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Issue 45, 2010
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PbS/CdS nanocrystal-sensitized titanate network films: enhanced photocatalytic activities and super-amphiphilicity

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Abstract

Titanate network films were grown in situ on a Ti foil by a fast microwave-assisted hydrothermal method. The titanate network (STN) films were formed by twisting of long one dimensional (1D) multi-walled titanate nanotubes. Compared with the traditional hydrothermal method, the applied microwaves can accelerate the reaction rate and this method can save time. To expand the light absorption capability, PbS and CdS nanocrystals were uniformly sensitized on the STN film. After sensitization, the light absorption was remarkably shifted to the long wavelength direction, while the network structures of the film were kept. The PbS-STN and CdS-STN films showed enhanced photocatalytic activities for MO degradation compared to the bare STN film and N-TiO2 film. These enhanced photocatalytic activities were possibly due to the large BET surface areas of the titanate nanotubes, more light harvesting in the channels of the surface network structure, and the high separation probability of the photo-generated electron–hole pairs. Furthermore, it is interesting that all of the STN, PbS-STN, and CdS-STN films showed the super-amphiphilicity without any light irradiation, which may be due to the roughness of the surface network structures. And this super-amphiphilicity was kept even after exposure to air for more than 6 months.

Graphical abstract: PbS/CdS nanocrystal-sensitized titanate network films: enhanced photocatalytic activities and super-amphiphilicity

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Publication details

The article was received on 04 Jul 2010, accepted on 16 Aug 2010 and first published on 29 Sep 2010


Article type: Paper
DOI: 10.1039/C0JM02111C
Citation: J. Mater. Chem., 2010,20, 10187-10192
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    PbS/CdS nanocrystal-sensitized titanate network films: enhanced photocatalytic activities and super-amphiphilicity

    Q. Li, T. Kako and J. Ye, J. Mater. Chem., 2010, 20, 10187
    DOI: 10.1039/C0JM02111C

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