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Mixed phases Co2+-doped TiO2 nanoparticles have been prepared by a novel method combined with sol–gel and hydrothermal methods. The section of sol–gel method, sol, provides an unstable colloidal reaction system for the next reaction process. The hydrothermal method is to treat the above reaction system to prepare undoped and doped samples. The as-prepared samples have been characterized by XRD, SEM,...
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