Porosity dependence of electron percolation in nanoporus TiO2 layers
Ver/ Abrir
Impacto
Scholar |
Otros documentos de la autoría: Bisquert, Juan; Ofir, Ashi; Dor, Snir; Grinis, Larisa; Zaban, Arie; Dittrich, Thomas
Metadatos
Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
comunitat-uji-handle4:
INVESTIGACIONMetadatos
Título
Porosity dependence of electron percolation in nanoporus TiO2 layersFecha de publicación
2008Editor
American Institute of PhysicsISSN
00219606Tipo de documento
info:eu-repo/semantics/articleVersión
info:eu-repo/semantics/acceptedVersionPalabras clave / Materias
Resumen
The electron diffusion coefficient at varying porosity has been determined in a series of
nanostructured TiO2 films of different initial thicknesses. The porosity was changed by applying
different pressures prior ... [+]
The electron diffusion coefficient at varying porosity has been determined in a series of
nanostructured TiO2 films of different initial thicknesses. The porosity was changed by applying
different pressures prior to sintering, thereby modifying the internal morphology of the films though
not their chemical and surface conditions. A systematic increase of the effective diffusion coefficient
was observed as the porosity was decreased, indicating the improvement of the internal connectivity
of the network of nanoparticles. The experimental results have been rationalized using percolation
theory. First of all, applying a power law dependence, the diffusion coefficient as a function of
porosity from different films collapsed in a single master curve. In addition, application of the
models of effective medium approximation EMA allows us to compare the experimental results
with previous data from Monte Carlo simulation. The different data show a similar dependence in
agreement with the EMA predictions, indicating that the geometrical effect of electron transport due
to variation of porous morphology in TiO2 nanoparticulate networks is well described by the
percolation concept [-]
Derechos de acceso
Copyright 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in BISQUERT, Juan. Porosity dependence of electron percolation in nanoporus TiO2 layers, 1980, núm. 128, p. 64703,
and may be found at http://jcp.aip.org/jcp/copyright.jsp
http://rightsstatements.org/vocab/InC/1.0/
info:eu-repo/semantics/openAccess
http://rightsstatements.org/vocab/InC/1.0/
info:eu-repo/semantics/openAccess
Aparece en las colecciones
- FCA_Articles [501]