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Investigation of the physical properties of Fe:TiO2-diluted magnetic semiconductor nanoparticles

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Abstract

The structural, optical, magnetic, and electrical properties of sol–gel-derived Ti1−xFexO2 (0.00 ≤ x ≤ 0.05) nanoparticles were investigated. Rietveld refinement of the X-ray diffraction data and TEM measurements were carried out to analyze the crystalline structure and quality of all the samples. Raman spectroscopy revealed a decrease in intensity and broadening of the characteristics peaks of Fe-doped TiO2 with respect to those of the pristine sample, which signifies a structural distortion of the lattices. FT-IR, UV-vis, and PL spectroscopy were used to investigate the optical properties. Magnetic measurements showed a weak ferromagnetism at room temperature in both the pristine and Fe-doped TiO2 (x = 0, 0.02, and 0.05) nanoparticles. Temperature-dependent resistivity measurements showed the semiconducting nature of the samples and revealed that the thermally activated conduction (Arrhenius) mechanism is valid in the high-temperature region, whereas Mott variable range hopping (VRH) mechanism is valid in the low-temperature region. Dielectric properties of the samples were studied as a function of temperature in the frequency range of 1 kHz to 1 MHz.

Graphical abstract: Investigation of the physical properties of Fe:TiO2-diluted magnetic semiconductor nanoparticles

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Publication details

The article was received on 15 Jan 2017, accepted on 30 Mar 2017 and first published on 30 Mar 2017


Article type: Paper
DOI: 10.1039/C7TC00233E
Citation: J. Mater. Chem. C, 2017, Advance Article
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    Investigation of the physical properties of Fe:TiO2-diluted magnetic semiconductor nanoparticles

    B. Prajapati, S. Kumar, M. Kumar, S. Chatterjee and A. K. Ghosh, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC00233E

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