curie-Weiss (CW) law with the CW constant C ≈ 230 °C and transition temperature at T ≈ 142 °C.

© 2012 American Institute of Physics

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KEYWORDS, PACS, and IPC

Keywords

annealing, dielectric polarisation, ferroelectric materials, ferroelectric transitions, nanotubes, organic compounds, permittivity, piezoelectricity, self-assembly

PACS

  • 77.80.B-

    Phase transitions and Curie point

  • 77.22.Ch

    Permittivity (dielectric function)

  • 77.22.Ej

    Polarization and depolarization

  • 81.16.Dn

    Self-assembly

  • 81.40.Gh

    Other heat and thermomechanical treatments

International Patent Classification (IPC)

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3676417

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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