Synthesis Process Controlled of Semimagnetic Bi2–xMnxS3 Nanocrystals in a Host Glass Matrix

Silva, Ricardo Souza da; Silva, J. T. T.; Rocha, V. R.; Cano, Nilo F.; Silva, A. C. A.; Dantas, Noélio O.

doi:10.1021/jp5046657

Cited by 25 publications

(12 citation statements)

References 25 publications

(35 reference statements)

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“…Diluted magnetic semiconductors (DMS) embedded in a glassy matrix, such as: Bi 2-x Mn x S3 [32], Bi 2-x Fe x S 3 , [33] Bi 2-x Co x S 3 [34] and Bi 2-x Cr x S 3 , [35] have potential properties for the production of photovoltaic cells [36,37] thermoelectric cooling, [38,39] photodetectors, [40] field emission electronics [41] and fluorescent markers [42].…”

Section: Chrome-doped Bi 2 S 3 Nanocrystals Embedded In Host Glass Matrixmentioning

confidence: 99%

Transition Metals Doped Nanocrystals: Synthesis, Characterization, and Applications

Silva¹,

Oliveira²,

Floresta³

et al. 2021

Transition Metal Compounds - Synthesis, Properties, and Application

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Doping is a technique that makes it possible to incorporate substitutional ions into the crystalline structure of materials, generating exciting properties. This book chapter will comment on the transition metals (TM) doped nanocrystals (NCs) and how doping and concentration influence applications and biocompatibility. In the NCs doped with TM, there is a strong interaction of sp-d exchange between the NCs’ charge carriers and the unpaired electrons of the MT, generating new and exciting properties. These doped NCs can be nanopowders or be embedded in glass matrices, depending on the application of interest. Therefore, we show the group results of synthesis, characterization, and applications of iron or copper-doped ZnO nanopowders and chromium-doped Bi2S3, nickel-doped ZnTe, and manganese-doped CdTe quantum dots in the glass matrices.

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Section: Chrome-doped Bi 2 S 3 Nanocrystals Embedded In Host Glass Matrixmentioning

confidence: 99%

Transition Metals Doped Nanocrystals: Synthesis, Characterization, and Applications

Silva¹,

Oliveira²,

Floresta³

et al. 2021

Transition Metal Compounds - Synthesis, Properties, and Application

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“…Bi 2 S 3 semiconductor nanocrystals (NCs) present radioactive recombination of electron-hole carriers adjustable according to the temperature, time, and concentration of doping ions in the system [15,[35][36][37]. The occupation of vacancies in the Bi 2 S 3 orthorhombic network by Co 2+ ions (0.72 A)  replacing Bi 3+ ions (1.03 A)  can reduce intrinsic point defects and consequently increase the efficiency of semiconductor nanocrystals, for applications in solar cells [38], photocatalytic devices of visible light [39], thermoelectric [40] and spintronic [41].…”

Section: Effects Of Symmetry and Concentration Of Cobalt-doped Bi 2 S 3 Nanocrystals Embedded In Host Glass Matrixmentioning

confidence: 99%

Diluted Magnetic Semiconductors Nanocrystals: Saturation and Modulation

Silva¹,

Barbosa²,

Silva³

et al. 2021

Nanocrystals [Working Title]

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Diluted Magnetic Semiconductor (DMS) nanocrystals are a new class of materials formed by doping the semiconductor with transition metals (TM), which gives interesting magneto-optical properties. These properties are attributed to the exchange interaction between the pure semiconductor’s sp-electrons and the localized TM d-electrons. This book chapter shows exciting results of new DMS developed by the group, both in powder form and embedded in glassy systems. Depending on the concentration of doping ions, saturation of the incorporation of substitutional and interstitial sites in the nanocrystal structure may occur, forming other nanocrystals. In this context, we investigated the doping saturation limit in nanopowders of DMS Zn1-xMnxO NCs and Zn1-xMnxTe, Zn0.99-xMn0.01CoxTe, and Bi2-xCoxS NCs synthesized in glassy matrices. Thus, the sites’ saturation into the crystalline lattice of nanocrystals is a topic little reported in the literature, and we will comment on this work. Therefore, we will show results from the group about the modulation and saturation in diluted magnetic semiconductors nanocrystals in this work.

