Optical Properties of Co-Doped Zno Nano Powder Material Prepared by Ball Milling

2011 ◽  
Vol 143-144 ◽  
pp. 190-193
Author(s):  
Song Ning Xu ◽  
Z.Q. Cai ◽  
N.K. Sun ◽  
Y.B. Gao ◽  
F. Liu
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Ball Milling ◽  
Blue Emission ◽  
Peak Position ◽  
Hexagonal Structure ◽  
Photoluminescence Spectra ◽  
Doped Zno ◽  
Zno Crystal ◽  
Co Doped

Zn1-xCoxO nano powders have been successfully prepared by ball milling and have been annealing at 600°C. The crystal structure and optical properties of sample were characterized by X-ray diffraction (XRD), photoluminescence spectra (PL) and ultraviolet visible light absorption spectra (UV), and the formation mechanism was discussed. Co-doped ZnO nano powders exhibit wurtzite (hexagonal) structure. Co2+enters into ZnO crystal structure and substitutes for Zn2+. All samples show typical luminescence behavior with about 396nm UV emission peak. In addition, the about 450nm and 470nm blue emission peaks are found in photoluminescence spectra. Before the doped content is within 8at%, the band edge of ultraviolet absorption appears red shift phenomenon with the increase of doping content. The peak position was shifted from 362nm (3.43eV) to 367nm (3.38eV). Annealing is in favor of the replacement that Co2+enters into ZnO crystal structure and substitutes for Zn2+

Effect of the Sols’ Zinc Ions’ Concentration on Structural and Optical Properties of (Cu, Al) Co-Doped ZnO Thin Film by Sol - Gel Method

2014 ◽  
Vol 496-500 ◽  
pp. 206-209
Author(s):  
Ying Xiang Yang ◽  
Hong Lin Tan ◽  
Qing Nan Shi
Keyword(s):  
Sol Gel ◽  
Blue Emission ◽  
Electron Transition ◽  
Photoluminescence Spectra ◽  
Zinc Vacancy ◽  
Structural And Optical Properties ◽  
Gel Method ◽  
Sol Gel Method ◽  
Doped Zno ◽  
Co Doped

(Cu-Al) co-doped ZnO thin films were deposited on glass substrate by the sol-gel method using the spin coating technique.The crystalline phase structure of the films were analyzed by X-raydiffraction.The photoluminescence spectra of samples were measured by fluorescence spectrophotometer.The results show that these films have a compact hexagonal wurtzitetype structure. five peaks have been observed from the PL spectra of the all samples,367nm (3.38eV),398nm (3.12eV),450nm (2.759eV),483nm (2.57eV) and 468nm (2.653eV).It is concluded that the violet peak may correspond to the excit on emission,the blue emission corresponds to the electron transition from the bottom of the conduction band to the accept or level of zinc vacancy.

Enhanced optical properties of Cd–Mg-co-doped ZnO nanoparticles induced by low crystal structure distortion

2020 ◽  
Vol 146 ◽  
pp. 109611
Author(s):  
Onyekachi Kalu ◽  
Maria R. Correia ◽  
Andrés Cantarero ◽  
Harby Alexander Martinez-Rodriguez ◽  
José Alberto Duarte-Moller ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Zno Nanoparticles ◽  
Doped Zno ◽  
Co Doped

Preparation and Characterization of Ag and Co Doped ZnO Nano Particles

2012 ◽  
Vol 584 ◽  
pp. 248-252
Author(s):  
B. Sankara Reddy ◽  
S. Venkatramana Reddy ◽  
R.P. Vijaya Lakshmi ◽  
N. Koteeswara Reddy
Keyword(s):  
Blue Emission ◽  
Photo Luminescence ◽  
Hexagonal Structure ◽  
Nano Particles ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Doped Zno ◽  
Co Precipitation ◽  
Co Doped

Pure ZnO and Ag, Co doped ZnO nano particles [Zn1-xAgxCoyO, where x = 0.00 and 0.05, y = 0.05] were synthesized by chemical co precipitation method without use of surfactant. All the prepared samples calcinated in 1 hour at 500oC, after that the morphology of the samples were evaluated by Scanning Electron Microscope (SEM). The X- ray diffraction (XRD) results indicated that the synthesized co-doped ZnO nano crystals had the pure hexagonal structure without any significant change in the structure affected by Ag and Co substitution. Dopant elements Ag and Co are present in the ZnO host material and conformed by Energy Dispersive Analysis of X-ray Spectra (EDAX). The incorporation of Ag+ in the place of Zn2+ has made a considerable decrease in the size of nano crystals as compared to pure ZnO nano particles (It is to be noted that Co should be kept constant at 5 mol %). Blue emission was observed by Photo Luminescence (PL) Spectra.

