Fabrication of AgAu alloy-TiO₂ core-shell nanoparticles and their photocatalytic properties

Abstract

In this paper, for improving the photocatalytic efficiency of titania (TiO₂) nanoparticles (NPs), AgAu alloy-TiO₂ core-shell NPs are fabricated via a sol-gel (SG) process in the presence of AgAu alloy NPs with block copolymer shells as templates. The photocatalytic activities of the AgAu-TiO₂ NPs on the photodecomposition of methylene blue (MB) are investigated. The AgAu-TiO₂ composite NPs coated with 5.0% titania related to block copolymers show higher photocatalytic activity than the other samples in which the titania contents are larger than 5.0%. The results indicate that the increase of the thickness of the TiO₂ shell leads to the decrease of the photocatalytic activity.

Keywords

Methylene Blue / Block Copolymer / Methylene Blue / High Photocatalytic Activity / Galvanic Replacement Reaction

References

[1] Seery M K, George R, Floris P, Pillai S C. Journal of Photochemistry Photobiology A: Chemistry. 2007, 189: 258

[2] Grabowska E, Zaleska A, Sorgues S, Kunst M, Etcheberry A, Justin C C, Remita H. Journal of Physical Chemistry C. 2013, 117: 1955

[3] Huang R, Zhu A, Gong Y, Zhang Q, Liu Q. Industrial & Engineering Chemistry Research. 2013, 52: 7432

[4] Wodka D, Bielańska E, Socha R P, Wodka M E, Gurgul J, Nowak P, Warszyński P, Kumakir I. Applied Materials Interfaces. 2010, 7: 1945

[5] Gao H-s, Wang Z-z, Xie Y-y, Geng Z-x, Kan Q, Wang C-x, Yuan J, Chen H-d. Journal of Optoelectronics ·Laser. 2014, 25: 1338

[6] Qi J-x. Journal of Optoelectronics·Laser. 2014, 25: 282

[7] Su C, Liu L, Zhang M, Zhang Y, Shao C. Cryst. Eng. Comm.. 2012, 14: 3989

[8] Wu X-F, Song H-Y, Yoon J-M, Yu Y-T, Chen Y-F. Langmuir. 2009, 25: 6438

[9] Liu H, Sun K, Zhao J, Guo R, Shen M, Cao X-Y, Zhang G-X, Shi X-Y. Colloids and Surfaces A. 2012, 405: 22

[10] Guo S J, Dong S J, Wang E. Journal of Physical Chemistry C. 2009, 113: 5485

[11] Qu J L, Liu H, Ye F, Hu W W, Yang J. International Journal of Hydrogen Energy. 2012, 37: 13191

[12] Liu X, Wang A, Yang X, Zhang T, Mou C-Y, Su D-S, Li J. Chemistry of Materials. 2009, 21: 410

[13] Raveendran P, Fu J, Wallen S L. Green Chemistry. 2006, 8: 34

[14] Yuan S, Li X, Zhang X, Jia Y. Fabrication of Au-Ag Bimetallic Nanostructures through the Galvanic Replacement Reaction of Block Copolymer-Stabilized Ag Nanoparticles with HAuCl₄. Sci. Adv. Mater.. 2014

[15] Wang C, Ying J Y. Chemistry of Materials. 1999, 11: 3113

[16] Horiguchi Y, Kanda T, Torigoe K, Sakai H, Abe M. Langmuir. 2014, 30: 922

[17] Yang Y, Wen J, Wei J, Xiong R, Shi J, Pan C. Applied Materials Interfaces. 2013, 5: 6201