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Highly ordered lanthanum-doped (La-doped) TiO 2 nanotube arrays were prepared by electrochemical anodization process on a Ti sheet, followed by cathodic electrochemical process using lanthanum nitrate solution as the La source, and at last were analyzed by SEM, XPS, FTIR, XRD, and DRS characterization techniques. The analytical results demonstrated that the La doping could promoted phase transformation...
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