Polarization switching and patterning in self-assembled peptide tubular structures
authors Bdikin, I; Bystrov, V; Delgadillo, I; Gracio, J; Kopyl, S; Wojtas, M; Mishina, E; Sigov, A; Kholkin, AL
nationality International
journal JOURNAL OF APPLIED PHYSICS
keywords FIELD-EFFECT TRANSISTORS; HYDROPHOBIC DIPEPTIDES; BUILDING-BLOCKS; THIN-FILMS; NANOTUBES; NANOSTRUCTURES; PIEZOELECTRICITY; MICROSCOPY; FIBRILS
abstract Self-assembled peptide nanotubes are unique nanoscale objects that have great potential for a multitude of applications, including biosensors, nanotemplates, tissue engineering, biosurfactants, etc. The discovery of strong piezoactivity and polar properties in aromatic dipeptides [A. Kholkin, N. Amdursky, I. Bdikin, E. Gazit, and G. Rosenman, ACS Nano 4, 610 (2010)] opened up a new perspective for their use as biocompatible nanoactuators, nanomotors, and molecular machines. Another, as yet unexplored functional property is the ability to switch polarization and create artificial polarization patterns useful in various electronic and optical applications. In this work, we demonstrate that diphenylalanine peptide nanotubes are indeed electrically switchable if annealed at a temperature of about 150 degrees C. The new orthorhombic antipolar structure that appears after annealing allows for the existence of a radial polarization component, which is directly probed by piezoresponse force microscopy (PFM) measurements. Observation of the relatively stable polarization patterns and hysteresis loops via PFM testifies to the local reorientation of molecular dipoles in the radial direction. The experimental results are complemented with rigorous molecular calculations and create a solid background of electric-field induced deformation of aromatic rings and corresponding polarization switching in this emergent material. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3699202]
publisher AMER INST PHYSICS
issn 0021-8979
year published 2012
volume 111
issue 7
digital object identifier (doi) 10.1063/1.3699202
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000303282402118
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journal analysis (jcr 2019):
journal impact factor 2.286
5 year journal impact factor 2.138
category normalized journal impact factor percentile 54.87
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