Probing ferroelectric behaviour in charge-transfer organic meta-nitroaniline
authors Isakov, D; Vasilev, S; Gomes, ED; Almeida, B; Shur, VY; Kholkin, AL
nationality International
journal APPLIED PHYSICS LETTERS
keywords PIEZORESPONSE FORCE MICROSCOPY; MOLECULAR-CRYSTALS; THIN-FILMS; GLYCINE; MORPHOLOGY; MNA
abstract Potential ferroelectricity in charge-transfer organic materials is often masked by the intrinsic conductivity. Here, we report the compelling evidence of ferroelectricity in organic pi-conjugated meta-nitroaniline (m-NA) crystals as shown by the local electromechanical measurements using the piezoresponse force microscopy (PFM) technique. m-NA is a charge-transfer molecular material with the exceptional optical non-linearity and perceptible conductivity along the crystallographic polar axis. While standard Sawyer-Tower measurements revealed an apparently lossy-dielectric hysteresis, The PFM switching spectroscopy indicated clear ferroelectric behaviour in this technologically important multifunctional material. Further study of the pyroelectric properties in m-NA crystals confirmed their high spontaneous polarization of 18 mu C/cm(2) at room temperature, comparable to the best known organic ferroelectrics. Published by AIP Publishing.
publisher AMER INST PHYSICS
issn Mar-51
year published 2016
volume 109
issue 16
digital object identifier (doi) 10.1063/1.4965710
web of science category Physics, Applied
subject category Physics
unique article identifier WOS:000386933200030
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journal impact factor 3.495
5 year journal impact factor 3.386
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