Co-Doped ZnO Nanoparticles: Structural, Morphological, Optical, Magnetic and Antibacterial Studies

Basith, N. Mohamed; Vijaya, J. Judith; Kennedy, L. John; Bououdina, M.; Jenefar, S.; Kaviyarasan, V.

doi:10.1016/j.jmst.2014.07.013

Cited by 81 publications

(32 citation statements)

References 56 publications

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“…In fact, the Co 2+ ions first easily enter into the ZnO sites by increasing the level of impurity to 6%, and then, substitute into the ZnO matrix, which leads to an increase in the interplanar spacing d of (002) and (101). The linear increase in the interplanar spacing d of (002) from x = 0% to x = 6% is in agreement with the studies of previous researchers . The change in the lattice parameters a and c vs doped Co, as shown in Figure C, reveals significant an increase the level of Co impurity x = 0.02, which is in agreement with previous research .…”

Section: Resultssupporting

confidence: 92%

“…The linear increase in the interplanar spacing d of (002) from x = 0% to x = 6% is in agreement with the studies of previous researchers . The change in the lattice parameters a and c vs doped Co, as shown in Figure C, reveals significant an increase the level of Co impurity x = 0.02, which is in agreement with previous research . This indicates that Co ions reside in the ZnO lattice, whereas there is not an obvious change in lattice parameter values for x = 0.04 and 0.06 of Co impurities.…”

Section: Resultssupporting

confidence: 92%

“…According to Vegard's law, higher doping levels could increase the volume of the unit cell . The volume of the unit cell and the bond length increases with an increase in the Co content with a doping of 2%; this is matched with lattice constant variation, which is in agreement with the previous studies . It is observed that changes in the Zn‐O bond length are similar to the variation in the lattice parameters for the level of impurity of 2% because of the incorporation of more electrons in their bonding.…”

Section: Resultssupporting

confidence: 89%

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Structural, optical, thermoelectrical, and magnetic study of Zn_1‐xCo_xO (0 ≤ x ≤ 0.10) nanocrystals

Akhtari

Zorriasatein

Farahmandjou

et al. 2017

Int J Applied Ceramic Tech

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In this work, we have prepared Co‐doped ZnO nanocomposites by zinc nitrate and cobalt sulfate as new precursors via the coprecipitation method and the samples were followed to identify the morphological, optical, structural, and magnetic properties. The XRD patterns revealed the crystalline nature of nanoparticles with hexagonal wurtzite structures, which meant that Co impurity did not disturb the structure of pure ZnO and the minimum crystallite size of nanoparticles was calculated to be around 37 nm. The XRD patterns also showed the lattice parameter increase owing to the incorporation of a Co dopant. The TEM results revealed the sphere‐like particles whose size varied between 56 and 88 nm in diameter at a 4% level of impurity. DRS analysis identified that the band gap energy decreased from 3.18 eV for the pure substance to 2.36 eV for the 10% impure substance. VSM analysis exhibited that the saturation magnetization value increased to 8.4 × 10−3 emu/g for the highest Co content of 10%, which indicated the ferromagnetic behavior of NPs.

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Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 89%

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Structural, optical, thermoelectrical, and magnetic study of Zn_1‐xCo_xO (0 ≤ x ≤ 0.10) nanocrystals

Akhtari

Zorriasatein

Farahmandjou

et al. 2017

Int J Applied Ceramic Tech

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“…An open area outside the central membrane periplasmic region is followed by a thin peptidoglycan layer acting as a permeability barrier reducing the absorption of reactive oxygen species (ROS) into the cell membrane . The appreciable antibacterial activity of as synthesized ZnO NPs in the present work compared to earlier reports can be attributed to their smaller size in consonance with previous reports …”

Section: Resultsmentioning

confidence: 99%

Photocatalytic and Antibacterial Activity Studies of ZnO Nanoparticles Synthesized by Thermal Decomposition of Mechanochemically Processed Oxalate Precursor

