Room temperature magnetism of Fe doped CdS nanocrystals

Murali, G.; Reddy, D. Amaranatha; Poornaprakash, B.; Vijayalakshmi, R.P.; Reddy, B.K.; Venugopal, R.

doi:10.1016/j.physb.2012.02.011

Cited by 45 publications

(13 citation statements)

References 37 publications

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“…The magnetic moment per ion was then calculated. The structural uniformity correlates with superior magnetic property from these materials, which is at least an order of magnitude higher than previously reported systems. ,, …”

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confidence: 60%

“…In fact, several studies in bulk, thin films, and nanowires have shown the importance of uniform magnetic ion distribution. − Though similar studies in QDs are unavailable, statistical analysis of doping with nonuniform distribution of magnetic ions shows that the cluster formation of magnetic elements on the surface or inside the semiconductor nanocrystals results in poor magnetic response from these QDs. In fact, few reports on QDs which claim to show DMS property have not shown any clear evidence of dopant distribution inside the QDs. , Instead, the low magnetic response from these materials supports the fact of secondary phase formation …”

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confidence: 99%

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Uniform Doping in Quantum-Dots-Based Dilute Magnetic Semiconductor

Saha¹,

Shetty²,

Pavan³

et al. 2016

J. Phys. Chem. Lett.

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Effective manipulation of magnetic spin within a semiconductor leading to a search for ferromagnets with semiconducting properties has evolved into an important field of dilute magnetic semiconductors (DMS). Although a lot of research is focused on understanding the still controversial origin of magnetism, efforts are also underway to develop new materials with higher magnetic temperatures for spintronics applications. However, so far, efforts toward quantum-dots(QDs)-based DMS materials are plagued with problems of phase separation, leading to nonuniform distribution of dopant ions. In this work, we have developed a strategy to synthesize highly crystalline, single-domain DMS system starting from a small magnetic core and allowing it to diffuse uniformly inside a thick CdS semiconductor matrix and achieve DMS QDs. X-ray absorption fine structure (XAFS) spectroscopy and energy-dispersive X-ray spectroscopy-scanning transmission electron microscopy (STEM-EDX) indicates the homogeneous distribution of magnetic impurities inside the semiconductor QDs leading to superior magnetic property. Further, the versatility of this technique was demonstrated by obtaining ultra large particles (∼60 nm) with uniform doping concentration as well as demonstrating the high quality magnetic response.

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confidence: 60%

mentioning

confidence: 99%

Uniform Doping in Quantum-Dots-Based Dilute Magnetic Semiconductor

Saha¹,

Shetty²,

Pavan³

et al. 2016

J. Phys. Chem. Lett.

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“…The reason for increase in the ferromagnetic behavior is the formation of bound magnetic polarons originating because of the charge imbalance between the ions of Fe and Cd. Further, the formation of bound magnetic polarons enhances the saturation magnetization [19,35,36]. …”

Section: Magnetic Analysis: Vsmmentioning

confidence: 99%

“…Metals such as Tb [12], Mn [13], Te [14], Cu [15], Ni [16], Gd [17], and Cr [18] doped into CdS contributed very encouraging results upon doping. Although there are various reports on the synthesis and characterization of Fe-doped CdS nanocrystals [19,20], quantum dots [21], nanopowder [22], and nanoparticles [23], they lack comprehensive coverage on optical and magnetic studies. Further, it is inferred that CdS nanoparticles doped with Fe will be a promising dilute magnetic semiconductor in the area of spintronics.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermally Synthesized CdS Nanoparticles: Effect of Fe Doping on Optical and Magnetic Properties

Kaur

Verma

2015

J Supercond Nov Magn

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Fe-doped CdS nanoparticles (Cd 1−x Fe x S) (x = 0.0, 0.03, 0.05, 0.10) were synthesized using hydrothermal technique. X-ray diffraction (XRD) confirmed hexagonal structure of the nanoparticles with sizes 39.9, 22.8, 13.3, and 11.4 nm, respectively, for undoped 3 %, 5 % and 10 % Fedoped CdS nanoparticles. No extra peaks were found in energy-dispersive spectroscopy (EDS) showing absence of any impurity. Transmission electron microscopy (TEM) confirmed uniform spherical morphology of synthesized nanoparticles. The UV-visible absorption spectra confirmed a blue shift in the case of Fe-doped CdS nanoparticles. Photoluminescence (PL) technique revealed the occurrence of green emission in the CdS nanoparticles. A vibrating sample magnetometer (VSM) provided the hysteresis curves with magnetic saturation values of 0.015, 0.027, 0.048, and 0.071 emu/g for undoped, 3 %, 5 %, and 10 % Fe-doped CdS nanoparticles, respectively.

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“…Blue shift has been observed in Ag doped CdS/PVA nanocomposites. Mn, Cu, Cr, Co and Eu have been used to enhance the photoluminescence properties [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Influence of Al doping on optical properties of CdS/PVA nanocomposites: Theory and experiment

Bala¹,

Tripathi²,

Kumar³

2014

AIP Conference Proceedings

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In the present work theoretical and experimental studies of aluminium doped cadmium sulphide polyvinyl alcohol (Al:CdS/PVA) nanocomposites have been carried out. Tetrahedral cluster AlCd 9 S 2 (SH) 18 ] 1-has been encapsulated by small segments of polyvinyl alcohol (PVA) chains in order to simulate experimental environment of nanocomposites. Density functional theory (DFT) using local density approximation (LDA) functionals is employed to study the broadening of band gap upon ligation of nanoclusters. We have used in situ chemical route to synthesize nanocomposites. Optical band gap has been calculated from both experimental and theoretical approach.

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Room temperature magnetism of Fe doped CdS nanocrystals

Cited by 45 publications

References 37 publications

Uniform Doping in Quantum-Dots-Based Dilute Magnetic Semiconductor

Uniform Doping in Quantum-Dots-Based Dilute Magnetic Semiconductor

Hydrothermally Synthesized CdS Nanoparticles: Effect of Fe Doping on Optical and Magnetic Properties

Influence of Al doping on optical properties of CdS/PVA nanocomposites: Theory and experiment

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