Influence of transition metal doping on the structural, optical, and magnetic properties of TiO2 films deposited on Si substrates by a sol-gel process.
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It is found that the magnetizations of the TM-doped TiO2 films decrease with increasing dopant content, which is related to electric disorder due to the ART.Abstract:
Transition metal (TM)-doped TiO2 films (TM = Co, Ni, and Fe) were deposited on Si(100) substrates by a sol–gel method. With the same dopant content, Co dopants catalyze the anatase-to-rutile transformation (ART) more obviously than Ni and Fe doping. This is attributed to the different strain energy induced by the different dopants. The optical properties of TM-doped TiO2 films were studied with spectroscopic ellipsometry data. With increasing dopant content, the optical band gap (EOBG) shifts to lower energy. With the same dopant content, the EOBG of Co-doped TiO2 film is the smallest and that of Fe-doped TiO2 film is the largest. The results are related to electric disorder due to the ART. Ferromagnetic behaviors were clearly observed for TM-doped TiO2 films except the undoped TiO2 film which is weakly magnetic. Additionally, it is found that the magnetizations of the TM-doped TiO2 films decrease with increasing dopant content.read more
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References
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Ferromagnetism in ZnO Nanoparticles Induced by Doping of a Nonmagnetic Element: Al
Daqiang Gao,Jing Zhang,Guijin Yang,Jinlin Zhang,Zhenhua Shi,Jing Qi,Zhaohui Zhang,Desheng Xue +7 more
TL;DR: The room-temperature ferromagnetism of Zn1−xAlxO nanoparticles synthesized by a sol−gel method is reported in this paper, where X-ray diffraction and selected area electron diffraction results show that the Al atoms have successfully substituted for some of the Zn atoms in the lattice without forming other new phases.
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Effect of cobalt doping on the phase transformation of TiO2 nanoparticles.
TL;DR: Results obtained revealed that the rutile to anatase concentration ratio increases with increase of the cobalt dopant concentration and annealing temperature.
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