Physical structure and optical properties of Co-doped ZnO nanoparticles prepared by co-precipitation

He, Rongliang; Tang, Bin; Ton-That, Cuong; Phillips, M. R.; Tsuzuki, Takuya

doi:10.1007/s11051-013-2030-6

Cited by 57 publications

(28 citation statements)

References 42 publications

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“…The peaks at 566, 611 and 656 nm are attributed to 4 A 2 (F) / 2 A 1 (G), 4 A 2 (F) / 4 T 1 (P), 4 A 2 (F) / 2 E(G). Similar behaviors were observed in Co-doped ZnO nanoparticle grown by different method such as co-precipitation method [60] and freeze-drying route [61]. The Zn 2þ sites in the wurtzite crystal structure have a tetrahedral coordination, while Co 2þ sites in CoO are six coordinate in the NaCl structure.…”

Section: Magnetic Propertiessupporting

confidence: 69%

“…The red-shift in the band gap energy is also reported for different nanoparticles showing ferromagnetic behavior, such as Co-doped ZnO nanoparticles [60,64], weakly Mn-doped ZnO [7] and other DMS, such as Mn-doped ZnSe and Mn-doped CdZnTe [65,66]. This provides strong evidences of an effect of the magnetic order in these DMS on the energy gap.…”

Section: Optical Propertiesmentioning

confidence: 55%

“…9(b) shows the Tauc Plots, (F(R)*hy) 2 versus hy, of Zn 1-x Co x O nanoparticles with different Co doping. Since ZnO is a direct band gap semiconductor, the band gab energy is obtained by extrapolating the linear portion of the Tauc Plots to the (F(R)*hy) 2 ¼ 0 [60,62]. The effect of Co doping on the energy band gab of Zn 1-x Co x O nanoparticles is shown in the inset Fig.…”

Section: Optical Propertiesmentioning

confidence: 99%

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Magnetic and optical properties of Co-doped ZnO nanocrystalline particles

Shatnawi

Alsmadi

Bsoul

et al. 2016

Journal of Alloys and Compounds

115

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Section: Magnetic Propertiessupporting

confidence: 69%

Section: Optical Propertiesmentioning

confidence: 55%

Section: Optical Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Magnetic and optical properties of Co-doped ZnO nanocrystalline particles

Shatnawi

Alsmadi

Bsoul

et al. 2016

Journal of Alloys and Compounds

115

View full text Add to dashboard Cite

“…On the other hand, Rongliang et.al. [12] reported that cobalt doping more than 5% doping levels in ZnO nanoparticles does not influence on the size and shape of the nanoparticles. The difference in size of the particles could be due to different preparation methods.…”

Section: Resultsmentioning

confidence: 99%

Structural, Optical and Electrical Properties of Cobalt Doped ZnO Quantum Dots

Tiwari¹

2016

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In this study we investigated the optical and electronic properties of cobalt doped Zinc Oxide (ZnO) nanoparticles (quantum dots) fabricated by a precipitation method. We observed significant reduction in ZnO nanoparticle diameter as we increased the percentage of cobalt. UV-VIS absorption measurement show a systematic increase in bandgap from 3.40 eV to 3.69 eV as the cobalt percentage is increased from 0 to 15%. This increase in bandgap is consistent with the confinement effects observed in quantum dots. Photoluminescence studies show a blue shift in near band absorption as the cobalt doping percentage is increased from 0% to 15%. Fluorescence life time measurements of the doped and undoped ZnO samples show a reduction in radiative life time as the cobalt percentage is increased. Electrical properties of doped and undoped samples show that the series resistance in a Cole-Cole plot decreases systematically with higher doping percentage. We will discuss the quantitative changes observed in structural, optical and electrical properties of ZnO quantum dots as the doping percentage is varied from 0 -15%.

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“…The magnetic behaviour of samples also affects the band gap of materials. The red shift in the band gap of DMS has been observed by some authors [35][36][37][38]. The ferromagnetism in cobalt-doped ZnO is due to localised magnetic moments mediated by free charge carriers.…”

Section: Uv-vis Spectroscopymentioning

confidence: 64%

Investigations on absorption, photoluminescence and magnetic properties of ZnO: Co nanoparticles

Kumar

Pandey

2016

J Sol-Gel Sci Technol

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We have investigated the consequences of cobalt (Co) incorporation with different doping concentrations (0, 2, 4 and 6 %) on structural, optical and magnetic properties of ZnO nanoparticles. The results of X-ray diffraction spectra (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED) pattern of single particle, energydispersive X-ray spectroscopy (EDS) and Fourier transform infrared (FT-IR) authenticate the substitution of cobalt and hexagonal crystal structure without any secondary phase formation of all the samples under investigation. The ultravioletvisible (UV-Vis) absorption study indicates that increase in Co concentration improves the visible region absorption (550-700 nm). The absorption edge of Co-doped ZnO shifts towards visible region with increase in Co concentration. The band gap of samples shows a red shift with increase in Co percentage. The photoluminescence (PL) study of the samples indicates that Co doping shifts the intense peak position of ZnO from violet to blue colour. The weak emission peak at 572 nm is also observed in all the samples. The emission is represented by chromaticity diagram. The room temperature magnetic properties have been studied using vibrating sample magnetometer (VSM). The room temperature magnetisation curve shows that an increase in Co concentration increases the linear behaviour of M-H loop. The magnetic susceptibility results indicate that all the samples have Curie-Weiss behaviour. The coercive field (H c ) and the remanence magnetisation (M r ) increase with Co doping concentration. Graphical Abstract Fig. M-H curve of pure and cobaltdoped ZnO nanoparticles at 300 K. Inset (a) shows absorption spectra, and inset (b) shows the emission spectra of Zn 1-x Co x O nanoparticles.

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Physical structure and optical properties of Co-doped ZnO nanoparticles prepared by co-precipitation

Cited by 57 publications

References 42 publications

Magnetic and optical properties of Co-doped ZnO nanocrystalline particles

Magnetic and optical properties of Co-doped ZnO nanocrystalline particles

Structural, Optical and Electrical Properties of Cobalt Doped ZnO Quantum Dots

Investigations on absorption, photoluminescence and magnetic properties of ZnO: Co nanoparticles

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