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High Resolution Piezoresponse Force Microscopy Study of Self-Assembled Peptide Nanotubes

Published online by Cambridge University Press:  27 December 2016

Maxim Ivanov*
Affiliation:
Department of Physics & CICECO – Aveiro Institute of Materials, University of Aveiro, Aveiro, 3810-193 PortugalMoscow Technological University MIREA, Moscow, 119454, Russian Federation
Ohheum Bak
Affiliation:
Department of Physics and Astronomy, University of Nebraska - Lincoln, NE 68588, United States
Svitlana Kopyl
Affiliation:
Department of Physics & CICECO – Aveiro Institute of Materials, University of Aveiro, Aveiro, 3810-193 Portugal
Semen Vasilev
Affiliation:
School of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, 620026, Russian Federation
Pavel Zelenovskiy
Affiliation:
School of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, 620026, Russian Federation
Vladimir Shur
Affiliation:
School of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, 620026, Russian Federation
Alexei Gruverman
Affiliation:
Department of Physics and Astronomy, University of Nebraska - Lincoln, NE 68588, United States
Andrei Kholkin
Affiliation:
Department of Physics & CICECO – Aveiro Institute of Materials, University of Aveiro, Aveiro, 3810-193 PortugalSchool of Natural Sciences and Mathematics, Ural Federal University, Ekaterinburg, 620026, Russian Federation
*
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Abstract

Peptide nanotubes based on short dipeptide diphenylalanine (FF) attract a lot of attention due to their unique physical properties ranging from strong piezoelectricity to extraordinary mechanical rigidity. In this work, we present the results of high-resolution Piezoresponse Force Microscopy (PFM) measurements in FF microtubes prepared from the solution. First in-situ temperature measurements show that the effective shear piezoelectric coefficient d15 (proportional to axial polarization) significantly decreases (to about half of the initial value) under heating up to 100 oC. The piezoresponse becomes inhomogeneous over the surface being higher in the center of the tubes. Further, PFM study of a composite consisting of FF microtubes and reduced graphene oxide (rGO) was performed. We show that piezoelectric properties of peptide microtubes are significantly modified and radial (vertical) piezoresponse appears in the presence of rGO as confirmed via PFM analysis. The results are rationalized in terms of molecular approach in which π – π molecular interaction between rGO and dipeptide is responsible for the appearance of radial component of polarization in such hybrid structures.

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Copyright
Copyright © Materials Research Society 2016 

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