EFFECT OF PORE SIZES OF Au ANTIDOT ARRAYS ON PHOTOCATALYSIS PERFORMANCE OF Au/TiO2 COMPOSITE FILMS
Revised date: 2014-04-04
Online published: 2014-10-25
Supported by
Supported by Innovation Foundation of Beijing Institute of Aeronautical Materials (No. KF53090315)
Au/TiO2 composite films with different pore sizes of antidot arrays are prepared by inversion replication of colloidal crystal templates. The microstructure and the photocatalysis performance of all samples are characterized by using SEM, AFM, XRD, UV-Vis and four-point probe. Relations between the coverage of antidot arrays on the surface of TiO2 films and the diameters of template microspheres are discussed through calculation on geometric model of colloidal crystal templates and antidot arrays. The results show that the pore size of Au antidot arrays significantly influences the photocatalysis performance of the composite films. With the pore size increasing, the conducting ability and the charge carriers transport efficiency enhances. This is responsible for the improvement of photocatalysis performance. At the same time, the recombination probability of photoinduced electrons and holes increases during the charge carrier migration with the pore size decreasing, which result in the decrease of the photocatalysis performance. The photocatalysis performance increases rapidly and then decreases gradually with the pore size increasing, which is the result of the aforementioned two aspects of factors. The photocatalysis performance of the composite films reaches the maximum value when the pore size of Au antidot arrays is 3.3 μm.
Key words： Au antidot array; TiO2; pore size; photocatalysis performance
Hongfei QI , Dabo LIU , Lejin TENG , Tianmin WANG , Fei LUO , Ye TIAN . EFFECT OF PORE SIZES OF Au ANTIDOT ARRAYS ON PHOTOCATALYSIS PERFORMANCE OF Au/TiO2 COMPOSITE FILMS[J]. Acta Metall Sin, 2014 , 50(10) : 1163 -1169 . DOI: 10.11900/0412.1961.2014.00163
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