Room temperature ferromagnetism in Ni doped ZnS nanoparticles

Kumar, Sanjeev; Chen, C.L.; Dong, Chung‐Li; Ho, Y. K.; Lee, J.F.; Chan, Ting‐Shan; Thangavel, R.; Chen, Ta-Kun; Mok, B. H.; Rao, Shanta S.; Wu, Mow-Kuen

doi:10.1016/j.jallcom.2012.12.001

Cited by 98 publications

(24 citation statements)

References 42 publications

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“…When the doping concentration is low, the small magnetic dipoles existing on the surface of the nanorods interact with their nearest neighbors inside the particles, producing exchange energy that forces the other neighboring dipoles to be aligned in the same direction. Due to the high specific surface area of nanorods, the number of magnetic dipoles of the same orientation will be enhanced in the same direction [34,35]. At the same time, the ferromagnetic coupling plays a dominant role in the ferromagnetic contribution to the sample.…”

Section: Magnetic Properties the Magnetic Behavior Of Ni Dopedmentioning

confidence: 99%

Optical and Magnetic Properties of Ni Doped ZnS Diluted Magnetic Semiconductors Synthesized by Hydrothermal Method

Wei

Zhao

et al. 2017

Journal of Nanomaterials

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Diluted magnetic semiconductors Zn 1− Ni S with different consistency ratio ( = 0, 0.01, 0.03, 0.05, and 0.07) were successfully synthesized by hydrothermal method using ethylenediamine as a modifier. The influence of Ni doping concentration on the microstructure, morphology, and optical and magnetic properties of undoped and Ni doped ZnS nanocrystals was characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray energy dispersive spectrometry (XEDS), ultraviolet-visible spectroscopy (UV-vis), Fourier transform infrared spectroscopy (FT-IR), photoluminescence spectra (PL), and the vibrating sample magnetometer (VSM), respectively. The experiment results show the substitution of Ni 2+ on Zn 2+ sites without changing the hexagonal wurtzite structure of ZnS and generate single-phase Zn 1− Ni S with good crystallization. The lattice constant causes distortion and decreases with the increase of Ni 2+ doped concentration. The appearance of the samples is one-dimensional well-dispersed nanorods. UV-vis spectra reveal the band gap of all Zn 1− Ni S samples greater than that of bulk ZnS (3.67 eV), and blue shift phenomenon occurs. The photoluminescence spectra of undoped and doped samples possess the broad blue emission band in the range of 400-650 nm; the PL intensities of Zn 1− Ni S nanorods increase with the increase of Ni content comparing to pure ZnS and reach maximum for = 0.03. Magnetic measurements indicated that the undoped ZnS samples are superparamagnetic, whereas the doped samples exhibit ferromagnetism.

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Section: Magnetic Properties the Magnetic Behavior Of Ni Dopedmentioning

confidence: 99%

Optical and Magnetic Properties of Ni Doped ZnS Diluted Magnetic Semiconductors Synthesized by Hydrothermal Method

Wei

Zhao

et al. 2017

Journal of Nanomaterials

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“…ZnS is a II-VI intrinsic semiconductor with excellent chemical and physical properties like wide band-gap energy of 3.7 eV at room temperature, high optical transmittances in the visible region, large Bohr exciton radius (2.5 nm) and large exciton binding energy (40 meV) [1,2]. Due to its versatility the ZnS has become a promising material for many areas of research including light emitting diode (LED), solar cell, active sensor as well as wastewater treatment, electro-luminescent displays, antireflection coating for infrared devices and other nonlinear optical devices among others [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

First principles calculations and experimental study of the optical properties of Ni-doped ZnS

Rodríguez

Zandalazini

Navarro

et al. 2019

Mater. Res. Express

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Zinc sulphide doped with nickel (Ni:ZnS) has many applications in different fields like materials science, electronics, optics, and other industrial applications. Experimentally, a large variety of methods have been developed for Ni:ZnS synthesizing, where the chemical synthesis with capping agent is most successful, but has disadvantages like purity and the low performance. In addition, since there is not also much theoretical information about its features, the electronic and optical response of Ni:ZnS were studied, both experimentally by x-ray diffractometry (XRD), transmission electron microscopy (HR-TEM), and x-ray photoelectron spectroscopy (XPS) and theoretically by means of the density functional theory (DFT) calculations, giving an unified understanding of the electrooptical performance of this compound. In the same way, the importance of the inclusion of Ni impurities in the structure was studied and analyzed by the inclusion of a Hubbard potential in the calculations. We found that the optimal U value for Ni atoms is 4 eV in agreement with experimental results obtained by XPS. The dielectric function (ε 2 ) for pure and doped systems showed that the influence of the Ni atom is mainly given in the range of low energy regions (E<6 eV), where the new peaks are associated to transitions that include the impurity band states.

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“…The literature shows that many authors have reported the transition metal ion (Mn, Co, Ni, and Fe)-doped ZnS nanoparticles with different techniques [5][6][7][8][9][10][11][12]. ZnS exists in cubic and hexagonal structure with wide bandgap of 3.54 and 3.91 eV, respectively, and therefore becomes the potential candidate among II-VI group to tailor its properties [13][14][15]. One typical example is Mn-doped ZnS nanoparticles which show the orange emission [16,17].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ag on structural, optical and luminescence properties of ZnS nanoparticles synthesized by microwave-assisted chemical route

2017

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Silver (Ag)-doped (0, 5, 10 and 15%) ZnS nanoparticles are synthesized by microwave-assisted chemical route using polyvinylpyrrolidone (PVP). We study the compositional, structural, optical and luminescence properties by energy-dispersive analysis of X-rays (EDAX), transmission electron microscopy (TEM), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), UV-Vis spectroscopy and photoluminescence (PL) spectroscopy, respectively. Synthesized Ag-doped ZnS nanoparticles do not possess any impurity as seen from EDAX spectra. TEM images show particles to be in spherical shape with agglomeration, and corresponding selected area electron diffraction (SAED) pattern showed that they are polycrystalline in nature. Allowed LO and TO modes corresponding to cubic phase for all the samples are observed in Raman spectra. FTIR spectroscopy is used to study the interaction between PVP and as-synthesized nanoparticles. Blue shift can be seen in pure and Ag-doped ZnS nanoparticles compared to bulk ZnS as seen from absorption spectra. Green emission is observed in PL spectra due to Ag doping without showing any quenching behavior.

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Room temperature ferromagnetism in Ni doped ZnS nanoparticles

Cited by 98 publications

References 42 publications

Optical and Magnetic Properties of Ni Doped ZnS Diluted Magnetic Semiconductors Synthesized by Hydrothermal Method

Optical and Magnetic Properties of Ni Doped ZnS Diluted Magnetic Semiconductors Synthesized by Hydrothermal Method

First principles calculations and experimental study of the optical properties of Ni-doped ZnS

Effect of Ag on structural, optical and luminescence properties of ZnS nanoparticles synthesized by microwave-assisted chemical route

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