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- W2039720400 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." @default.
- W2039720400 created "2016-06-24" @default.
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- W2039720400 date "2008-02-11" @default.
- W2039720400 modified "2023-10-10" @default.
- W2039720400 title "Porosity dependence of electron percolation in nanoporous TiO2 layers" @default.
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- W2039720400 doi "https://doi.org/10.1063/1.2837807" @default.
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