Doping induced magnetism in Co–ZnS nanoparticles

Sambasivam, Sangaraju; Joseph, D. Paul; Lin, J. G.; Venkateswaran, C.

doi:10.1016/j.jssc.2009.07.015

Cited by 103 publications

(34 citation statements)

References 26 publications

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“…Among these materials ZnSe is important. The TM ion-doped ZnSe nanomaterials form a new class of luminescent materials [1][2][3][4][5][6][7][8]. Compared with other TM ions, for example Mn 2?…”

Section: Introductionmentioning

confidence: 99%

Doping-induced emission of infrared light from Co2+-doped ZnSe quantum dots

Zhang

Chen

et al. 2011

Res Chem Intermed

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ZnSe quantum dots doped with Co 2? have been prepared in aqueous solution by a one-pot method using thioglycolic acid as stabilizer. The quantum dots were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), UV-visible spectrophotometry, and spectrofluorimetry. The results confirmed the quantum dots formed a single cubic phase with zinc blende structure. The average particle size of the quantum dots was approximately 5 nm. Co 2? ions were doped into ZnSe lattice sites by substitution. As a result, infrared (IR) emission of Co 2? 4 T 2 (F) ? 4 A 2 (F) at approximately 3.5 lm was detected on excitation with 755 nm radiation.

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Section: Introductionmentioning

confidence: 99%

Doping-induced emission of infrared light from Co2+-doped ZnSe quantum dots

Zhang

Chen

et al. 2011

Res Chem Intermed

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“…Transition metal ion-doped ZnS nanoparticles are studied extensively to explore their structural, optical, luminescence and magnetic properties. 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].…”

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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“…Depending on the dopants and preparation methods, ZnS may show paramagnetic or ferromagnetic behavior. 10,[20][21][22][23][24][25] In Eu doped samples, the ferromagnetic behavior is attributed to the presence of Eu 2+ (S=7/2). Nevertheless, the origin of the ferromagnetic order in doped ZnS is still controversial and much has yet to be understood.…”

Section: Introductionmentioning

confidence: 99%

Controlled synthesis of Eu2+ and Eu3+ doped ZnS quantum dots and their photovoltaic and magnetic properties

et al. 2016

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Eu-doped ZnS quantum dots (QDs) have been synthesized by wet-chemical method and found to form in zinc blende (cubic) structure. Both Eu2+ and Eu3+ doped ZnS can be controllably synthesized. The Eu2+ doped ZnS QDs show broad photoluminescence emission peak around 512 nm, which is from the Eu2+ intra-ion transition of 4f6d1 – 4f7, while the Eu3+ doped samples exhibit narrow emission lines characteristic of transitions between the 4f levels. The investigation of the magnetic properties shows that the Eu3+ doped samples exhibit signs of ferromagnetism, on the other hand, Eu2+ doped samples are paramagnetic of Curie-Weiss type. The incident photon to electron conversion efficiency is increased with the Eu doping, which suggests the QD solar cell efficiency can be enhanced by Eu doping due to widened absorption windows. This is an attractive approach to utilize benign and environmentally friendly wide band gap ZnS QDs in solar cell technology.

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Doping induced magnetism in Co–ZnS nanoparticles

Cited by 103 publications

References 26 publications

Doping-induced emission of infrared light from Co2+-doped ZnSe quantum dots

Doping-induced emission of infrared light from Co2+-doped ZnSe quantum dots

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

Controlled synthesis of Eu2+ and Eu3+ doped ZnS quantum dots and their photovoltaic and magnetic properties

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