X-ray study of the structure and magnetic property of the co-doped ZnO nanoparticles prepared by thermal hydrolysis

Recently, transition metal (TM) and rare earth ion doped II–VI semiconductor nanoparticles have received much attention because such doping can modify and improve optical properties of II–VI semiconductor nanoparticles by large amount. In this study, undoped, La doped and La+Ag co-doped ZnO nano particles have been successfully synthesized by sol-gel method using the mixture of Zinc acetate dihydrate and ethanol solution. The powders were calcinated at 600 °C for 2 h. The effect of lanthanum and lanthanum-silver incorporation on the structure, morphology, optical and electrical conductivity were examined by X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Energy Dispersive X-ray Absorption (EDAX), Fourier transform infrared spectroscopy (FTIR), UV and Photo Luminescence (PL) Characterization. The average particle size of the synthesized ZnO nanoparticles is calculated using the Scherrer formula and is found to be of less than 20 nm. Luminescences properties were found to be enhanced for the La and La+Ag co-doped ZnO nanoparticles.

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Mg and La Co-doped ZnO Nanoparticles Prepared by Sol–gel Method: Synthesis, Characterization and Photocatalytic Activity

Periodica Polytechnica Chemical Engineering ◽

10.3311/ppch.12959 ◽

2019 ◽

Vol 64 (1) ◽

pp. 61-74 ◽

Cited By ~ 7

Author(s):

Behnam Khanizadeh ◽

Morteza Khosravi ◽

Mohammad A. Behnajady ◽

Ali Shamel ◽

Behrouz Vahid

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Zno Nanoparticles ◽

Sol Gel ◽

Bet Surface Area ◽

Gel Method ◽

X Ray ◽

Sol Gel Method ◽

Doped Zno ◽

Co Doped

In this study, La and Mg doped, and co-doped ZnO nanoparticles were prepared using the sol-gel method. The prepared samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (DRS), and N2 physisorption techniques. The XRD results indicated that the prepared nanoparticles can be well adopted by the hexagonal wurtzite structure crystal and there are no second impurity peaks. Studies of the FESEM, EDX and TEM have shown that the samples have uniform spherical-like morphology with a homogenous distribution. The incorporation of La and Mg into the ZnO lattice had no effect on the morphology of the nanoparticles, but a reduction in the size of the grains (≈ 14 nm to ≈ 7 nm) was observed due to the insertion of these ions. The results of N2 physisorption indicated that there was an increase in BET surface area and pore volume for doped and co-doped samples. The results of DRS showed an increase in band gap energy and a blue shift at the absorption edge for doped and co-doped samples. The photocatalytic activity of the prepared catalysts was evaluated in the removal of RhB under UVA irradiation. The results showed that Mg5%-La5%/ZnO had the highest photoactivity (91.18 %) among all samples.

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STRUCTURAL CHARACTERIZATION OF Co-DOPED ZnO NANOPARTICLES USING X-RAY DIFFRACTION AND RAMAN SPECTROSCOPY

10.5151/phypro-sic100-072 ◽

2015 ◽

Author(s):

T. J. Castro ◽

S. W. da Silva ◽

F. Nakagomi ◽

A. Franco Júnior ◽

H. V. S. Pessoni ◽

...

Keyword(s):

Raman Spectroscopy ◽

Structural Characterization ◽

Zno Nanoparticles ◽

X Ray Diffraction ◽

X Ray ◽

Doped Zno ◽

Co Doped

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Structural and Morphological Properties of Ag and In Co-Doped ZnO Nanoparticles Synthesized by Sol-Gel Method

Nano Hybrids and Composites ◽

10.4028/www.scientific.net/nhc.17.101 ◽

2017 ◽

Vol 17 ◽

pp. 101-105 ◽

Cited By ~ 3

Author(s):

V. Porkalai ◽

B. Sathya ◽

Durairaj Benny Anburaj ◽

G. Nedunchezhian ◽

R. Meenambika

Keyword(s):

Zno Nanoparticles ◽

Sol Gel ◽

Average Particle Size ◽

Morphological Properties ◽

Average Particle ◽

Gel Method ◽

X Ray ◽

Sol Gel Method ◽

Doped Zno ◽

Co Doped

Zinc oxide has been receiving an enormous attention due to its potential applications in a variety of field such as optoelectronics, spintronics and sensors. Ag and In co-doped ZnO nanoparticles with different doping concentration 0.1M, 0.2M and 0.3M were prepared by sol-gel method via microwave irradiation followed by calcinations at 600°C for 2h. The structure and morphology were examined by X-ray diffraction (XRD), and Scanning Electron Microscope (SEM), respectively. Elemental composition has been estimated by Energy Dispersive X-ray Absorption (EDAX), while chemical properties are studied by Fourier transform infrared spectroscopy (FTIR) and X-ray Photoelectron Spectroscopy (XPS) . The average particle size of the synthesized ZnO nanoparticles was calculated using the Scherrer formula and is found to be of less than 20 nm. Also the effect on the structure and the morphological properties of ZnO when co-doped with silver and Indium is examined. As the process is simple and low cost, it has the potential to be produced on a large scale.

