Dopant induced changes in structural and optical properties of Cr3+ doped TiO2 nanoparticles

作者：Choudhury Biswajit; Choudhury Amarjyoti^*

来源：Materials Chemistry and Physics, 2012, 132(2-3): 1112-1118.

DOI：10.1016/j.matchemphys.2011.12.083

• Nanostructures
• Color centers
• Crystal fields
• Defects
• Luminescence

Chromium doped TiO2 nanoparticles were synthesized by sol-gel method and studied by X-ray diffraction, Raman, UV-vis and photoluminescence spectroscopy. The size distribution and composition of the material were investigated by TEM and EDAX respectively. Incorporation of Cr3+ leads to the distortion of lattice structure and creation of oxygen vacancies as revealed by XRD and Raman spectra. Crystal field splitting of Cr3+ in substituted TiO2 results in a spin allowed and spin forbidden absorption peaks arising from Fano antiresonance. Luminescence spectra give emission lines of dopant as well as of oxygen related defect centers.

• 出版日期2012-2-15