Artículo
Electrical conduction mechanisms in graphene nanoplatelet/yttria tetragonal zirconia composites
Autor/es | Poyato Galán, Rosalía
Osuna, J. Morales Rodríguez, Ana Gallardo López, Ángela María |
Departamento | Universidad de Sevilla. Departamento de Física de la Materia Condensada |
Fecha de publicación | 2018-08 |
Fecha de depósito | 2023-12-27 |
Publicado en |
|
Premios | Premio Mensual Publicación Científica Destacada de la US. Facultad de Física |
Resumen | Yttria tetragonal zirconia polycrystalline (3YTZP) ceramic composites with 5, 10 and 20 vol% graphene nanoplatelets (GNPs) were prepared by spark plasma sintering (SPS) and their electrical conductivity as a function ... Yttria tetragonal zirconia polycrystalline (3YTZP) ceramic composites with 5, 10 and 20 vol% graphene nanoplatelets (GNPs) were prepared by spark plasma sintering (SPS) and their electrical conductivity as a function of temperature was characterized. The composites exhibit anisotropic microstructures so the electrical conductivity studies were carried out in two directions: perpendicular (σ⊥) and parallel (σ||) to the SPS pressing axis. The composites with 5 and 10 GNP vol% showed high electrical anisotropy, whereas the composite with 20 GNP vol % exhibited nearly isotropic electrical behavior. σ⊥ shows metallic-type behavior in the composites with 10 and 20 vol% GNP revealing that charge transport takes place through defect-free GNPs. For the composite with 5 vol % GNP the observed semiconductor-type behavior was explained by a two dimensional variable range hopping mechanism. σ|| shows metallic-type conductivity in the composite with 20 GNP vol% and positive dσ||/dT slope in the composites with 5 and 10 GNP vol%. |
Agencias financiadoras | Ministerio de Economía y Competitividad (MINECO). España European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER) |
Identificador del proyecto | MAT2015-67889-P |
Cita | Poyato Galán, R., Osuna, J., Morales Rodríguez, A. y Gallardo López, Á.M. (2018). Electrical conduction mechanisms in graphene nanoplatelet/yttria tetragonal zirconia composites. Ceramics International, 44 (12), 14610-14616. https://doi.org/10.1016/j.ceramint.2018.05.082. |
Ficheros | Tamaño | Formato | Ver | Descripción |
---|---|---|---|---|
CERI-2018_accepted.pdf | 640.5Kb | [PDF] | Ver/ | Versión aceptada |