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Structural, optical, and magnetic properties of Cu‐doped TiO 2 samples
Author(s) -
Ahmed S. A.
Publication year - 2017
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201600335
Subject(s) - photoluminescence , ferromagnetism , materials science , antiferromagnetism , doping , analytical chemistry (journal) , spectroscopy , band gap , microstructure , annealing (glass) , oxygen , magnetic moment , magnetic semiconductor , condensed matter physics , chemistry , metallurgy , optoelectronics , physics , organic chemistry , chromatography , quantum mechanics
We report here the microstructure, optical, and magnetic properties of Cu‐doped TiO 2 (Ti 1−x Cu x O 2 ) nanopowder samples with x = 0.02, 0.04, and 0.06 prepared by a solid‐state reaction method. XRD studies indicated the incorporation of Cu into the TiO 2 lattice. Ultraviolet‐visible spectroscopy (UV–vis) measurements revealed that the band gap decreased due to the incorporation of Cu. Photoluminescence (PL) results showed an enhanced photoluminescence property associated with oxygen vacancies from TiO 2 due to the incorporation of Cu. Magnetic investigations demonstrated that all of the samples had room temperature ferromagnetism (RTFM). RTFM was observed in the Ti 0.98 Cu 0.02 O 2 samples annealed at 500°C and reduced RTFM was clearly observed in the samples annealed at high temperatures of 600 and 700°C. Furthermore, the saturation magnetic moment decreased with increasing Cu content for the samples annealed at 500ᴼC with different doping Cu contents, due to the increased Cu atoms occupying neighbouring cation lattice sites, which resulted in an antiferromagnetic configuration. The results demonstrated that defects and/or oxygen vacancies, and the distances between nearest‐neighbour Cu atoms, have a significant influence on ferromagnetism in Cu‐doped TiO 2 powder samples.