期刊
NANO LETTERS
卷 14, 期 11, 页码 6731-6736出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl503585m
关键词
Schottky junction; gold nanoparticle; photocatalysis; visible light; hydrogen production
类别
资金
- National Natural Science Foundation of China [21301138]
- Fundamental Research Funds for the Central Universities [XJJ2013033]
- Xi'an Jiaotong University
- China Postdoctoral Science Foundation [2014M552424]
- U.S. Department of Energy [DE-FG02-09ER16096]
Plasmonic noble metal nanoparticles have emerged as a promising material in sensitizing wide-bandgap semiconductors for visible-light photocatalysis. Conventional methods in constructing such heterocatalysts suffer from either poor control over the size of the metal nanoparticles or inefficient charge transfer through the metal/semiconductor interface, which limit their photocatalytic activity. To solve this problem, in this work we construct Au/TiO2 photocatalysts by depositing presynthesized colloidal Au nanoparticles with well-controlled sizes to TiO2 nanocrystals and then removing capping ligands on the Au surface through a delicately designed ligand-exchange method, which leads to close Au/TiO2 Schottky contact after a mild annealing process. Benefiting from this unique synthesis strategy, the obtained photocatalysts show superior activity to conventionally prepared photocatalysts in dye decomposition and water-reduction hydrogen production under visible-light illumination. This study not only opens up new opportunities in designing photoactive materials with high stability and enhanced performance for solar energy conversion but also provides a potential solution for the well-recognized challenge in cleaning capping ligands from the surface of colloidal catalyst nanoparticles.
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