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“…[ 18 ] In this scenario, the fusion‐nucleation synthesis methodology is suitable for the formation of DMS NC having a glass matrix as a host, in which they show good thermal stability [ 19 ] and corrosion resistance. [ 20 ] As an example, the DMS NC is grown in a glass matrix that has optical and magnetic properties dependent on the concentration of transition metals, such as Bi 2 − x Mn x S 3 , [ 21 ] Bi 2 − x Co x S 3 , [ 22 ] Bi 2 − x Fe x S 3 , [ 23 ] Bi 2 − x Mn x Te 3 , [ 24 ] Bi 2 − x Cr x Te 3 , [ 25 ] Cd 1 − x Mn x S, [ 26 ] Pb 1 − x Mn x S, [ 27 ] Pb 1 − x Co x Se, [ 28 ] and Sb 2 − x Mn x S 3 . [ 29 ]…”

Section: Introductionmentioning

confidence: 99%

Study of vibrational properties of Bi_2 − xMn_xTe₃ nanocrystals in host glass: Effect of xMn‐concentration

Silva

Guimarães

Cano

et al. 2021

J Raman Spectroscopy

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The Raman and infrared (IR) active lattice vibrations of xMn‐concentration Bi2 − xMnxTe3 nanocrystals (NCs) as a dopant in semiconductor Bi2Te3 nanocrystals grown in a host glass matrix, whose symmetries correspond to the Rtrue3¯m−D3d5 space group, are investigated by Raman scattering. Transmission electron microscopy images confirm the formation of Bi2 − xMnxTe3 nanocrystals with an average size of around 5.4 nm. The observation of the six hyperfine structure lines in electron paramagnetic resonance spectra confirms the incorporation of Mn2+ ions in Bi2Te3 nanocrystals. The vibrational modes of quintuple layer (QL) of the diluted magnetic semiconductor Bi2 − xMnxTe3 nanocrystals are modified in relation to pure Bi2Te3 nanocrystals. The appearance of the A2u1 (95.5 cm−1), A2u2 (114 cm−1), and Eu2 (103 cm−1) IR‐active modes is mainly due to quantum size effects. Indeed, the redshifts of the A2u1 (95.5 cm−1), 0.25emEu2 (103 cm−1), Eg2 (110 cm−1), A2u2 (114 cm−1), and A1g2 (141 cm−1) vibrational modes give strong indications of the substitutional and interstitial incorporation of Mn2+ in the Bi2Te3 crystalline structure. In addition, the Raman spectra show the formation of Bi2OTe2 semiconductor due to the appearance of the (123 cm−1) mode. The investigation of the Bi2 − xMnxTe3 nanocrystal has promising potential to design new devices with magnetic and optical properties adjusted according to the xMn‐concentration.

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Synthesis Process Controlled of Semimagnetic Bi_2–xMn_xS₃ Nanocrystals in a Host Glass Matrix

Cited by 25 publications

References 25 publications

Transition Metals Doped Nanocrystals: Synthesis, Characterization, and Applications

Transition Metals Doped Nanocrystals: Synthesis, Characterization, and Applications

Diluted Magnetic Semiconductors Nanocrystals: Saturation and Modulation

Study of vibrational properties of Bi_2 − xMn_xTe₃ nanocrystals in host glass: Effect of xMn‐concentration

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Synthesis Process Controlled of Semimagnetic Bi2–xMnxS3 Nanocrystals in a Host Glass Matrix

Cited by 25 publications

References 25 publications

Transition Metals Doped Nanocrystals: Synthesis, Characterization, and Applications

Transition Metals Doped Nanocrystals: Synthesis, Characterization, and Applications

Diluted Magnetic Semiconductors Nanocrystals: Saturation and Modulation

Study of vibrational properties of Bi2 − xMnxTe3 nanocrystals in host glass: Effect of xMn‐concentration

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Product

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Synthesis Process Controlled of Semimagnetic Bi_2–xMn_xS₃ Nanocrystals in a Host Glass Matrix

Study of vibrational properties of Bi_2 − xMn_xTe₃ nanocrystals in host glass: Effect of xMn‐concentration