Temperature-driven phase transformation in self-assembled diphenylalanine peptide nanotubes
authors Heredia, A; Bdikin, I; Kopyl, S; Mishina, E; Semin, S; Sigov, A; German, K; Bystrov, V; Gracio, J; Kholkin, AL
nationality International
journal JOURNAL OF PHYSICS D-APPLIED PHYSICS
keywords 2ND-HARMONIC GENERATION; MICROSCOPY; TRANSITION; POLYMORPHISM; PROBE
abstract Diphenylalanine (FF) peptide nanotubes (PNTs) represent a unique class of self-assembled functional biomaterials owing to a wide range of useful properties including nanostructural variability, mechanical rigidity and chemical stability. In addition, strong piezoelectric activity has recently been observed paving the way to their use as nanoscale sensors and actuators. In this work, we fabricated both horizontal and vertical FF PNTs and examined their optical second harmonic generation and local piezoresponse as a function of temperature. The measurements show a gradual decrease in polarization with increasing temperature accompanied by an irreversible phase transition into another crystalline phase at about 140-150 degrees C. The results are corroborated by the molecular dynamic simulations predicting an order-disorder phase transition into a centrosymmetric (possibly, orthorhombic) phase with antiparallel polarization orientation in neighbouring FF rings. Partial piezoresponse hysteresis indicates incomplete polarization switching due to the high coercive field in FF PNTs.
publisher IOP PUBLISHING LTD
issn 0022-3727
year published 2010
volume 43
issue 46
digital object identifier (doi) 10.1088/0022-3727/43/46/462001
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000283857000001
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