Structural and Optical Properties of ZnCoO Thin Film Prepared by Electrodeposition

2013 ◽  
Vol 781-784 ◽  
pp. 323-326 ◽  
Author(s):  
Ping Cao ◽  
Yue Bai
Keyword(s):  
Thin Film ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cathodic Electrodeposition ◽  
Uv Emission ◽  
Diluted Magnetic ◽  
Zno Crystal ◽  
Zn Ions

An oxide diluted magnetic semiconductor, Co doped ZnO thin film was successfully fabricated by cathodic electrodeposition method. X-ray diffraction studies demonstrate that the ZnCoO thin film indicates that the wurtzite structure. X-ray photospectroscopy studies suggested Co ions have a chemical valence of 2+. Optical absorption spectrum further confirmed Co ions have been doped into ZnO crystal lattice successfully with substituting positions of Zn ions. In photoluminescence spectrum, the UV emission band shifted to low energy side because of the doping effect.

scholarly journals Dilute Magnetic SemiconductorCu2FeSnS4Nanocrystals with a Novel Zincblende Structure

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Xiaolu Liang ◽  
Xianhua Wei ◽  
Daocheng Pan
Keyword(s):  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Ferromagnetic Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Nir Absorption ◽  
Diluted Magnetic ◽  
Average Size

Diluted magnetic semiconductorCu2FeSnS4nanocrystals with a novel zincblende structure have been successfully synthesized by a hot-injection approach. Cu+, Fe2+, and Sn4+ions occupy the same position in the zincblende unit cell, and their occupancy possibilities are 1/2, 1/4, and 1/4, respectively. The nanocrystals were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), energy-dispersive spectroscopy (EDS), and UV-vis-NIR absorption spectroscopy. The nanocrystals have an average size of 7.5 nm and a band gap of 1.1 eV and show a weak ferromagnetic behavior at low temperature.

scholarly journals Effects of Temperature on the Microstructure and Magnetic Property of Cr-Doped ZnO DMS Prepared by Hydrothermal Route Assisted by Pulsed Magnetic Fields

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Shiwei Wang ◽  
Min Zhong ◽  
Cong Liu ◽  
Ying Li ◽  
Mingyuan Zhu ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Diluted Magnetic Semiconductor ◽  
Room Temperature Ferromagnetism ◽  
Magnetic Semiconductor ◽  
Pulsed Magnetic Fields ◽  
Hydrothermal Route ◽  
Doped Zno ◽  
Diluted Magnetic ◽  
Zno Crystal ◽  
Zn Ions

In the present work, Cr-doped ZnO diluted magnetic semiconductor was synthesized by hydrothermal method under pulsed magnetic fields. The samples were characterized by XRD, SEM, VSM, Raman, and XPS techniques. Results demonstrated that Zn ions in the ZnO crystal lattice were partially displaced by Chromium (III) ions. All samples show room temperature ferromagnetism which was enhanced by pulsed magnetic fields. The mechanism of ferromagnetism of Cr-doped ZnO particles was discussed.

Preparation of Bulk Polycrystalline MnGexSby (x = 0.5-1.0; y = 1.5-2.2) Doped with Co or Fe

2015 ◽  
Vol 760 ◽  
pp. 329-334
Author(s):  
Madalin Ion Rusu ◽  
Daniel Tenciu ◽  
Nicolae Catalin Zoita ◽  
Roger Notonier ◽  
Alain Tonetto ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Preparation Method ◽  
Diluted Magnetic Semiconductor ◽  
Bulk Material ◽  
Magnetic Semiconductor ◽  
X Ray Diffraction ◽  
X Ray ◽  
Diluted Magnetic ◽  
Scanning Electron

Bulk polycrystalline MnGexSby materials doped with Co or Fe were prepared and investigated with the aim of obtaining new diluted magnetic semiconductor (DMS) materials. An innovative preparation method was also established. Investigation techniques like X-ray diffraction (XRD), Raman scattering, and scanning electron microscopy (SEM) associated with energy dispersive X-ray analysis (EDX) have been employed to derive the structural properties and the composition of the bulk material.

scholarly journals X-Ray Photoelectron Spectroscopy and X-Ray Diffraction Studies of Zn1-xCoxS Diluted Magnetic Semiconductor Crystals

1993 ◽  
Vol 84 (4) ◽  
pp. 633-636 ◽  
Author(s):  
K. Ławniczak-Jabłońska ◽  
Z. Gołacki ◽  
W. Paszkowicz ◽  
R.J. Iwanowski ◽  
L.S. Johansson ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
X Ray Diffraction ◽  
X Ray ◽  
Semiconductor Crystals ◽  
Diluted Magnetic

Structural, Electrical and Magnetic Investigations of Conductive ZnO: Co Thin Films Deposited by DC Reactive Magnetron Co-Sputtering

2013 ◽  
Vol 543 ◽  
pp. 251-254 ◽  
Author(s):  
Soumia Lardjane ◽  
Mohammad Arab Pour Yazdi ◽  
Noureddine Fenineche ◽  
G. Merad ◽  
H.I. Feraoun ◽  
...  
Keyword(s):  
High Pressure ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Antiferromagnetic Interaction ◽  
Reactive Magnetron ◽  
X Ray Diffraction ◽  
Dc Magnetron Sputtering ◽  
X Ray ◽  
Diluted Magnetic ◽  
Free Spins

Zn1-xCoxO (0 < x < 14.6) diluted magnetic semiconductor coatings have been obtained by reactive DC magnetron sputtering of metallic Zn and Co targets at high pressure and high temperature. The coatings structural properties have been investigated by X-ray diffraction. All as-deposited coatings are crystalized in ZnO structure and neither traces of metallic nor oxide Co-rich clusters were detected in the films. The temperature dependence of the magnetization shows a paramagnetic Curie-Weiss behavior with antiferromagnetic interaction due to the associated spins and simple paramagnetic curie behavior of isolated free spins.

