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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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Publication details

The article was received on 31 Jul 2017, accepted on 11 Sep 2017 and first published on 11 Sep 2017


Article type: Communication
DOI: 10.1039/C7CP05186G
Citation: Phys. Chem. Chem. Phys., 2017,19, 26540-26544
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    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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