標題: Facet-Dependent Photocatalytic Behaviors of ZnS-Decorated Cu2O Polyhedra Arising from Tunable Interfacial Band Alignment
作者: Naresh, Gollapally
Hsieh, Pei-Lun
Meena, Vandana
Lee, Shih-Kuang
Chiu, Yi-Hsuan
Madasu, Mahesh
Lee, An-Ting
Tsai, Hsin-Yi
Lai, Ting-Hsuan
Hsu, Yung-Jung
Lo, Yu-Chieh
Huang, Michael H.
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: band alignment;cuprous oxide;facet-dependent properties;heterojunctions;interfacial charge transfer;zinc sulfide
公開日期: 23-一月-2019
摘要: ZnS particles were grown over Cu2O cubes, octahedra, and rhombic dodecahedra for examination of their facet-dependent photocatalytic behaviors. After ZnS growth, Cu2O cubes stay photocatalytically inactive. ZnS-decorated Cu2O octahedra show enhanced photocatalytic activity, resulting from better charge carrier separation upon photo excitation. Surprisingly, Cu2O rhombic dodecahedra give greatly suppressed photocatalytic activity after ZnS deposition. Electron paramagnetic resonance spectra agree with these experimental observations. Time-resolved photoluminescence profiles provide charge-transfer insights. The decrease in the photocatalytic activity is attributed to an unfavorable band alignment caused by significant band bending within the Cu2O(110)/ZnS(200) plane interface. A modified Cu2O-ZnS band diagram is presented. Density functional theory calculations generating plane -specific band energy diagrams of Cu2O and ZnS match well with the experimental results, showing that charge transfer across the Cu2O(110)/ZnS(200) plane interface would not happen. This example further illustrates that the actual photocatalysis outcome for semiconductor heterojunctions cannot be assumed because interfacial charge transfer is strongly facet-dependent.
URI: http://dx.doi.org/10.1021/acsami.8b19197
http://hdl.handle.net/11536/148785
ISSN: 1944-8244
DOI: 10.1021/acsami.8b19197
期刊: ACS APPLIED MATERIALS & INTERFACES
Volume: 11
起始頁: 3582
結束頁: 3589
顯示於類別:期刊論文