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dc.contributor.authorMacovez, Roberto
dc.contributor.authorZachariah, Manesh
dc.contributor.authorRomanini, Michela
dc.contributor.authorZygouri, Panagiota
dc.contributor.authorGournis, Dimitrios
dc.contributor.authorTamarit Mur, José Luis
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear
dc.identifier.citationMacovez, R. [et al.]. Hopping conductivity and polarization effects in a fullerene derivative salt. "The journal of physical chemistry. Part C, nanomaterials and interfaces", 12 Juny 2014, vol. 118, núm. 23, p. 12170-12175.
dc.description.abstractImpedance spectroscopy is employed to probe the frequency-dependent conductivity and dielectric response of the C60O24Na 24 fulleride. The conduction properties of this organic material match the so-called universal behavior of the ac conductivity in disordered media [Dyre, J. C.; Schroder, T. B. Rev. Mod. Phys. 2000, 72, 873-892]. In the whole temperature range studied, electrical conduction is due to intermolecular hopping processes of electronic charge carriers, characterized by an effective activation energy ranging between 0.7 eV at room temperature and 0.9 eV at 475 K. A single dielectric loss feature is observed, associated with the hopping of charge carriers surrounded by a polarization cloud. The polarizability of the material is mainly due to the distortion of the ionic O-Na bonds of the fullerene derivative, which are tight enough that no ionic contribution to the conductivity is observed up to the highest temperature probed (550 K). © 2014 American Chemical Society.
dc.format.extent6 p.
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.subjectÀrees temàtiques de la UPC::Energies::Energia elèctrica
dc.subjectÀrees temàtiques de la UPC::Enginyeria dels materials::Materials funcionals
dc.subject.lcshSpectrum analysis
dc.subject.otherConduction properties
dc.subject.otherEffective activation energy
dc.subject.otherElectrical conduction
dc.subject.otherFrequency dependent conductivity
dc.subject.otherFullerene derivative
dc.subject.otherHopping conductivity
dc.subject.otherImpedance spectroscopy
dc.subject.otherIntermolecular hopping
dc.titleHopping conductivity and polarization effects in a fullerene derivative salt
dc.contributor.groupUniversitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (published version)
local.citation.authorMacovez, R.; Zachariah, M.; Romanini, M.; Zygouri, P.; Gournis, D.; Tamarit, J. Ll.
local.citation.publicationNameThe journal of physical chemistry. Part C, nanomaterials and interfaces

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