An Approach of Heteroepitaxy to Understand Charge Dynamics Across Au -BiVO4 Interface
N. V. Chien, K. A. Tasi, H. H. Kuo, Dr. H. J. Liu, Y. J. Hsu, Y. H. Chu1, W. S. Chang4, J. W. Chen, C.L. Wu, Y. C. Chen2, . Y. Tzeng, Y.C. Lin, W. C. Chou, C. W. Luo3, Nguyen Van Chien1*
1Materials Science and Engineering, National Chiao Tung University, HsinChu, Taiwan
2Department of Physics, National Cheng Kung University, Tainan, Taiwan
3Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan
4School of Engineering, Monash University Malaysia, Selangor, Malaysia
* presenting author:nguyen van chien,
The enhanced photoactivity of plasmonic semiconductor photocatalysts with particular crystal facet has shed light on the design of highly efficient photocatalyst platform. Herein, we utilized Au-decorated BiVO4 (BVO), in which BVO thin film with exposed {001} facets was decorated with Au nanoparticles (NPs) with various sizes and densities, as a model photocatalyst for realizing the plasmonic photocatalysis. The Au/BVO heterostructures exhibited significantly enhanced photoactivities in both dye degradation and electrolytic water splitting. The results of 3D finite-difference time domain (FDTD) simulation showed strong electrical field amplification for Au/BVO in the visible region, ascribable to the SPR excitation of the decorated Au. The energy band alignment and electron relaxation dynamics of Au/BVO heterostructures suggested that the improved interfacial electron transfer from BVO to Au was responsible for the enhanced photoactivity of Au/BVO. This study delivers a general approach to probe the photochemistry of noble metal - complex oxide heterostructures for photoconversion applications.

Keywords: Au/ BiVO4 heterostructure, plasmonic photocatalysis