Weak ferromagnetism in Mn2+ doped Bi2Te3 nanocrystals grown in glass matrix

Silva, R.S.; Gualdi, A. J.; Zabotto, F. L.; Cano, Nilo F.; Silva, A.C.A.; Dantas, Noélio O.

doi:10.1016/j.jallcom.2017.03.066

Cited by 10 publications

(5 citation statements)

References 27 publications

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“…Therefore, the long-range magnetic properties generated by the domain of the Cr ion doping spins, in addition to the insulating topological states of the Bi 2 Te 3 semiconductor NCs, have aroused great interest in the scientific community for the development of spintronic nanodevices [24,25,27,28].…”

Section: Figure 6(d)mentioning

confidence: 99%

“…Bi 2 Te 3 semiconductors at the nanoscale are highly performing materials for thermoelectric and promising applications as topological insulators [23]. These nanosemiconductors' physical and chemical properties can enhance and perform new features based on quantum behavior and the electronic structure's doping [24][25][26]. The synthesis of Bi 2 Te 3 NCs in diamagnetic host glasses allows the samples' high chemical stability.…”

Section: Introductionmentioning

confidence: 99%

“…The synthesis of Bi 2 Te 3 NCs in diamagnetic host glasses allows the samples' high chemical stability. During fusion, Cr ions can incorporate into these systems allowing possible applications in the manufacture of magneto-optical devices [25][26][27]. Therefore, the long-range magnetic properties generated by the domain of the Cr ion doping spins, in addition to the insulating topological states of the Bi 2 Te 3 semiconductor NCs, have aroused great interest in the scientific community for the development of spintronic nanodevices [24,27,28].…”

Section: Introductionmentioning

confidence: 99%

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Doped Semiconductor Nanocrystals: Development and Applications

Silva¹,

Alvin²,

Santos³

et al. 2021

Nanocrystals [Working Title]

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This chapter aims to show significant progress that our group has been developing and the applications of several doped semiconductor nanocrystals (NCs), as nanopowders or embedded in glass systems. Depending on the type of dopant incorporated in the nanocrystals, the physical, chemical, and biological properties can be intensified. However, it can also generate undesired toxic effects that can potentially compromise its use. Here we present the potential of zinc oxide NCs doped with silver (Ag), gold (Au), and magnesium (Mg) ions to control bacterial diseases in agriculture. We have also performed biocompatibility analysis of the pure and Ag-doped sodium titanate (Na2Ti3O7) NCs in Drosophila. The doped nanocrystals embedded in glassy systems are chrome (Cr) or copper (Cu) in ZnTe and Bi2Te3 NCs for spintronic development nanodevices. Therefore, we will show several advantages that doped nanocrystals may present in the technological and biotechnological areas.

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Section: Figure 6(d)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Doped Semiconductor Nanocrystals: Development and Applications

Silva¹,

Alvin²,

Santos³

et al. 2021

Nanocrystals [Working Title]

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“…These new properties acquired in diluted magnetic semiconductor nanostructures are attributed to exchange interactions between semiconductor sp bands and d levels introduced by TM ions. − Mn-doped semiconductor nanocrystals allow for the study of spin dynamics together with the effects of quantum confinement properties. The change of the optical and magnetic properties by varying the Mn concentration and size was reported for various types of nanocrystals, such as Bi 2– x Mn x S 3 , , Bi 2– x Mn x Te 3 , Cd 1– x Mn x S, Cd 1– x Mn x Se, Pb 1– x Mn x S, Pb 1– x Mn x Se, , and Zn 1– x Mn x O . DMS nanostructured materials can be utilized in a range of technological applications, such as in light-emitting diodes, , solar cell photovoltaics, photonic and magnetic devices, and fluorescent biomarkers. , …”

Section: Introductionmentioning

confidence: 99%

“…The change of the optical and magnetic properties by varying the Mn concentration and size was reported for various types of nanocrystals, such as Bi 2– x Mn x S 3 , , Bi 2– x Mn x Te 3 , Cd 1– x Mn x S, Cd 1– x Mn x Se, Pb 1– x Mn x S, Pb 1– x Mn x Se, , and Zn 1– x Mn x O . DMS nanostructured materials can be utilized in a range of technological applications, such as in light-emitting diodes, , solar cell photovoltaics, photonic and magnetic devices, and fluorescent biomarkers. , …”

Section: Introductionmentioning

confidence: 99%

Raman and EPR Characterization of Diluted Magnetic Semiconductor Sb_2–xMn_xS₃ Nanocrystals Grown in a Glass Matrix

et al. 2019

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Structural and magnetic property change for different Mn concentrations in diluted magnetic semiconductor Sb 2−x Mn x S 3 nanocrystals grown in a glass host matrix were investigated. Transmission electron microscopy images and energy dispersive X-ray analyses and Raman spectra with the modified model confirm the size and composition of nanocrystals. Electron paramagnetic resonance shows six hyperfine lines of the electron states, which are attributed to the interaction between the electron spin (S = 5/ 2) and the nuclear spin (I = 5/2) of Mn 2+ ions (3d 5 ) located in the crystal field of Sb 2 S 3 semiconductor. Also, a change in Mn−Mn interactions is observed as Mn concentration increases. The blueshift of the Raman band around 188 cm −1 with increasing Mn concentration gives strong indications of the substitution of Mn 2+ ions for Sb 3+ ions in the crystalline structure of Sb 2 S 3 . In addition, the band around 217 cm −1 remains constant for Mn concentrations of 0.00−0.10. However, for x = 0.20, a displacement of 210 cm −1 occurs, which indicates an interstitial incorporation of Mn ions in the Sb 2 S 3 structure at high Mn concentrations. A Raman high-frequency "shoulder" mode at 339 cm −1 is observed. Therefore, in this work, Sb 2−x Mn x S 3 nanocrystals were grown successfully.

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