The influence of Co content on the luminescence properties of Co-doped ZnO nanoparticles

2018 ◽  
Vol 32 (10) ◽  
pp. 1850112
Author(s):  
Shuxia Guo ◽  
Haitao Jiang
Keyword(s):  
Zno Nanoparticles ◽  
Blue Emission ◽  
Green Emission ◽  
Content Increase ◽  
Edge States ◽  
Photoluminescence Spectra ◽  
Uv Emission ◽  
Doped Zno ◽  
Co Precipitation ◽  
Co Doped

Co-doped ZnO nanoparticles have been synthesized by co-precipitation technique. Photoluminescence spectra change in the range from 350 nm to 600 nm and remain unchanged at about 690 nm with the Co content increase. The UV emission is assigned to exciton emission. The density of band-edge states increases with Co content. The blue emission could be ascribed to the recombination of electrons in Co[Formula: see text] ions and holes in the valence band, whose relative intensity and full-width at half-maximum (FWHM) increase with the increase of cobalt concentration. The red emission results from the intra-d-shell emission at Co, which is independent of Co content. The relative density and energy-level position of green emission centers are also influenced by Co content.

Synthesis and optical properties of Co-doped ZnO nanofibers prepared by electrospinning

Optik ◽  
2014 ◽  
Vol 125 (10) ◽  
pp. 2361-2364 ◽  
Author(s):  
Huawa Yu ◽  
Huiqing Fan ◽  
Xin Wang ◽  
Jing Wang
Keyword(s):  
Optical Properties ◽  
Zno Nanofibers ◽  
Doped Zno ◽  
Co Doped

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 Electronic Structure and Optical Properties of Co and Fe Doped ZnO

2016 ◽  
Vol 43 ◽  
pp. 23-28 ◽  
Author(s):  
Chun Ping Li ◽  
Ge Gao ◽  
Xin Chen
Keyword(s):  
Density Functional Theory ◽  
Optical Properties ◽  
Electronic Structures ◽  
Density Functional ◽  
Band Gaps ◽  
First Principle ◽  
Functional Theory ◽  
Doped Zno ◽  
Pseudo Potential ◽  
Co Doped

First-principle ultrasoft pseudo potential approach of the plane wave based on density functional theory (DFT) has been used for studying the electronic characterization and optical properties of ZnO and Fe, Co doped ZnO. The results show that the doping impurities change the lattice parameters a little, but bring more changes in the electronic structures. The band gaps are broadened by doping, and the Fermi level accesses to the conduction band which will lead the system to show the character of metallic properties. The dielectric function and absorption peaks are identified and the changes compared to pure ZnO are analyzed in detail.

The Room Temperature Ferromagnetism of (N, Co) Co-Doped ZnO Nanopaticles

2014 ◽  
Vol 577 ◽  
pp. 19-22
Author(s):  
Ping Cao ◽  
Yue Bai ◽  
Zhi Qu
Keyword(s):  
Zno Nanoparticles ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Crystal Lattices ◽  
Grown Sample ◽  
N Doping ◽  
Doped Zno ◽  
Zno Crystal ◽  
Zno Nanopaticles ◽  
Co Doped

Co-doped ZnO nanoparticles were fabricated by an electrodeposition method. The XPS results show Co ions have doped into the ZnO crystal lattices successfully. The as-grown sample has no ferromagnetism at room temperature. But after an ammine plasma treatment the room temperature ferromagnetism were detected on Co0.04Zn0.96O nanoparticles. The Hall measurement reveals after the treatment the resistivity increase by three orders of magnitude. Although the aspect conductivity is n type, some holes generated by N doping play an important role to induce the ferromagnetic properties for Co doped ZnO sample.

scholarly journals Correction: Optical properties and carrier dynamics in Co-doped ZnO nanorods

2021 ◽  
Author(s):  
Aswathi K. Sivan ◽  
Alejandro Galán-González ◽  
Lorenzo Di Mario ◽  
Nicolas Tappy ◽  
Javier Hernández-Ferrer ◽  
...  
Keyword(s):  
Optical Properties ◽  
Zno Nanorods ◽  
Carrier Dynamics ◽  
Doped Zno ◽  
Co Doped

Correction for ‘Optical properties and carrier dynamics in Co-doped ZnO nanorods’ by Aswathi K. Sivan et al., Nanoscale Adv., 2021, DOI: 10.1039/d0na00693a.

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