2016

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The ZnO nanoparticles (NPs) have been prepared by thermal decomposition of zinc oxalate precursor ZnC2O4.2H2O synthesized by a simple solution‐free mechanochemical method. Thermogravimetric analysis/Differential thermal analysis (TGA/DTA) studies of oxalate precursor showed it to undergo two step decomposition yielding zinc oxide nanoparticles. The ZnO NPs have been thoroughly characterized by Powder X‐ray diffraction (XRD), Fourier Transform Infrared (FTIR), Transmission Electron Microscopy (TEM) and UV‐Visible techniques. XRD pattern showed that nanoparticles present hexagonal wurtzite phase of ZnO with high crystallinity. The Rietveld's refinement of the XRD pattern has shown the average grain size of the as synthesized nanoparticles to be 13 nm. The photocatalytic activity of as prepared ZnO NPs studied using Methyl Orange (MO) as probe molecule have effected ∼90 % degradation of 0.045 mM of MO in 100 min at catalyst load of 1.5 g L−1. As prepared ZnO NPs photocatalyst are appreciably stable and reusable. The antibacterial activity study of ZnO NPs assayed against Gram positive bacteria Staphylococcus aureus and Staphylococcus epidermidis and Gram negative bacteria Pseudomonas aeruginosaandEnterobacter aerogenes by MIC method has shown that as prepared ZnO NPs constitute effective antibacterial agents.

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“…Among all of the transition metals, Co has been frequently employed because of its variable oxidation state, large magnetic and high solubility limit in ZnO. In the past several years, many studies in Co-doped ZnO are focused on its magnetic properties [6][7], however, the properties of variable emissivity are neglected. Nevertheless, the properties of emissivity have different applications in different fields.…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing time and annealing atmosphere on infrared emissivity property of Zn1-xCoxO by solid state reaction

Zhu¹,

Tan²,

Xu³

et al. 2017

Proceedings of the 2017 2nd International Conference on Materials Science, Machinery and Energy Engineering (MSMEE 2017)

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The Zn 1-x Co x O powders were synthesized by solid-state reaction at different annealing time and annealing atmosphere. The effects of annealing time and annealing atmosphere on the structure, morphologies and infrared emissivities have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible absorption spectroscopy and IR-2 dual-band infrared emissometer. The results indicate that the Zn 1-x Co x O samples have hexagonal wurtzite structure while the peaks of the secondary phase, Co, were observed when sintering at N 2 atmosphere. The annealing time and annealing atmosphere have important impacts on the microstructure and the infrared radiation properties of Zn 1-x Co x O nanopowders. UV-visible absorption spectra showed that Co ions substituted the Zn ions in the ZnO lattices. And the infrared emissivity depends on the microstructure, grain size and lattice vibration.

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Co-Doped ZnO Nanoparticles: Structural, Morphological, Optical, Magnetic and Antibacterial Studies

Cited by 81 publications

References 56 publications

Structural, optical, thermoelectrical, and magnetic study of Zn_1‐xCo_xO (0 ≤ x ≤ 0.10) nanocrystals

Structural, optical, thermoelectrical, and magnetic study of Zn_1‐xCo_xO (0 ≤ x ≤ 0.10) nanocrystals

Photocatalytic and Antibacterial Activity Studies of ZnO Nanoparticles Synthesized by Thermal Decomposition of Mechanochemically Processed Oxalate Precursor

Effect of annealing time and annealing atmosphere on infrared emissivity property of Zn1-xCoxO by solid state reaction

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Co-Doped ZnO Nanoparticles: Structural, Morphological, Optical, Magnetic and Antibacterial Studies

Cited by 81 publications

References 56 publications

Structural, optical, thermoelectrical, and magnetic study of Zn1‐xCoxO (0 ≤ x ≤ 0.10) nanocrystals

Structural, optical, thermoelectrical, and magnetic study of Zn1‐xCoxO (0 ≤ x ≤ 0.10) nanocrystals

Photocatalytic and Antibacterial Activity Studies of ZnO Nanoparticles Synthesized by Thermal Decomposition of Mechanochemically Processed Oxalate Precursor

Effect of annealing time and annealing atmosphere on infrared emissivity property of Zn1-xCoxO by solid state reaction

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Product

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Structural, optical, thermoelectrical, and magnetic study of Zn_1‐xCo_xO (0 ≤ x ≤ 0.10) nanocrystals

Structural, optical, thermoelectrical, and magnetic study of Zn_1‐xCo_xO (0 ≤ x ≤ 0.10) nanocrystals