Synthesis and Structural Properties of (Co, Al) Co-Doped ZnO Nanoparticles

2018 ◽  
Vol 24 (8) ◽  
pp. 5636-5639
Author(s):  
P Swapna ◽  
S. Venkatramana Reddy
Keyword(s):  
Zno Nanoparticles ◽  
Lattice Site ◽  
Secondary Phase ◽  
Hexagonal Wurtzite Structure ◽  
Host Lattice ◽  
X Ray Diffraction ◽  
Local Vibration ◽  
Doped Zno ◽  
Co Doped ◽  
Prominent Peak

Pristine and (Co, Al) co-doped ZnO nanoparticles have been successfully synthesized by chemical coprecipitation method without using capping agent and annealed in the furnace at 500 °C for one hour. The aluminium concentration is fixed at 5 mol% and cobalt concentration is increasing from 1 to 3 mol%. X-ray diffraction results shows that all the samples possess hexagonal wurtzite structure of ZnO having no secondary phase after adding of aluminium and cobalt, which may be ascribed to the incorporation of cobalt an aluminium ions into the Zinc oxide host lattice site rather than interstitial. Non-uniform spherical nanoparticles were observed through SEM and the elemental analysis is determined through Energy dispersive spectroscopy (EDS). Raman spectrum shows that the prominent peak appeared at 530 cm−1, for co-doped samples which is attributed to the local vibration mode corresponds to cobalt bound with the donor defects.

Effect of cobalt doping on microstructures and dielectric properties of ZnO

2019 ◽  
Vol 97 (3) ◽  
pp. 227-232 ◽  
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 %.

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

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

Dependence of the electrical properties of Cu-doped ZnO nanoparticles decorated by Ag atoms

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Abueliz Modwi ◽  
Kamal K. Taha ◽  
Lotfi Khezami ◽  
Mohamed Boudina ◽  
Mohamed Khairy ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Zno Nanoparticles ◽  
Sol Gel ◽  
Great Influence ◽  
Impedance Measurement ◽  
Host Lattice ◽  
X Ray Diffraction ◽  
Electrical Measurements ◽  
Nyquist Plots ◽  
Doped Zno

AbstractSilver decorated copper doped zinc oxide nanoparticles (Ag@Cu-ZnO) were successfully prepared via sol gel method. X-ray diffraction analysis revealed ZnO wurtzite crystalline structure with the existence of minor peaks attributed to Cu and Ag. The presence of Cu and Ag in addition to ZnO lattice was supplementary verified by EDS data while the shift in the FTIR band confirmed the Cu incorporation within the ZnO host lattice. Both SEM and XRD revealed an increase in particle size with Ag loading. At different frequencies, electrical measurements demonstrated a decrement in the dielectric constant, dielectric loss and AC conductivity with the increment of Ag content. Meanwhile, the Nyquist plots of the impedance measurement showed a single semicircle arc indicating the predominance of grain boundary resistance. This study elucidated the great influence of Ag on Cu-doped ZnO nanoparticles’ structural, dielectric constant and electrical conductivity which make it a promising candidate for catalytic, photocatalytic and adsorption applications.

scholarly journals Structural and optical characteristic of 1-(4-Methylsulfonyl Phenyl)-3-(4-n, n Dimethyl (amino Phenyl)-2-Propen- 1-One (MSPPP) Chalcone doped ZnO nanoparticles

NanoNEXT ◽  
2021 ◽  
pp. 28-34
Author(s):  
Mohana F. Attia ◽  
Abdelrahman A. Elbadawi
Keyword(s):  
Zno Nanoparticles ◽  
Diffuse Reflection ◽  
Energy Gap ◽  
Hexagonal Wurtzite Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Crystallite Sizes ◽  
Order Of Magnitude ◽  
Doped Zno

