期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 12, 页码 5629-5640出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm15477c
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资金
- Royal Society of New Zealand [04-UoA-196]
- JENESYS program
Heterostructure ZnO/TiO2 core-brush nanostructures were synthesized on glass substrates by a combination of aqueous solution growth and magnetron sputtering method. The microstructure and morphology were characterized using scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The heterostructure core-brush shows the single crystal ZnO nanorod as the core and polycrystalline TiO2 nanowires as the brush-like outer layer. Surface electronic states and optical transmittance were measured using X-ray photoelectron spectroscopy and a UV-vis spectrometer. The growth mechanism was proposed as a slow particle-by-particle mechanism. The photocatalytic activity of the ZnO/TiO2 core-brush nanostructure was evaluated by the decomposition reaction of Bromo-Pyrogallol Red dye under UV (245 nm) and visible-light (450 nm) irradiation. The results revealed that the core-brush structure exhibited much higher photocatalytic activities than that of a TiO2 film and a TiO2/ZnO composite film. The photocatalytic activity enhancement of the ZnO/TiO2 core-brush could be attributed to the interaction effect, lower band gap energy and its unique core-brush feature which can lower the recombination rate of electron-hole pairs, extend the absorption range and provide a high density of active sites.
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