Magnetic and dielectric study of Fe-doped CdSe nanoparticles

Das, S.; Banerjee, Sourish; Bandyopadhyay, S.; Sinha, T.P.

doi:10.1007/s13391-017-6265-8

Cited by 6 publications

(2 citation statements)

References 26 publications

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“…Cadmium chalcogenide nanocrystals and quantum dots (QDs) such as CdS and CdSe have gained significant research interest during the past few decades due to their unique optical, mechanical, magnetic, and catalytic properties. − These QD systems represent some of the most widely studied and understood QDs in the literature, which is why they are chosen as a host for fundamental doping studies on QDs. The direct measurement of the evolution and decay of the excited states in these systems has helped to better understand the underlying fundamental physical processes of carrier dynamics in semiconductors , (e.g., different types of recombination and trapping).…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependent Carrier Dynamics in Ga-Alloyed CdSe/ZnS Core–Shell Quantum Dots

Sárosi,

Tuinenga,

Samu

et al. 2024

J. Phys. Chem. C

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In this work, temperature dependent transient absorption spectroscopy measurements are presented on galliumalloyed CdSe/ZnS core−shell nanoparticles between 30 and 130 °C. To our knowledge, temperature dependent measurements in these systems have been reported only in a few papers, although all processes related to carrier recombination are affected by temperature. For these experiments, gallium-alloyed CdSe/ZnS QD samples were used with nominal doping percentages of 2.5%, 7.5%, 15%. The experimental results show that the transient absorption decay is faster for the pristine CdSe/ZnS samples than in the gallium-alloyed samples at all temperatures. It is assumed that Ga-alloying promotes the formation of trions in the samples by introducing occupied impurity levels within the bandgap of CdSe. The resulting Coulomb blockade will, in turn, prolong the hot-electron relaxation process. By variation of the temperature, the distribution of charge carriers in the different recombination channels can be altered to accelerate recombination in the Ga-alloyed samples at higher temperatures. These measurements demonstrated their usefulness for observing the redistribution of charge carriers among different relaxation pathways.

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Section: Introductionmentioning

confidence: 99%

Temperature Dependent Carrier Dynamics in Ga-Alloyed CdSe/ZnS Core–Shell Quantum Dots

Sárosi,

Tuinenga,

Samu

et al. 2024

J. Phys. Chem. C

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“…As reported in recent literature, magnetism can be induced via chemical doping of transition metal ions in minute quantities in otherwise diamagnetic CdSe [6][7][8][9][10]. However, the key challenges while doping CdSe with transition metal ions is to control their concentration, distribution, and oxidation state since all these parameters affect the structural, optical, magnetic, and electronic properties of the diluted magnetic semiconductors so formed.…”

Section: Introductionmentioning

confidence: 99%

Inducing ferromagnetism in surface stabilised intrinsic CdSe nanoparticles by a simple process

Pokhriyal

Biswas

2020

Materials Science and Technology

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In this letter, we report a simple process to derive in situ surface stabilised intrinsic CdSe nanoparticles (NPs) showing room temperature ferromagnetism (RTFM). The observed RTFM is primarily attributed to the lattice strain ( ε) in the NPs supported by an effective core (CdSe)-shell (surface layer) charge transfer mechanism. The synthesis method allows precise control over particle morphology and dispersity, and is highly convenient in tuning the magnetic properties for pertinent applications. Highlights Magnetic CdSe nanoparticles were synthesized by a facile process. In situ formed graphitic-carbon layer on the surface stabilises the nanoparticles. The process permits precise control over particle morphology and dispersity. The technique is also convenient in tuning the magnetic properties. Monodispersed magnetic CdSe nanoparticles have potential applications in modern optoelectronics. GRAPHICAL ABSTRACT

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Effects of structural parameters on the optical and magnetic properties of surface stabilized intrinsic CdSe nanoparticles

Pokhriyal

Biswas

2020

Applied Surface Science

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Magnetic and dielectric study of Fe-doped CdSe nanoparticles

Cited by 6 publications

References 26 publications

Temperature Dependent Carrier Dynamics in Ga-Alloyed CdSe/ZnS Core–Shell Quantum Dots

Temperature Dependent Carrier Dynamics in Ga-Alloyed CdSe/ZnS Core–Shell Quantum Dots

Inducing ferromagnetism in surface stabilised intrinsic CdSe nanoparticles by a simple process

Effects of structural parameters on the optical and magnetic properties of surface stabilized intrinsic CdSe nanoparticles

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