EFFECT OF PORE SIZES OF Au ANTIDOT ARRAYS ON PHOTOCATALYSIS PERFORMANCE OF Au/TiO2 COMPOSITE FILMS

doi:10.11900/0412.1961.2014.00163

Acta Metall Sin

2014, Vol. 50

Issue (10): 1163-1169 DOI: 10.11900/0412.1961.2014.00163

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EFFECT OF PORE SIZES OF Au ANTIDOT ARRAYS ON PHOTOCATALYSIS PERFORMANCE OF Au/TiO₂ COMPOSITE FILMS

QI Hongfei¹(

), LIU Dabo¹, TENG Lejin¹, WANG Tianmin², LUO Fei¹, TIAN Ye¹

1 Department of Steel and Rare-Noble Metals, AVIC Beijing Institute of Aeronautical Materials, Beijing 100095
2 Center of Condensed Matter and Material Physics, Beihang University, Beijing 100191

Cite this article:

QI Hongfei, LIU Dabo, TENG Lejin, WANG Tianmin, LUO Fei, TIAN Ye. EFFECT OF PORE SIZES OF Au ANTIDOT ARRAYS ON PHOTOCATALYSIS PERFORMANCE OF Au/TiO₂ COMPOSITE FILMS. Acta Metall Sin, 2014, 50(10): 1163-1169.

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Abstract

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

ZTFLH:	TG146.3
	TQ034

Fund: Supported by Innovation Foundation of Beijing Institute of Aeronautical Materials (No. KF53090315)

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	Hongfei QI
	Dabo LIU
	Lejin TENG
	Tianmin WANG
	Fei LUO
	Ye TIAN

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https://www.ams.org.cn/EN/10.11900/0412.1961.2014.00163 OR https://www.ams.org.cn/EN/Y2014/V50/I10/1163

Fig.1 Schematic diagram of Au/TiO₂ composite film

Fig.2 SEM images of TiO₂ film (a) and monolayer colloid crystals (b)

Fig.3 XRD pattern of TiO₂ films

Fig.4 SEM images of Au antidot arrays in pore sizes of 1.3 μm (a), 2.3 μm (b), 3.3 μm (c), 4.2 μm (d) and 5.6 μm (e)

Fig.5 Ultraviolet-visible absorption spectra of initial methylene blue solution (a) and methylene blue solution degraded by photocatalysts for 1 h (b)

Fig.6 Relationships between degradation rate and pore size of antidot arrays

Fig.7 Geometry structure of colloidal crystal templates (a) and antidot arrays (b) (d₁—diameter of PS microsphere, d₂—diameter of antidot arrays, r—microgrid spacing of antidot arrays)

Fig.8 Sheet resistance of Au/ TiO₂ with different pore sizes

Fig.9 AFM image of Au/ TiO₂ with pore size of 2.3 μm (a) and height of antidot arrays along the line in Fig.9a (b)

Fig.10 Relationships between height of antidot arrays and diameter of PS particles

Fig.11 Schematic diagram of charge carrier migration in the pore of antidot arrays

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