Synthesis and Characterization of Niobium-doped TiO₂ Nanotube Arrays by Anodization of Ti-20Nb Alloys

Zhengchao Xu 1),Qi Li 1),Shian Gao 1) and Jianku Shang 1,2) 1) Materials Center for Water Purification,Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China 2) Department of Materials Science and Engineering,University of Illinois at Urbana-Champaign,Urbana,IL 61801,USA

摘 要：Well crystallized niobium-doped TiO₂ nanotube arrays（TiNbO-NT） were successfully synthesized via the anodization of titanium/niobium alloy sheets,followed with a heat treatment at 550 C for 2 h.Morphology analysis results demonstrated that both the titanium/niobium alloy microstructure and the dissolution strength of electrolyte played major roles in the formation of nanotube structure.A single-phase microstructure was more favorable to the formation of uniform nanotube arrays,while modulating the dissolution strength of electrolyte was required to obtain nanotube arrays from the alloys with multi-phase microstructures.X-ray diffraction（XRD） and X-ray photoelectron（XPS） analysis results clearly demonstrated that niobium dopants（Nb 5+） were successfully doped into TiO₂ anatase lattice by substituting Ti 4+ in this approach.

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