NDLI: Dopant concentration dependent magnetism of Cu-doped TiO$

Content Provider	Springer Nature Link
Author	Anitha, B. Khadar, M. Abdul
Copyright Year	2016
Abstract	Undoped and Cu-doped nanocrystals of TiO$_{2}$ having the size range of 8–11 nm were synthesized by peroxide gel method. XRD analysis using Rietveld refinement confirmed anatase phase with a small percentage of rutile content for undoped TiO$_{2}$ nanocrystals while a pure anatase phase with preferential growth along [004] direction was observed for nanocrystals of Cu-doped TiO$_{2}$. Variation in the intensity ratios of the XRD peaks of the doped samples compared to that of the undoped sample offered an evidence for the substitutional incorporation of Cu ions in the TiO$_{2}$ lattice. The preferential growth of the nanocrystals along the [004] direction was verified using HRTEM analysis. Cu doping extended the optical absorption edge of TiO$_{2}$ nanocrystals to the visible spectral region and caused a blue shift and broadening of the E $_{g}$ (1) Raman active mode of anatase TiO$_{2}$. Undoped TiO$_{2}$ sample showed a weak ferromagnetism superimposed on a diamagnetic background while Cu-doped TiO$_{2}$ samples exhibited a weak ferromagnetism in the low-field region with a paramagnetic component in the high-field region. The magnetic moment exhibited by the doped samples is interpreted as the resultant of a weak ferromagnetic moment in the low-field region arising from the presence of defects near the surface of TiO$_{2}$ nanoparticles or from the interaction of the substituted Cu ions with the oxygen vacancies, and the paramagnetic contribution from the increased Cu dopant concentration near the surface of the particles arising from self-purification mechanism.
Starting Page	1
Ending Page	14
Page Count	14
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	18
Issue Number	6
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-06-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	TiO$_{2}$ nanocrystals Cu dopant Magnetic properties Self-purification mechanism Semiconductor materials Nanotechnology Inorganic Chemistry Characterization and Evaluation of Materials Physical Chemistry Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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