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.

Synthesis and Characterization of Cu2FeSnS4 Semiconductor Nanocrystals with Zincblende Structure

2012 ◽  
Vol 512-515 ◽  
pp. 2019-2022 ◽  
Author(s):  
Xiao Lu Liang ◽  
Xian Hua Wei
Keyword(s):  
Random Distribution ◽  
Semiconductor Nanocrystals ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Nir Absorption ◽  
Average Size

Cu2FeSnS4semiconductor nanocrystals with zincblende structure have been successfully synthesized by a hot-injection approach. Cu+, Fe2+, and Sn4+cations have a random distribution in the zincblende unit cell, and the occupancy possibilities are 1/2, 1/4 and 1/4, respectively. Those 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 Cu2FeSnS4 nanocrystals have an average size of 7.5 nm and a band gap of 0.92 eV.

scholarly journals Effect of doping and sintering in structure and magnetic properties of the diluted magnetic semiconductor ZnO:Ni

Cerâmica ◽  
2018 ◽  
Vol 64 (372) ◽  
pp. 627-631
Author(s):  
A. Morais ◽  
R. A. Torquato ◽  
U. C. Silva ◽  
C. Salvador ◽  
C. Chesman
Keyword(s):  
Magnetic Properties ◽  
Band Gap ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Ferromagnetic Behavior ◽  
Second Phase ◽  
X Ray Diffraction ◽  
Diluted Magnetic ◽  
Zno Semiconductor ◽  
Effect Of Doping

Abstract This work aimed to study a sintered Ni-doped ZnO dilute magnetic semiconductor synthesized by means of a combustion reaction and to evaluate the effect of doping and sintering in the band gap and magnetic properties of the material. X-ray diffraction showed the formation of the ZnO semiconductor phase and also the formation of a second-phase characterized as a solid solution of nickel-zinc oxide. The hysteresis curves showed the success in creating ferromagnetism with doping and the effect of sintering in the remanent magnetization and coercive field values, yet both systems were able to maintain its ferromagnetic behavior. The UV-vis analysis indicated the value of the band gap continued as a semiconductor material, although it has been narrowed. Scanning electron microscopy was used in a complementary way to evaluate the morphology and its effects on magnetic properties.

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

Synthesis and characterization of 3D Cu0.45Mn0.55O2 nanoflowers with novel photoluminescence and magnetic properties

2014 ◽  
Vol 28 (09) ◽  
pp. 1450071
Author(s):  
Arbab Mohammad Toufiq ◽  
Fengping Wang ◽  
Qurat-ul-ain Javed ◽  
Quanshui Li ◽  
Yan Li
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Three Dimensional ◽  
Ferromagnetic Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Growth Method ◽  
First Time

In this paper, three-dimensional (3D) Cu 0.45 Mn 0.55 O 2 nanoflowers self-assembled by interconnecting dense stacked single-crystalline nanoplates have been prepared using the template-free hydrothermal growth method. The morphology, phase structure and composition of the as-prepared nanomaterial were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) with selected area electron diffraction (SAED) and energy-dispersive X-ray spectroscopy (EDX). FESEM and TEM analyses show that the size of 3D Cu 0.45 Mn 0.55 O 2 nanoflowers is in the range of 1–1.5 μm and the thickness of interconnected nanoplates is about 40 nm on the average. The photoluminescence (PL) spectra of the as-prepared Cu 0.45 Mn 0.55 O 2 nanostructures at room temperature exhibits prominent emission bands located in red–violet spectral region. Moreover, magnetic investigations revealed the weak ferromagnetic behavior of the as-prepared Cu 0.45 Mn 0.55 O 2 nanoflowers and reported for the first time using vibrating sample magnetometer (VSM).

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.

