Synthesis and structural characterization of Co2+ ions doped ZnO nanopowders by solid state reaction through sonication

Babu, B. Hari; Krishna, Ch. Rama; Reddy, Ch. Venkata; Manjari, V. Pushpa; Ravikumar, R.V.S.S.N.

doi:10.1016/j.saa.2013.02.032

Cited by 30 publications

(9 citation statements)

References 39 publications

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“…4 A 2g (F): m 2 and 4 T 1g (F) ? 4 T 2g (F): m 1 are almost invariable from 1.9 to 2.2 [25,26]. In the present study, ratio of m 2 to m 1 is around 2.13.…”

Section: Optical Absorption Studysupporting

confidence: 55%

Structural and photoluminescence studies of Co2+ doped Ca–Li hydroxyapatite nanopowders

Koutavarapu

Babu

Rao

et al. 2015

J Mater Sci: Mater Electron

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Co 2? doped Calcium-Lithium Hydroxyapatite (CLHA) nanopowders were prepared by mechanochemical synthesis and characterized by different techniques. From Powder XRD data, the crystal system belongs to hexagonal structure and lattice cell parameters, average crystallite size were evaluated. The morphologies of prepared samples were analyzed by using SEM and TEM studies. Optical and EPR data confirms that the doped Co 2? enter into host material as distorted octahedral site symmetry. PL studies of Co 2? doped CLHA nanopowders exhibit UV, blue and yellow emission bands. CIE chromaticity coordinates were also calculated from emission spectra of Co 2? doped CLHA nanopowders. Vibrational bands related to phosphate molecules, P-O-H and hydroxyl ions are observed in FT-IR spectra.

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“…4 A 2g (F): m 2 and 4 T 1g (F) ? 4 T 2g (F): m 1 are almost invariable from 1.9 to 2.2 [25,26]. In the present study, ratio of m 2 to m 1 is around 2.13.…”

Section: Optical Absorption Studysupporting

confidence: 55%

Structural and photoluminescence studies of Co2+ doped Ca–Li hydroxyapatite nanopowders

Koutavarapu

Babu

Rao

et al. 2015

J Mater Sci: Mater Electron

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“…In D(λ) spectra of the powders in the initial state there are the weak absorption bands at λ=7.3 μm, 6.2 μm, and 3.1 μm which correspond to the vibrations of b-CO 3 , water, and O-H strongly adsorbed on the nanoparticles surface [5]. Doping with Co does not influence the spectra at λ>4 μm and results in the increase of the absorption at λ<4 μm that is caused by the appearance of the absorption bands attributed to the d-d-transitions in Co-ions [6].…”

Section: Resultsmentioning

confidence: 96%

Appearance of itinerant electrons detected by IR spectroscopy and its correlation with surface magnetism in Co-doped TiO2 nanopowders

et al. 2018

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Abstract. IR absorption and magnetic data for the titanium dioxide nanopowders are studied. Additional absorption in IR range is revealed in nanocrystalline TiO 2 and Co-doped TiO 2 after reducing annealing and explained by appearance of the oxygen vacancies and delocalised charge carriers. Increasing of the absorption in IR range after annealing of Co-doped TiO 2 in vacuum (or decreasing of this contribution after annealing in air) correlates with arising (or vanishing) of ferromagnetic contribution.

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“…The bands observed at around 387, 467 and 555 nm depend on crystal field parameter Dq and are assigned to the transitions 6 A 1g (S) ? 4 T 2g (D), 6 A 1g (S) ? 4 T 2g (G) and 6 A 1g (S) ?…”

Section: Optical Absorptionmentioning

confidence: 99%

“…4 T 2g (D), 6 A 1g (S) ? 4 T 2g (G) and 6 A 1g (S) ? 4 T 1g (G) respectively; the band observed at around 420 nm is assigned to the transition 6 A 1g (S) ?…”

Section: Optical Absorptionmentioning

confidence: 99%

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A simple sonochemical approach of Mn2+ doped ZnO nanopowder: structural, optical and magnetic studies

Babu

Nagajyothi

Shin

et al. 2015

J Mater Sci: Mater Electron

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Mn 2? doped ZnO nanopowder was prepared by simple sonochemical method. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, optical absorption (UV-Vis), photoluminescence (PL), Electron Paramagnetic Resonance (EPR), Fourier transform infrared (FT-IR) spectroscopy and magnetization have been used to characterize the sample. XRD study revealed that Mn 2? doped ZnO had wurtzite hexagonal structure. Composition analysis by EDX indicated the presence of small amounts of manganese. Crystal field (Dq) and interelectronic repulsion (B, C) parameters are evaluated from optical absorption. SpinHamiltonian and bonding parameters are evaluated from the EPR study. Optical and EPR confirms that the Mn 2? entered into ZnO lattice as distorted octahedral site symmetry. FT-IR spectrum exhibited vibrational bands of Zn-O bonds. PL spectrum shows the emission bands in UV and visible region. Magnetization loop was measured and clearly shows typical ferromagnetic saturation behavior. The results suggest oxygen vacancies, especially singly ionized oxygen vacancies, play a crucial role in mediating ferromagnetism in the Mn doped ZnO system.

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Synthesis and structural characterization of Co2+ ions doped ZnO nanopowders by solid state reaction through sonication

Cited by 30 publications

References 39 publications

Structural and photoluminescence studies of Co2+ doped Ca–Li hydroxyapatite nanopowders

Structural and photoluminescence studies of Co2+ doped Ca–Li hydroxyapatite nanopowders

Appearance of itinerant electrons detected by IR spectroscopy and its correlation with surface magnetism in Co-doped TiO2 nanopowders

A simple sonochemical approach of Mn2+ doped ZnO nanopowder: structural, optical and magnetic studies

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