Preparation of Zn1-xCoxO Diluted Magnetic Semiconductor by Hydrothermal Method

2008 ◽  
Vol 368-372 ◽  
pp. 620-622 ◽  
Author(s):  
Hui Qin Li ◽  
Hong Yan Miao ◽  
Guo Qiang Tan
Keyword(s):  
Hydrothermal Method ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Nanocrystalline Powders ◽  
X Ray Diffraction ◽  
Uv Visible ◽  
Doped Zno ◽  
Diluted Magnetic ◽  
Zn Ions ◽  
Co Doped

Zn1-xCoxO diluted magnetic semiconductor was prepared by hydrothermal method at 200 °C and 240 °C for 24h with the Co2+ doping content of 5~15 mol%. NaOH was used as the mineralizer. X-ray diffraction analysis indicated that the as-prepared Co-doped ZnO had the pure ZnO wurtzite structure. UV–Visible spectroscopy had shown that the Co ions are substituted to Zn ions in ZnO matrix. Room temperature VSM revealed a paramagnetic behavior of the Co-doped ZnO samples. FE-SEM analyses showed that nanocrystalline powders of pure Zn095Co0.05O and Zn09Co0.1O could be prepared by the hydrothermal method.

Preparation and Characterization of Cobalt Doped ZnO and TiO2

2002 ◽  
Vol 722 ◽  
Author(s):  
Shaoguang Yang ◽  
Silas T. Hung ◽  
Herman H.Y. Sung ◽  
A.B. Pakhomov ◽  
C.Y. Wong
Keyword(s):  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Zno Films ◽  
X Ray Diffraction ◽  
Sputtering Deposition ◽  
X Ray ◽  
Doped Zno ◽  
Diluted Magnetic ◽  
Co Doped

AbstractSynthesis and characterization of transparent Co-doped ZnO and TiO2 diluted magnetic semiconductor (DMS) films are described. The films are prepared by single sputtering deposition. They are ferromagnetic at temperatures as high as 350 K. The films were characterized by X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS), X-ray fluorescence (XRF). Optical transparency was measured on UV/VIS spectrometer. The Codoped ZnO films had wurtzite structure similar to ZnO with the (002) preferential texture. Neither XRD nor XPS showed any presence of pure Co or CoO in the samples. The Co-doped TiO2 samples were amorphous, and some unoxidized Co was found in the films.

Structural and Optical Properties of Al Co-Doped ZnCoO Thin Film

2014 ◽  
Vol 989-994 ◽  
pp. 656-659
Author(s):  
Ping Cao ◽  
Yue Bai
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Structural And Optical Properties ◽  
Al Doping ◽  
X Ray ◽  
Uv Emission ◽  
Uv Absorption Spectroscopy ◽  
Co Doped

Al co-doped ZnCoO thin film has been prepared by a sol-gel method. The structural and optical properties of the sample were investigated. X-ray diffraction and UV absorption spectroscopy analyses indicate that Al3+ and Co2+ substitute for Zn2+ without changing the wurtzite structure. With the Al doping, the visible emission increased and the UV emission decreased, which is attributed to the increase of O vacancies and Zn interstitials.

The impact of hydrogenation conditions on the physical properties of the degenerated Ni/Al co-doped diluted magnetic semiconductor anatase nanoparticles

2021 ◽  
Vol 11 ◽  
Author(s):  
A. A. Dakhel
Keyword(s):  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Precipitation Method ◽  
Optical Absorption Spectroscopy ◽  
X Ray Diffraction ◽  
Ferromagnetic Properties ◽  
Anatase Nanoparticles ◽  
Diluted Magnetic ◽  
The Impact ◽  
Co Doped

: Anatase (TiO2) nanoparticles co-doped with Ni/Al ions were synthesized by a thermo-precipitation method. The samples were characterized by using X‐Ray diffraction and optical absorption spectroscopy. The structural/optical investigations established the development of substitutional solid solutions: TiO2:Ni:Al. The magnetization investigations were performed to study the generated stable ferromagnetic properties of the samples due to the Ni2+ doping. To boost the created ferromagnetic properties, Al ions co-dopings were employed to supply/densify the itinerant electrons. It was planned to decide the suitable hydrogenation conditions and temperature (TH), which are necessary to create appreciable strength of ferromagnetic properties in the host co-doped samples based on TiO2 for practical uses. The results established that the ferromagnetic energy (Umag) was increased by ~240% and the saturation magnetization by ~140% with increasing of TH from 400 oC to 500oC. The obtained Msat was higher by ~50 times than that previously attained for Ni-doped TiO2. Such novel results were discussed and explained through the spin-spin Heisenberg interactions.

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