Photocatalytic Activity of Cu2O and Bilayer Cu2O/TiO2 Films Prepared by Magnetron Sputtering

doi:10.3724/SP.J.1077.2012.00395

Abstract

Abstract:

Cu₂O, TiO₂ and composite Cu₂O/TiO₂ films were deposited on slide glass by direct current (DC) reactive magnetron sputtering. X-ray diffraction (XRD), scanning electron microscope (SEM) and energy-dispersive spectrometry (EDS) were applied to characterize crystal structure, morphology and composition of the films, respectively. Photocatalytic activity was evaluated by the degradation of methylene blue (MB) with Xenon lamp. XRD results show that besides the initial (111) crystal plane at sputtering time of 5 min, (110) and (220) crystal planes gradually develop on the Cu₂O film with the increase of sputtering time. Our calculation result indicates that (111) crystal plane is more beneficial to absorption of O₂than other crystal planes. The photocatalytic activity of the Cu₂O/TiO₂ composite films first increases with increasing Cu₂O-deposited content, and then reaches the highest value when the deposited content of Cu₂O is 2.6mol%, and successively undergoes a drop. The enhancement of the photocatalytic activity is mainly attributed to alleviate the recombination of electron-hole pairs. Excessive Cu₂O will prolong the time for transferring of electrons to Cu₂O/TiO₂interface and holes to surface, which increases the recombination probability of electrons and holes, and thus reduces the quantum efficiency.

Key words: magnetron sputtering, cuprous oxide, composite films, photocatalytic

CLC Number:

O643

LIU Can, WEI Zi-Dong, ZHANG Qian, HU Bao-Shan, QI Xue-Qiang, CHEN Si-Guo, DING Wei. Photocatalytic Activity of Cu₂O and Bilayer Cu₂O/TiO₂ Films Prepared by Magnetron Sputtering[J]. Journal of Inorganic Materials, 2012, 27(4): 395-399.

Figures/Tables 8

Fig. 1 XRD patterns of Cu2O after sputtened for different time

Fig. 2 Photocatalytic activity of Cu2O film after deposited for different time

Fig. 3 Structural models for Cu2O (110) (a) and (111) (b) surface

Fig. 4 Structural model for Cu2O (110) (a) and (111) (b) surface after O2 adsorption

Table 1 Adsorption parameter of O2 on different crystal planes of Cu2O

	E_abs/(kJ?mol^-1)	d_Cu—O/nm	d_O—O/nm
O₂/Cu₂O(110)	-44.78	0.2383	0.1225
O₂/Cu₂O(111)	-157.45	0.1821	0.1225

Fig. 5 XRD patterns of TiO2 and Cu2O/TiO2 composite film Sputtering Cu2O for 6 s

Fig. 6 SEM images of TiO2 (a) and Cu2O/TiO2 composite films (b)

Fig. 7 Dependence of MB degradation rate on Cu2O content in Cu2O/TiO2 composite film

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Photocatalytic Activity of Cu₂O and Bilayer Cu₂O/TiO₂ Films Prepared by Magnetron Sputtering

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