Apparent colossal dielectric constants in nanoporous Metal Organic Frameworks
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Apparent colossal dielectric constants in nanoporous Metal Organic FrameworksAutor(es)
Fecha
2012-05-30Cita bibliográfica
Sánchez-Andújar, M., Yáñez-Vilar, S., Pato-Doldán, B., Gómez-Aguirre, C., Castro-García, S., & Señarís-Rodríguez, M. A. (2012). Apparent Colossal Dielectric Constants in Nanoporous Metal Organic Frameworks. The Journal of Physical Chemistry C, 116(24), 13026–13032. doi:10.1021/jp3026978
Resumen
[Abstract] In this work, we show that the hybrid material Co2(1,4-bdc)2(dabco)•[4DMF•1H2O], shows an apparent colossal dielectric constant at room temperature (r5000 at 300 K for =100 Hz). Nevertheless, such response does not imply colossal polarizability processes, as its dielectric constant is not purely intrinsic, but is greatly enhanced by the activation of extrinsic dielectric effects close to room temperature associated to the diffusion of numerous guest molecules through the channels. If such extrinsic contributions are eliminated or reduced, the values of the dielectric constant turn to be much smaller, as observed in the closely related Co2(1,4-bdc-NH2)2(dabco)•[7/2DMF•1H2O], Co2(1,4-ndc)2(dabco) •[3DMF•2H2O] and Ni2(1,4-bdc)2(dabco)•[3DMF•1/2H2O] compounds. Therefore, we warn about the imperious necessity of distinguishing between intrinsic and extrinsic effects in electrically inhomogenous MOF materials that display a certain conductivity in order to adequately interpret their dielectric behavior
Palabras clave
Colossal dielectric constant
Metal organic frameworks
Dielectric properties
Extrinsic contributions
Metal organic frameworks
Dielectric properties
Extrinsic contributions
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This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher.
To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://dx.doi.org/10.1021/jp3026978
ISSN
1932-7455