The purpose of this paper is to investigate the structural and optical characteristics of 1-(4-Methylsulfonyl Phenyl)-3-(4-n, n Dimethyl (amino Phenyl)-2-Propen- 1-One (MSPPP) Chalcone doped in ZnO nanoparticles. Part of the aim is to study the characterization of chalcone doped ZnO nanoparticles by several techniques such as X-ray diffraction, Scanning electron microscope, FTIR spectroscopy, and diffuse reflection spectra.  All doped samples showed a hexagonal wurtzite structure. This study has shown that the crystallite size of pure ZnO varied from 23.50 to 27.45 nm and when increasing the chalcone percentage by 0.5 and 1.5%, has increased the crystallite sizes in the range of 33.40–33.80 nm and 33.80–36.20 nm, respectively. The value of the energy gap (Eg) for ZnO nanoparticles was 3.14 eV. For 0.5 and 1.5% chalcone doped ZnO, the energy gap decreased by an order of magnitude 0.16 eV.

Dependence of the electrical properties of Cu-doped ZnO nanoparticles decorated by Ag atoms

2020 ◽  
Vol 235 (6) ◽  
pp. 745-767
Author(s):  
Abueliz Modwi ◽  
Kamal K. Taha ◽  
Lotfi Khezami ◽  
Mohamed Boudina ◽  
Mohamed Khairy ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Zno Nanoparticles ◽  
Sol Gel ◽  
Great Influence ◽  
Impedance Measurement ◽  
Host Lattice ◽  
X Ray Diffraction ◽  
Electrical Measurements ◽  
Nyquist Plots ◽  
Doped Zno

Abstract Silver decorated copper doped zinc oxide nanoparticles (Ag@Cu-ZnO) were successfully prepared via sol gel method. X-ray diffraction analysis revealed ZnO wurtzite crystalline structure with the existence of minor peaks attributed to Cu and Ag. The presence of Cu and Ag in addition to ZnO lattice was supplementary verified by EDS data while the shift in the FTIR band confirmed the Cu incorporation within the ZnO host lattice. Both SEM and XRD revealed an increase in particle size with Ag loading. At different frequencies, electrical measurements demonstrated a decrement in the dielectric constant, dielectric loss and AC conductivity with the increment of Ag content. Meanwhile, the Nyquist plots of the impedance measurement showed a single semicircle arc indicating the predominance of grain boundary resistance. This study elucidated the great influence of Ag on Cu-doped ZnO nanoparticles’ structural, dielectric constant and electrical conductivity which make it a promising candidate for catalytic, photocatalytic and adsorption applications.

scholarly journals Structural, optical and antibacterial properties of yttriumdoped ZnO nanoparticles

Cerâmica ◽  
2015 ◽  
Vol 61 (360) ◽  
pp. 457-461 ◽  
Author(s):  
V. D. Mote ◽  
Y. Purushotham ◽  
R. S. Shinde ◽  
S. D. Salunke ◽  
B. N. Dole
Keyword(s):  
Zno Nanoparticles ◽  
Antimicrobial Agents ◽  
Antibacterial Properties ◽  
Average Crystallite Size ◽  
Cost Effective ◽  
Hexagonal Wurtzite Structure ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Doped Zno ◽  
Co Precipitation

Abstract Yttrium-doped ZnO nanoparticles were synthesized by co-precipitation method to investigate structural, optical and antibacterial properties. X-ray diffraction analysis confirms hexagonal (wurtzite) structure with average crystallite size between 16 and 30 nm. Optical energy band gap decreaseswith increasing Y-doping concentration. ZnO nanoparticles were found to be highly effective against S. aureus and Y-doped ZnO nanoparticles against E. coli, B. subtilis and S. typhi. Undoped and Y-doped ZnO nanoparticles are good inorganic antimicrobial agents and can be synthesized by cost effective co-precipitation method.

