[1] Fujishima A, Honda K 1972 Nature 238 37
[2] Asahi R, Morikawa T, Ohwaki T, Aoki K, Taga Y 2001 Science 293 269
[3] Hoffmann M R, Matrin S T, Wonyong C, Bahnemann D W 1995 Chem. Rev. 95 69
[4] Jing L Q, Sun X J, Shang J 2003 Sol. Ener. Mater. Sol. Cells 79 133
[5] Byme J A, Eggins B R, Brown N M D 1998 Appl. Catal. B 17 25
[6] Tang H, Lévy F, Berger H, Schmid P E 1995 Phys. Rev. B 52 7771
[7] Zhao D, Huang X, Tian B, Zhou S, Li Y, Du Z 2011 Appl. Phys. Lett. 98 162107
[8] Jia L, Wu C, Li Y, Han S, Li Z, Chi B, Pu J, Jian L 2011 Appl. Phys. Lett. 98 211903
[9] Tan K, Zhang H, Xie C, Zheng H, Gu Y, Zhang W F 2010 Catal. Commun. 11 331
[10] Li N, Yao K L, Li L, Sun Z Y, Gao G Y, Zhu L 2011 J. Appl. Phys. 110 073513
[11] Su Y, Xiao Y, Li Y, Du Y, Zhang Y 2011 Mater. Chem. Phys. 126 761
[12] Nakhate G G, Nikam V S, Kanade K G, Arbuj S, Kale B B, Baeg J O 2010 Mater. Chem. Phys. 124 976
[13] Lin Y M, Jiang Z Y, Hu X Y, Zhang X D, Fan J, Miao H, Shang Y B 2012 Chin. Phys. B 21 033103
[14] Long R, English N J 2012 New J. Phys. 14 053007
[15] Xu J J, Ao Y H, Fu D, Yuan C W 2008 J. Colloid Interf. Sci. 328 447
[16] Kresse G, Hafner J 1994 J. Phys. Rev. B 47 558
[17] Kresse G, Furthmller J 1996 J. Phys. Rev. B 54 11169
[18] Monkhorst H J, Pack J D 1976 Phys. Rev. B 13 5188
[19] Vanderbilt D 1990 Phys. Rev. B 41 7892
[20] Yang K, Dai Y, Huang B 2008 Chem. Phys. Lett. 456 71