Microstructures and optical properties of TiO2/ZrO2 nanotube/nanoporous heterofilm prepared by anodizing of Ti/Zr/Ti multilayer films
Source abstract
Abstract
Abstract This paper reports a novel method for preparing TiO2/ZrO2 nanotube/nanoporous (TiO2 NTs/ZrO2 NPs) heterofilm by directly anodizing Ti/Zr/Ti multilayer films deposited on silicon substrates. The as-deposited multilayer and anodized films were characterized by scanning electron microscope, energy dispersive spectroscopy and X-ray diffraction to further investigate the microstructures. The whole upper Ti and partial lower Ti layers were transformed into highly ordered TiO2 nanotubes under an optimized anodizing condition, in contrast the middle Zr layer was transformed into ZrO2 with nanoporous structure. Photo-absorption performance of the P25, TiO2 nanotubes (TiO2 NTs) array and TiO2 NTs/ZrO2 NPs heterofilm were investigated by ultraviolet-visible diffuse reflection spectra. The TiO2 NTs/ZrO2 NPs heterofilm has strong absorption in the ultraviolet region and extends the absorption range to the visible light. Compared with TiO2 NTs, the TiO2 NTs/ZrO2 NPs heterofilm exhibited stronger absorbance in the range of 300-475 nm due to the synergistic effect produced by the nanoscale interaction of two metal oxide semiconductors with different structures. The energy band gap values are 2.98 and 3.01 eV for TiO2 NTs and TiO2 NTs/ZrO2 NPs heterofilm, respectively. These results are of great significance in the preparation of metal oxide with designable heterostructure on desired substrates.
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Research context
OpenAlex topics: TiO2 Photocatalysis and Solar Cells · Anodic Oxide Films and Nanostructures · Advanced Photocatalysis Techniques
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