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Microstructure and dielectric behaviour of carbon nanofibers-alumina nanocomposites

AuthorsFernández-García, Lucía ; Suárez, Marta ; Pecharromán, Carlos ; Menéndez, José Luis ; Petzelt, Jan; Savinov, Maxim
Issue Date2011
Citation8th International Workshop on Interfaces (2011)
AbstractCarbon nanofibers-Alumina (CNF-Al2O3) nanocomposites are interesting materials because it is possible to design materials with a very wide range of the ac conductivity values. Depending on the amount of CNF the ac conductiviy of these materials ranges bemeen 10(-4) and 10(-14) s/cm and, therefore, they may flnd applications as dissipative materials. In this study, CNF-Al2O3 nanocomposites, in which CNF content was varied between 1 and 4% volume, were synthesized following processing routes: in one case the CNF were ball-milled before mixing with alumina and in the ofher case raw CUNF were used. Depending on thr CNF procesing different microstructures were obtained. In the composites with ball-milled CNF tke scanning electron microscopy images show a homogeneous dispersion of the CNF while in be composites with raw CNF the nanofibers ane highly agglomerated. These differences Ln the microstructure confer the composites dfferent behaviours of ac conductivity: with raw CNF it is not possible to get a fine-tuning of the ac conductivity and the composites present large steps in ac conductivity values in samples with different amount of CNF. On the other hand, the ball-milled CNF composites show reproducible and well-controlled ac conductivity values in a small range, between 8.10(-7) y 9.10(-8) s/cm, at frequencies below 1Hz. The present work reports on the importance of the processing of CNF in the microstructure and the ac conductivity behaviour of the final nanocomposite.
DescriptionResumen del póster presentado al 8th International Workshop on Interfaces: "At the boundary between natural and synthetic materials", celebrado en Santiago de Compostela (España) del 26 de junio al 1 de julio de 2011.
Appears in Collections:(ICMM) Comunicaciones congresos
(CINN) Comunicaciones congresos
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