Abstract
5 mm long aligned titanium oxide/carbon nanotube (TiO2/CNT) coaxial nanowire arrays have been prepared by electrochemically coatingthe constituent CNTs with a uniform layer of highly crystalline anataseTiO2 nanoparticles. Whilethe presence of the TiO2 coating was confirmed by scanning electron microscopy, transmissionelectron microscopy, Raman spectroscopy and x-ray diffraction, the resultantTiO2/CNT coaxial arrays were demonstrated to exhibit minimized recombination ofphotoinduced electron–hole pairs and fast electron transfer from the longTiO2/CNT arraysto external circuits. This, in conjunction with the aligned macrostructure, facilitates the fabrication ofTiO2/CNT arrays forvarious device applications, ranging from photodetectors to photocatalytic systems. Thus, the millimeterlong TiO2/CNT arrays represent a significant advance in the development of new macroscopicphotoelectronic nanomaterials attractive for a variety of device applications beyond thosedemonstrated in this study.
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