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Photoluminescence and Magnetic Properties of Undoped and (Mn, Co) co-doped ZnO Nanoparticles

Current Nanoscience ◽

10.2174/1573413715666191010162626 ◽

2020 ◽

Vol 16 (4) ◽

pp. 655-666

Author(s):

Mona Rekaby

Keyword(s):

Magnetic Properties ◽

Zno Nanoparticles ◽

Room Temperature ◽

Magnetic Measurements ◽

Structural Defects ◽

Ferromagnetic Behavior ◽

Secondary Phases ◽

Antiferromagnetic Ordering ◽

Doped Zno ◽

Co Doped

Objective: The influence of Manganese (Mn2+) and Cobalt (Co2+) ions doping on the optical and magnetic properties of ZnO nanoparticles was studied. Methods: Nanoparticle samples of type ZnO, Zn0.97Mn0.03O, Zn0.96Mn0.03Co0.01O, Zn0.95Mn0.03 Co0.02O, Zn0.93Mn0.03Co0.04O, and Zn0.91Mn0.03Co0.06O were synthesized using the wet chemical coprecipitation method. Results: X-ray powder diffraction (XRD) patterns revealed that the prepared samples exhibited a single phase of hexagonal wurtzite structure without any existence of secondary phases. Transmission electron microscope (TEM) images clarified that Co doping at high concentrations has the ability to alter the morphologies of the samples from spherical shaped nanoparticles (NPS) to nanorods (NRs) shaped particles. The different vibrational modes of the prepared samples were analyzed through Fourier transform infrared (FTIR) measurements. The optical characteristics and structural defects of the samples were studied through Photoluminescence (PL) spectroscopy. PL results clarified that Mn2+ and Co2+ doping quenched the recombination of electron-hole pairs and enhanced the number of point defects relative to the undoped ZnO sample. Magnetic measurements were carried out at room temperature using a vibrating sample magnetometer (VSM). (Mn, Co) co-doped ZnO samples exhibited a ferromagnetic behavior coupled with paramagnetic and weak diamagnetic contributions. Conclusion: Mn2+ and Co2+ doping enhanced the room temperature Ferromagnetic (RTFM) behavior of ZnO. In addition, the signature for antiferromagnetic ordering between the Co ions was revealed. Moreover, a strong correlation between the magnetic and optical behavior of the (Mn, Co) co-doped ZnO was analyzed.

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Optimizing physical properties of Co-doped ZnO nanoparticles: Controlling oxygen vacancy and carrier concentration

Vacuum ◽

10.1016/j.vacuum.2021.110488 ◽

2021 ◽

pp. 110488

Author(s):

Huying Yan ◽

Jian Xue ◽

Wenjing Chen ◽

Jialing Tang ◽

Ling zhong ◽

...

Keyword(s):

Oxygen Vacancy ◽

Physical Properties ◽

Carrier Concentration ◽

Zno Nanoparticles ◽

Doped Zno ◽

Co Doped

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Properties of Cu and V co-doped ZnO nanoparticles annealed in different atmospheres

Superlattices and Microstructures ◽

10.1016/j.spmi.2012.09.001 ◽

2012 ◽

Vol 52 (6) ◽

pp. 1171-1177 ◽

Cited By ~ 4

Author(s):

Huilian Liu ◽

Xin Cheng ◽

Hongbo Liu ◽

Jinghai Yang ◽

Yang Liu ◽

...

Keyword(s):

Zno Nanoparticles ◽

Doped Zno ◽

Co Doped

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Magnetic properties of Co-doped ZnO nanoparticles prepared by vaporization-condensation in a solar reactor

Journal of Applied Physics ◽

10.1063/1.1848440 ◽

2005 ◽

Vol 97 (10) ◽

pp. 10D311 ◽

Cited By ~ 15

Author(s):

B. Martínez ◽

F. Sandiumenge ◽

Ll. Balcells ◽

J. Fontcuberta ◽

F. Sibieude ◽

...

Keyword(s):

Magnetic Properties ◽

Zno Nanoparticles ◽

Solar Reactor ◽

Doped Zno ◽

Co Doped

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Effect of cobalt doping on microstructures and dielectric properties of ZnO

Canadian Journal of Chemistry ◽

10.1139/cjc-2018-0195 ◽

2019 ◽

Vol 97 (3) ◽

pp. 227-232 ◽

Cited By ~ 1

Author(s):

Ye Zhao ◽

Fan Tong ◽

Mao Hua Wang

Keyword(s):

Zno Nanoparticles ◽

Sol Gel ◽

Hexagonal Wurtzite Structure ◽

Sem Analysis ◽

Co Doping ◽

In Doping ◽

Zno Powders ◽

Doped Zno ◽

Zno Crystal ◽

Co Doped

Pure and cobalt-doped ZnO nanoparticles (2.5, 5, 7.5, and 10 atom % Co) are synthesized by sol–gel method. The as-synthesized nanoparticles are characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and field emission scanning electron microscopy (FE-SEM) analysis. The nanoparticles of 0, 2.5, and 5 atom % Co-doped ZnO exhibited hexagonal wurtzite structure and have no other phases. Moreover, the (101) diffraction peaks position of Co-doped ZnO shift toward a smaller value of diffraction angle compared with pure ZnO powders. The results confirm that Co ions were well incorporated into ZnO crystal lattice. Simultaneously, Co doping also inhibited the growth of particles, and the crystallite size decreased from 43.11 nm to 36.63 nm with the increase in doping concentration from 0 to 10 atom %. The values of the optical band gap of all Co-doped ZnO nanoparticles gradually decreased from 3.09 eV to 2.66 eV with increasing Co content. Particular, the dielectric constant of all Co-doped ZnO ceramics gradually increased from 1.62 × 103 to 20.52 × 103, and the dielectric loss decreased from 2.36 to 1.28 when Co content increased from 0 to 10 atom %.

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