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Porosity dependence of electron percolation in nanoporus TiO2 layers
dc.contributor.author | Bisquert, Juan | |
dc.contributor.author | Ofir, Ashi | |
dc.contributor.author | Dor, Snir | |
dc.contributor.author | Grinis, Larisa | |
dc.contributor.author | Zaban, Arie | |
dc.contributor.author | Dittrich, Thomas | |
dc.date.accessioned | 2010-03-30T07:09:46Z | |
dc.date.available | 2010-03-30T07:09:46Z | |
dc.date.issued | 2008 | |
dc.identifier.issn | 00219606 | |
dc.identifier.uri | http://hdl.handle.net/10234/10033 | |
dc.description.abstract | 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 | |
dc.format.extent | 10 p. | |
dc.language.iso | eng | |
dc.publisher | American Institute of Physics | |
dc.relation.isPartOfSeries | The Journal of chemical physics; núm. 128 | |
dc.rights | 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 | |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | * |
dc.subject.other | Física | |
dc.title | Porosity dependence of electron percolation in nanoporus TiO2 layers | |
dc.type | info:eu-repo/semantics/article | |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | |
dc.type.version | info:eu-repo/semantics/acceptedVersion |
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