Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 13, Issue 10, Pages 6835-6840Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2013.7787
Keywords
Silicon Nanowire Array; Titanium Dioxide; Core/Shell Structure; Photoactivity
Categories
Funding
- National Natural Science Funds of China [11104283]
- National Basic Research Program of China [2010CB934103]
- Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics [KF201207]
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Large-area Si/TiO2 core/shell nanowire arrays were prepared for the first time by solution approach, followed by annealing in Ar (SiNWs/TiO2-Ar) and air (SiNWs/TiO2-air) atmosphere, respectively. Au nanoparticles were decorated onto the SiNWs/TiO2-Ar samples (SiNWs/TiO2 @ AuNPs-Ar) to further improve the photoactivity. XRD results showed that the TiO2 shells have an anatase crystalline structure. Photocurrent of solar water splitting was measured by a three electrode setup, in which the Si/TiO2 core/shell nanowire array served as the working electrode. It was found for the first time that Ar ambience annealing is more helpful improving the photocurrent density. The SiNWs/TiO2-Ar sample enhanced the photocurrent by 6.3 times compared to the SiNWs/TiO2-air sample. Furthermore, the SiNWs/TiO2@AuNPs-Ar arrays exhibited a photocurrent of 0.9 mA/cm(2), 3.6 times as high as that of its counterpart without Au nanoparticles.
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