Laser Plasma Induced Cu2O Nanoparticle Synthesis in Ethanol and Nanofluid Particle Characterization

2019 ◽  
Vol 8 (8) ◽  
pp. 1676-1682
Author(s):  
Magesh T. Rajan ◽  
Rizbi Hassan ◽  
Haiping Hong
Keyword(s):  
Laser Energy ◽  
Nanoparticle Synthesis ◽  
Colloidal Suspensions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Irregular Shapes ◽  
Transmission Electron ◽  
Average Size ◽  
Surface Morphologies

Nanofluids with nanoscale colloidal suspensions having condensed nanomaterials have been found to show highly-enhanced physical, chemical, thermal and transport properties and signifies great potential in many fields. In this article, laser induced plasmas at liquid-metal phase boundaries is investigated for copper oxide (Cu2O) nanoparticle synthesis in ethanol without any surfactants. The nanoparticles are generated using 1064 nm NdYAG laser ablation in a water confined plasma with 1.5 J laser energy pulsed at 10 Hz for 4 minutes, which resulted in narrow size distribution of nanoparticles of size ranging from 2 to 12 nm dispersed in ethanol sans surfactant. The synthesized Cu2O nanoparticles in ethanol are characterized for their sizes, surface morphology, crystalline structures and elemental compositions etc. The dynamic light scattering (DLS) measurements show Cu2O nanoparticles synthesized have an average size of 4.5 nm. The scanning electron microscope (SEM) measurements show Cu2O nanoparticles exhibit isolated and agglomerated nanoparticles with near-spherical and irregular surface morphologies. Transmission electron microscopy (TEM) measurements show Cu2O nanoparticles with near-spherical and irregular shapes, and the average size of the nanoparticles is ˜4.5 nm. Selected area electron diffraction (SAED) measurements show poly crystalline structure present in the Cu2O nanoparticles. The energy-dispersive X-ray spectroscopy (EDX) measurements show the purity of Cu2O nanoparticles with identification of significant Cu and O elements. X-ray diffraction (XRD) measurements confirm that the Cu2O nanoparticles are polycrystalline in nature and confirmed the presence of single phase of Cu2O nanoparticles.

Solid State Synthesis and Characterization of NiTe Nanocrystals

2014 ◽  
Vol 29 ◽  
pp. 35-39 ◽  
Author(s):  
C.E.M. Campos
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Solid State ◽  
Processing Time ◽  
Ferromagnetic Behavior ◽  
X Ray Diffraction ◽  
Selected Area Electron Diffraction ◽  
Nickel Powders ◽  
Transmission Electron ◽  
Average Size

NiTe nanocrystals were prepared through facile and fast solid state reaction (mechanical alloying) of pure elemental tellurium and nickel powders in an argon atmosphere. The samples processed for 3 h, 5 h and 10 h were characterized by X-ray diffraction, transmission electron microscopy, magnetization and Raman spectroscopy. Hexagonal NiTe crystals with an average size of 30 nm can be obtained after only 3 h of processing time. Transmission electron microscopy images showed a broad crystalline size distribution in the agglomerated particles and selected area electron diffraction revealed its crystalline character. NiTe ferromagnetic behavior was confirmed and magnetic parameters were dependent on processing time. Raman spectra showed no unreacted Te or tellurium oxides, but it also showed that laser induced phases transitions (including Te re-crystallization) can be observed for modest laser power (<3 mW).

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.

Controlled Synthesis of Hierarchical Flower-Like CuS Spheres by a Facile Microwave Hydrothermal Method

2012 ◽  
Vol 512-515 ◽  
pp. 265-268 ◽  
Author(s):  
Hui Qi ◽  
Jian Feng Huang ◽  
Li Yun Cao ◽  
Jian Peng Wu
Keyword(s):  
Electron Microscopy ◽  
Cetyltrimethylammonium Bromide ◽  
Controlled Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Hydrothermal ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Average Size ◽  
20 Nm

–Hierarchical flower–like CuS spheres have been synthesized by a facile microwave hydrothermal (MH) method using cetyltrimethylammonium bromide (CTAB) as the surfactant. The as–prepared CuS crystallites under different CTAB contents were characterized by X–ray diffraction (XRD), field–emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and selected area electron diffraction (SAED). Results show that the CTAB–assisted CuS particles have hierarchical flower–like microstructures that were assembled by thin nanoflakes with thickness of 10~20 nm. The corresponding HRTEM images reveal that these nanoflakes are composed of many nanoparticles with average size of about 7 nm. Moreover, when increasing the CTAB contents from 0 g⁄mL to 0.02 g⁄mL, the as–prepared CuS particles were found to have better dispersion stability with decreased average sizes of the hierarchical flower–like spheres. Comparing with the bulk CuS particles, the related UV–vis absorption spectrum of the as–prepared crystallites exhibits an obvious red shift with the absorption peak at 739 nm.

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