Utilize este identificador para referenciar este registo: http://hdl.handle.net/10773/19512
Título: Probing ferroelectric behaviour in charge-transfer organic meta-nitroaniline
Autor: Isakov, Dmitry
Vasilev, Semen
Gomes, Etelvina de Matos
Almeida, Bernardo
Shur, Vladimir Ya
Kholkin, Andrei L.
Palavras-chave: PIEZORESPONSE FORCE MICROSCOPY
MOLECULAR-CRYSTALS
THIN-FILMS
GLYCINE
MORPHOLOGY
MNA
Data: 2016
Editora: AMER INST PHYSICS
Resumo: 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.
Peer review: yes
URI: http://hdl.handle.net/10773/19512
DOI: 10.1063/1.4965710
ISSN: 0003-6951
Versão do Editor: 10.1063/1.4965710
Aparece nas coleções: CICECO - Artigos

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