期刊
CHEMICAL VAPOR DEPOSITION
卷 19, 期 4-6, 页码 149-155出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cvde.201207037
关键词
ALD; Electrospinning; Nanofibers; Photocatalysis; WO3
资金
- Marie Curie Intra-European Fellowship [PIEF-GA-2009-235655]
- Hungarian Academy of Sciences
- Finnish Centre of Excellence in Computational Molecular Science
- University of Helsinki Research Funds (HENAKOTO)
- Academy of Finland
Core WO3 nanofibers (140-300nm in diameter, several hundred mu m long) are made by a novel, water-based electrospinning process using ammonium metatungstate (AMT) and polyvinylpyrrolidone (PVP) as precursors. TiO2 shells (1.5-20nm) are grown by atomic layer deposition (ALD) using TiCl4 and water at 250 degrees C. The WO3/TiO2 composite fibers are analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM)-energy dispersive X-ray (EDX), transmission electron microscopy (TEM), Raman spectroscopy (RS), UV-Vis spectroscopy, and X-ray photoelectron spectroscopy (XPS). The optimal photocatalytic conversion under visible light is reached by the WO3/1.5nm TiO2 nanofibers, which have higher activity compared to bare WO3 and Degussa TiO2. Thicker TiO2 layers fill the pores of the nanowires and reduce the specific surface area, weakening the photocatalytic activity.
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