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Issue 39, 2017
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Diffusion of single dye molecules in hydrated TiO2 mesoporous films

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Abstract

Mesoporous oxide films are attractive frameworks in technological areas such as catalysis, sensing, environmental protection, and photovoltaics. Herein, we used fluorescence correlation spectroscopy to explore how the pore dimensions of hydrated TiO2 mesoporous calcined films modulate the molecular diffusion. Rhodamine B molecules in mesoporous films follow a Fickian process 2–3 orders slower compared to the probe in water. The mobility increases with the pore and neck radii reaching an approximately constant value for a neck radius >2.8 nm. However, the pore size does not control the dye diffusion at low ionic strength emphasizing the relevance of the probe interactions with the pore walls on dye mobility. In conclusion, our results show that the thermal conditioning of TiO2 mesoporous films provides an exceptional tool for controlling the pore and neck radii on the nanometer scale and has a major impact on molecular diffusion within the mesoporous network.

Graphical abstract: Diffusion of single dye molecules in hydrated TiO2 mesoporous films

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Supplementary files

Article information


Submitted
31 Jul 2017
Accepted
11 Sep 2017
First published
11 Sep 2017

Phys. Chem. Chem. Phys., 2017,19, 26540-26544
Article type
Communication

Diffusion of single dye molecules in hydrated TiO2 mesoporous films

J. F. Angiolini, M. Stortz, P. Y. Steinberg, E. Mocskos, L. Bruno, G. Soler-Illia, P. C. Angelomé, A. Wolosiuk and V. Levi, Phys. Chem. Chem. Phys., 2017, 19, 26540
DOI: 10.1039/C7CP05186G

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