A simple synthesis and room-temperature magnetic behavior of Co-doped anatase TiO2 nanoparticles

Maensiri, Santi; Laokul, Paveena; Klinkaewnarong, Jutharatana

doi:10.1016/j.jmmm.2005.10.005

Cited by 45 publications

(26 citation statements)

References 35 publications

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“…3a. It can be seen that there is a very weak hysteresis present, which has been observed in other nanoparticle studies of magnetism [14,15,18,28]. For Zn 0.99 Fe 0.01 O, there does appear to be an increase in saturation magnetization M s as the particle size decreases, suggesting that the surface to mass ratio and thus the surface itself plays an important role in the magnetic behavior of these particles (See Fig.…”

Section: Resultssupporting

confidence: 62%

Magnetism of ZnO nanoparticles: Dependence on crystallite size and surfactant coating

Thurber

Beausoleil

Alanko

et al. 2011

Journal of Applied Physics

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Many recent reports on magnetism in otherwise nonmagnetic oxides have demonstrated that nanoparticle size, surfactant coating, or doping with magnetic ions produces room-temperature ferromagnetism. Specifically, ZnO has been argued to be a room-temperature ferromagnet through all three of these methods in various experimental studies. For this reason, we have prepared a series of 1% Fe doped ZnO nanoparticle samples using a single forced hydrolysis co-precipitation synthesis method from the same precursors, while varying size (6 -15 nm) and surface coating concentration to study the combined effects of these two parameters. Size was controlled by modifying the water concentration. Surfactant coating was adjusted by varying the concentration of poly acrylic acid (PAA) in solution. Samples were characterized by x-ray diffraction, transmission electron microscopy, x-ray photoelectron spectroscopy, optical absorptance spectroscopy, and magnetometry. No clear systematic effect on magnetization was observed as a function of surfactant coating, while evidence for a direct dependence of magnetization on the crystallite size is apparent.

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Section: Resultssupporting

confidence: 62%

Magnetism of ZnO nanoparticles: Dependence on crystallite size and surfactant coating

Thurber

Beausoleil

Alanko

et al. 2011

Journal of Applied Physics

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“…Appearance of Ti-O-Ti frequency absorption is noted between 600 and 400 cm -1 (Choudhury and Choudhury 2012). The appearance of band at 2,860 cm -1 was due to the C-H bond of the organic compounds (Maensiri et al 2006). The weak band at 2,833 cm -1 could be ascribed to the characteristic frequencies of residual organic species, which was not completely removed by ethanol and distilled water washing (Guo et al 2007;Wang et al 2007).…”

Section: Resultsmentioning

confidence: 93%

Synthesis and characterization of undoped and cobalt-doped TiO2 nanoparticles via sol–gel technique

et al. 2014

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TiO 2 nanoparticles doped with different concentrations of cobalt (4, 8, 12 and 16 %) were synthesized by sol-gel method at room temperature with appropriate reactants. In general, TiO 2 can exist in anatase, rutile, and brookite phases. In this present study, we used titanium tetra iso propoxide and 2-propanol as a common starting materials and the obtained products were calcined at 500°C and 800°C to get anatase and rutile phases, respectively. The crystalline sizes of the doped and undoped TiO 2 nanoparticles were observed with X-ray diffraction (XRD) analysis. The functional groups of the samples were identified by Fourier transform infrared spectroscopy (FTIR). From UV-VIS diffuse reflectance spectra (DRS), the band gap energy and excitation wavelength of doped and undoped TiO 2 nanoparticles were identified. The defect oriented emissions were seen from photoluminescence (PL) study. The spherical uniform size distribution of particles and elements present in the samples was determined using two different techniques viz., scanning electron microscopy (SEM) with energy-dispersive spectrometer (EDX) and transmission electron microscope (TEM) with selected area electron diffraction (SAED) pattern. The second harmonic generation (SHG) efficiency was also found and the obtained result was compared with potassium di hydrogen phosphate (KDP).

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“…Most of the present research is concentrated on the use of thin films [4][5][6][7][8][9][10][11]. Few studies are devoted to powders [12][13][14]. Room temperature ferromagnetism in cobalt-doped TiO 2 (labelled Co-TiO 2 ) thin films [8,9] and nanoparticles [13] has been observed with the possibility of the existence of ferromagnetism in a new ground state [8], namely the dielectric state.…”

Section: Introductionmentioning

confidence: 99%

“…Few studies are devoted to powders [12][13][14]. Room temperature ferromagnetism in cobalt-doped TiO 2 (labelled Co-TiO 2 ) thin films [8,9] and nanoparticles [13] has been observed with the possibility of the existence of ferromagnetism in a new ground state [8], namely the dielectric state. In general, the observed magnetism was attributed to an intrinsic feature of doped TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…To the best of our knowledge, only few studies have been devoted to rutile Fe-TiO 2 especially in the powder form. Usually, the preparation of such material is carried out at relatively high temperature [12,13]. In this paper a new and simple method was used to prepare room temperature ferromagnetic nanorods Fe-TiO 2 rutile at low temperature (100 • C).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Room temperature ferromagnetism of iron-doped rutile TiO2 nanorods synthesized by a low temperature method

Melghit

Bouziane

2008

Journal of Alloys and Compounds

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A simple synthesis and room-temperature magnetic behavior of Co-doped anatase TiO2 nanoparticles

Cited by 45 publications

References 35 publications

Magnetism of ZnO nanoparticles: Dependence on crystallite size and surfactant coating

Magnetism of ZnO nanoparticles: Dependence on crystallite size and surfactant coating

Synthesis and characterization of undoped and cobalt-doped TiO2 nanoparticles via sol–gel technique

Room temperature ferromagnetism of iron-doped rutile TiO2 nanorods synthesized by a low temperature method

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