Tuning ferromagnetism in zinc oxide nanoparticles by chromium doping

Kaur, Palvinder; Pandey, S. K.; Kumar, Sanjeev; Negi, N. S.; Chen, C. L.; Rao, Shanta S.; Wu, Mengqi

doi:10.1007/s13204-014-0394-2

Cited by 20 publications

(6 citation statements)

References 37 publications

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“…This shows that the Cr ions had entered into the ZnO lattice. Palvinder Kaur et al 26 also observed the line broadening of XRD pattern due to the incorporation of Cr into the ZnO lattice. The peaks of ZnO shi towards higher angle with Cr doping, indicating that there is an increase in the c-axis lattice parameter aer Cr doping.…”

Section: Inuence Of Cr Doping On the Structure Of Zno Nanoparticlesmentioning

confidence: 90%

Enhanced antibacterial activity of Cr doped ZnO nanorods synthesized using microwave processing

2015

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In this work we concentrate on enhancing the antibacterial activity of ZnO nanoparticles by Cr doping, synthesized using a microwave assisted method. The obtained nanoparticles were systematically characterized by X-ray diffraction, Fourier transformation infrared spectroscopy, UV-Vis spectroscopy and field emission scanning microscopy, and the results were correlated. Powder diffraction patterns reveal that Cr is incorporated into the ZnO crystal lattice without disturbing the original wurtzite crystal structure. The vibrational spectra show significant shifts in the peaks with Cr addition, indicating the successful incorporation of Cr ions into ZnO. Optical absorption measurements reveal that the band gap of ZnO decreased from 3.19 to 3.09 eV, which confirmed the existence of a ZnO-Cr catalyst influence interaction. The surface morphology of ZnO changed from hexagonal rod to spherical-hexagonal nanorod structures after Cr doping. Energy dispersive spectral analysis confirms the phase-purity of the synthesized powders. Here, we show that in addition to altering the structure, composition, morphology and optical absorption characteristics of ZnO, the introduction of Cr dopant can also lead to dramatic changes in the antibacterial activity of Gram-negative (E. coli) and Gram-positive (S. aureus) bacteria. The investigated Cr doped ZnO nanocomposite material showed excellent antimicrobial activity compared to ZnO. The bacterial activity was found to be higher for Gram positive bacteria possessing thicker cell walls than that for Gram negative bacteria. ; Tel: +91 9994647287 † Electronic supplementary information (ESI) available. See

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Section: Inuence Of Cr Doping On the Structure Of Zno Nanoparticlesmentioning

confidence: 90%

Enhanced antibacterial activity of Cr doped ZnO nanorods synthesized using microwave processing

2015

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“…N can be incorporated in Cr doped ZnS lattice as p-type dopant, using the simple and inexpensive technique namely the chemical co-precipitation method. Our group have previously reported enhancement of magnetism in N and Cr co-doped ZnO nanoparticles [24]. There are no reports on magnetic studies of N and Cr co-doped ZnS nanoparticles.…”

Section: Introductionmentioning

confidence: 92%

Improved magnetism in Cr doped ZnS nanoparticles with nitrogen co-doping synthesized using chemical co-precipitation technique

Kaur

Kumar

Singh

et al. 2015

J Mater Sci: Mater Electron

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2 % Cr doped ZnS nanoparticles were synthesized using chemical co-precipitation technique. Powder X-ray diffraction reveals that Cr incorporates into the ZnS crystal lattice without troubling the original cubic structure. Transmission electron microscopy measurements show that the average size of these nanoparticles is in the range 3-4 nm. Room temperature photoluminescence studies show the increase in defects with increase in nitrogen codoping. 2 % Cr doped ZnS exhibit hysteresis loop at room temperature indicating the magnetic behavior with diamagnetic contribution with increase in applied field. Increase in nitrogen co-doping along with Cr in ZnS shows enhanced ferromagnetism with saturated magnetization.

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“…Further, the decrease of saturation magnetization is caused by the expanded particle size after the addition of ZnO nanoparticles. The increase of particle size decreases surface to volume ratio, resulting in a lower contribution of surface spin toward the magnetic moment within the nanocomposite and reduced saturation magnetization [35]. Besides, the coercivity field (Hc) value tends to increase following the increase of ZnO composition, so that it has excellent application potential as storage and absorption for microwave (MAM).…”

Section: Fig 2 Ftir Spectra Of the Fe2o3/mwcnt/zno Nanocompositesmentioning

confidence: 99%

Effect of ZnO Mass on Nanostructure, Magnetic and Optical Properties of Fe2O3/MWCNT/ZnO Nanocomposites

Shalihah

Subadra

Nashikudin

et al. 2021

JMA

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Fe2O3/MWCNT/ZnO nanocomposites were successfully synthesized through the precipitation method. The synthesis was carried out through a variation of ZnO mass, with (Fe2O3/MWCNT):ZnO mass ratio of 1:0, 1:0.5, 1:1, 1:1.5, and 0:1. The XRD analysis results suggested that the nanocomposites were composed of two phases, namely Fe2O3 with centered hexagonal structure and ZnO with hexagonal wurtzite structure. The ZnO diffraction peak tended to increase following the increasing ZnO composition within the nanocomposites. The presence of MWCNT was confirmed by the FTIR results signifying the detection of C=C vibration at wavenumbers of 1631-1640 cm -1 . The crystallite size of Fe2O3 and ZnO was in the range of 30.97-31.12 nm and 30.46-35.64 nm, respectively. The nanocomposites were comprised of the spherical, tube, and sheet particles, representing Fe2O3, MWCNT, and ZnO, respectively, with particle size ranged from 33.97 nm to 55.19 nm. The nanocomposites were observed to present weak ferromagnetic, with a decrease in saturation magnetization value following the increase of ZnO composition. The optical properties of the nanocomposites tended to decrease as the increasing ZnO composition.

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Tuning ferromagnetism in zinc oxide nanoparticles by chromium doping

Cited by 20 publications

References 37 publications

Enhanced antibacterial activity of Cr doped ZnO nanorods synthesized using microwave processing

Enhanced antibacterial activity of Cr doped ZnO nanorods synthesized using microwave processing

Improved magnetism in Cr doped ZnS nanoparticles with nitrogen co-doping synthesized using chemical co-precipitation technique

Effect of ZnO Mass on Nanostructure, Magnetic and Optical Properties of Fe2O3/MWCNT/ZnO Nanocomposites

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