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Probing ferroelectric behaviour in charge-transfer organic meta-nitroaniline

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posted on 2020-07-21, 11:22 authored by Dmitry Isakov, Semen G. Vasilev, Etelvina de Matos Gomes, Bernardo Almeida, Vladimir Ya. Shur, Andrei L. Kholkin
Potential ferroelectricity in charge-transfer organic materials is often masked by the intrinsic conductivity. Here, we report the compelling evidence of ferroelectricity in organic π-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 μC/cm2 at room temperature, comparable to the best known organic ferroelectrics.

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The use and limitations of multiple pulse signals for estimation of flow system characteristics in the presence of noise

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Publication

Applied Physics Letters;109 (6)

Publisher

AIP Publishing

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peer-reviewed

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Copyright (year) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics The following article "Probing ferroelectric behaviour in charge-transfer organic meta-nitroaniline" appeared in Applied Physics Letters, 109 (6) and may be found at http://dx.doi.org/10.1063/1.4965710

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English

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