Ávila, H. A.Ramajo, L. A.Góes, M. S. [UNESP]Reboredo, M. M.Castro, M. S.Parra, R.2014-05-272014-05-272013-02-13ACS Applied Materials and Interfaces, v. 5, n. 3, p. 505-510, 2013.1944-82441944-8252http://hdl.handle.net/11449/74591Composite materials made of epoxy resin and barium titanate (BT) electrospun nanostructured fibers were prepared. BT fibers were synthesized from a sol based on barium acetate, titanium isopropoxide, and poly(vinyl pyrrolidone). The fibers were heat-treated at different temperatures and characterized by X-ray diffraction, scanning electron microscopy (SEM), and Raman spectroscopy. Mats of BT fibers heat-treated at 800 C were embedded in epoxy resin into suitable molds. The composites were characterized by SEM, and dielectric measurements were performed by means of dielectric spectroscopy. The dielectric permittivity and dielectric modulus of epoxy resin/BT-fiber composites were measured for two types of samples: with the electrodes parallel and perpendicular to the BT fiber layers. Interestingly, composite samples with electrodes perpendicular to the fiber layers and a BT content as low as 2 vol % led to dielectric permittivities three times higher than that of pure epoxy resin. © 2013 American Chemical Society.505-510engBaTiO3compositesdielectric permittivityelectrospinningepoxy resinBatioComposite samplesDielectric behaviorDielectric measurementsDielectric modulusDielectric permittivitiesElectrospunsNanostructured ceramicNanostructured fibersPoly vinyl pyrrolidoneTitanium IsopropoxideBarium titanateCeramic fibersComposite materialsElectrodesElectrospinningFibersPermittivityRaman spectroscopyResinsScanning electron microscopySolsX ray diffractionEpoxy resinsBarium CompoundsCeramic FibersCompositesDielectric ConstantDielectric PropertiesPolyepoxidesRaman SpectroscopyScanning Electron MicroscopyX Ray DiffractionArtigo10.1021/am302646zWOS:000315079700007Acesso restrito2-s2.0-84873631816