Morphology Dependent Luminescence Properties of Co Doped TiO2 Nanostructures

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• 作者：Kajari Das ; Shailesh N. Sharma ; Mahesh Kumar ; S. K. De
• 刊名：Journal of Physical Chemistry C
• 出版年：2009
• 出版时间：August 20, 2009
• 年：2009
• 卷：113
• 期：33
• 页码：14783-14792
• 全文大小：463K
• 年卷期：v.113,no.33(August 20, 2009)
• ISSN：1932-7455

文摘

One dimensional (1D) anatase Co doped TiO₂ nanostructures such as nanorods, nanowires, and nanotubes were synthesized by a simple solvothermal method using CoCl₂·6H₂O as the cobalt source. The effect of the different solvents on the crystal structures, morphologies, and sizes of the Co doped 1D nanostructures was investigated. The doping concentration of the samples primarily depends on the solvents. The X-ray photoelectron spectroscopy studies clearly showed that the Co was incorporated into the TiO₂ lattice as Co²⁺ and oxygen vacancies were created due to the substitution of the Ti⁴⁺ ions by Co²⁺ ions. Optical absorption measurements showed additional absorption bands that are due to the ligand field transitions, ⁴T_1g(⁴F) → ⁴T_1g(⁴P) of Co²⁺ and also due to the transitions from different trap states related to the oxygen vacancies. The effects of the doping concentration on the defect structures and oxygen vacancies of the 1D nanostructures were mainly investigated using steady state photoluminescence (PL) and PL decay.