Structural, Optical and Magnetic Properties of Nanocrystalline Co-Doped ZnO Thin Films Grown by Sol–Gel

2017 ◽  
Vol 73 (1) ◽  
pp. 13-21 ◽  
Author(s):  
Zohra Nazir Kayani ◽  
Iqra Shah ◽  
Bareera Zulfiqar ◽  
Saira Riaz ◽  
Shahzad Naseem ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Morphology ◽  
Sol Gel ◽  
Hexagonal Wurtzite Structure ◽  
Magnetic Surface ◽  
Zno Thin Films ◽  
Zno Films ◽  
X Ray Diffraction ◽  
Doped Zno ◽  
Co Doped

AbstractCobalt-doped ZnO thin films have been deposited using a sol–gel route by changing the number of coats on the substrate from 6 to 18. This project deals with various film thicknesses by increasing the number of deposited coats. The effect of thickness on structural, magnetic, surface morphology and optical properties of Co-doped ZnO thin film was studied. The crystal structure of the Co-doped ZnO films was investigated by X-ray diffraction. The films have polycrystalline wurtzite hexagonal structures. A Co2+ ion takes the place of a Zn2+ ion in the lattice without creating any distortion in its hexagonal wurtzite structure. An examination of the optical transmission spectra showed that the energy band gap of the Co-doped ZnO films increased from 3.87 to 3.97 eV with an increase in the number of coatings on the substrate. Ferromagnetic behaviour was confirmed by measurements using a vibrating sample magnetometer. The surface morphology of thin films was assessed by scanning electron microscope. The grain size on the surface of thin films increased with an increase in the number of coats.

scholarly journals Effect of calcination temperature on the structural, optical and magnetic properties of pure and Fe-doped ZnO nanoparticles

2016 ◽  
Vol 34 (2) ◽  
pp. 451-459 ◽  
Author(s):  
Raminder Preet Pal Singh ◽  
I.S. Hudiara ◽  
Shashi Bhushan Rana
Keyword(s):  
Magnetic Properties ◽  
Calcination Temperature ◽  
Zno Nanoparticles ◽  
Average Crystallite Size ◽  
Hexagonal Wurtzite Structure ◽  
Ferric Nitrate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Magnetization Saturation ◽  
Doped Zno

AbstractIn the present study, pure ZnO and Fe-doped ZnO (Zn0.97Fe0.03O) nanoparticles were synthesized by simple coprecipitation method with zinc acetate, ferric nitrate and sodium hydroxide precursors. Pure ZnO and Fe-doped ZnO were further calcined at 450 °C, 600 °C and 750 °C for 2 h. The structural, morphological and optical properties of the samples were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS) and UV-Vis absorption spectroscopy. The X-ray diffraction studies revealed that the as-synthesized pure and doped ZnO nanoparticles have hexagonal wurtzite structure. The average crystallite size was calculated using Debye-Scherrer’s formula. The particle size was found to be in nano range and increased with an increase in calcination temperature. SEM micrographs confirmed the formation of spherical nanoparticles. Elemental compositions of various elements in pure and doped ZnO nanoparticles were determined by EDX spectroscopy. UV-Vis absorption spectra showed red shift (decrease in band gap) with increasing calcination temperature. Effect of calcination on the magnetic properties of Fe-doped ZnO sample was also studied using vibrating sample magnetometer (VSM). M-H curves at room temperature revealed that coercivity and remanent polarization increase with an increase in calcination temperature from 450 °C to 750 °C, whereas reverse effect was observed for magnetization saturation.

scholarly journals Synthesis, structural and optical properties of Mn doped ZnO nanoparticles and their antibacterial application

2016 ◽  
Vol 12 (12) ◽  
pp. 4593-4600
Author(s):  
A. Srithar ◽  
J.C. Kannan ◽  
T.S. Senthil
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
Zno Nanoparticles ◽  
Hexagonal Wurtzite Structure ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Doped Zno ◽  
Mn Doped

In the present investigation, MnxZn1-xO (x = 0.05, 0.075 and 0.1%) nanoparticles have been synthesized by simple precipitation method. Their structural, morphological and optical properties were examined by using X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), Energy dispersive X-ray spectroscopy (EDX), High resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, Differential scanning calorimetry (DSC) and UV-Visible spectroscopy. The Powder X-ray diffraction studies confirmed that the manganese doped ZnO have a single phase nature with hexagonal wurtzite structure and Mn successfully incorporated into the lattice position of Zn in ZnO lattice. The FESEM and HRTEM images are coincided with each other for aggregation of particles in nature. The elemental analysis of doped samples has been evaluated by EDX. The antibacterial activity of Mn doped ZnO nanoparticles has also been examined.

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

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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