Preparation and properties of CuCr2Se4 ferromagnetic spinel nanocrystals

Kim, D.; Rusnak, A. N.; Parameswaran, Shyam; Patra, Chitta Ranjan; Trofimov, V. B.; Harpness, R.; Gedanken, Aharon; Tver’yanovich, Yu. S.

doi:10.1134/s1087659606030138

Cited by 12 publications

(9 citation statements)

References 17 publications

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“…In relation to NCs, slightly different magnetic activities were reported, depending on the NC synthetic method which was employed. For example, magnetic measuremernts of CuCr 2 Se 4 NCs (synthesized from microwave radiation) showed a saturation magnetization of 15 emu g −1 and a coercive force of 80 Oe at room temperature. − In another report, agglomerated CuCr 2 Se 4 NCs (particle sizes between 25 and 200 nm) were formed in a solvothemal synthesis approach, in which a Curie temperature of 450 K presented saturation magnetization of 2.3 μ B per Cr atom at 5 K . Similar results were also reported by Rao et al A colloidal approach reported by Wang et al allowed for much better size control of the resultant CuCr 2 Se 4 NCs, in which hysteresis loops for NCs, with an average size of 15 and 25 nm, were measured at 300 and 10 K, respectively .…”

Section: Functional Propertiessupporting

confidence: 65%

Compound Copper Chalcogenide Nanocrystals

et al. 2017

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This review captures the synthesis, assembly, properties, and applications of copper chalcogenide NCs, which have achieved significant research interest in the last decade due to their compositional and structural versatility. The outstanding functional properties of these materials stems from the relationship between their band structure and defect concentration, including charge carrier concentration and electronic conductivity character, which consequently affects their optoelectronic, optical, and plasmonic properties. This, combined with several metastable crystal phases and stoichiometries and the low energy of formation of defects, makes the reproducible synthesis of these materials, with tunable parameters, remarkable. Further to this, the review captures the progress of the hierarchical assembly of these NCs, which bridges the link between their discrete and collective properties. Their ubiquitous application set has cross-cut energy conversion (photovoltaics, photocatalysis, thermoelectrics), energy storage (lithium-ion batteries, hydrogen generation), emissive materials (plasmonics, LEDs, biolabelling), sensors (electrochemical, biochemical), biomedical devices (magnetic resonance imaging, X-ray computer tomography), and medical therapies (photochemothermal therapies, immunotherapy, radiotherapy, and drug delivery). The confluence of advances in the synthesis, assembly, and application of these NCs in the past decade has the potential to significantly impact society, both economically and environmentally.

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Section: Functional Propertiessupporting

confidence: 65%

Compound Copper Chalcogenide Nanocrystals

et al. 2017

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“…Copper selenide nanoparticles are mostly found as CuSe, Cu 2 Se and Cu 3 Se 2 with their bulk materials possessing band gap energy between 1 and 2.3 eV [4,5]. Various results have been reported for the synthesis of Cu x MSe 4 (M = Sb [6,7], P [8], Sn [9], Cr [10,11], As [12]) nanoparticles. These methods resulted in various shaped and sized particles.…”

Section: Introductionmentioning

confidence: 99%

Investigation of optical and device parameters of colloidal copper tungsten selenide ternary nanosheets

Yıldırım

Sarılmaz

Özel

2017

J Mater Sci: Mater Electron

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“…Based on wet chemical colloidal synthesis technology, they have successfully obtained a series of phase-pure Cr-based chalcospinel nanocrystals, − which greatly contributed to the development of this material system. Meanwhile, some other synthesis techniques, including the microwave-assisted polyol method, − mechanical alloying, − thermal decomposition, solvothermal reactions, and sonochemical synthesis, have also been successfully applied to the preparation of Cr-based chalcospinels. In addition, ACr 2 X 4 thin films have also been fabricated by chemical deposition, physical deposition, and electrodeposition .…”

Section: Introductionmentioning

confidence: 99%

Novel Strategy toward Chromium-Based Thiospinel Multifunctional Magnetic Materials from Amorphous Chromites

Tang

et al. 2022

Crystal Growth & Design

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Magnetic nanomaterials have a broad range of promising applications in mechanical, electronic, optical, magnetic, chemical, and biological fields due to their excellent physicochemical properties, especially their unique magnetic properties. Chromium-based chalcospinels exhibit a variety of magnetic and electrical properties and attract widespread attention. Although the physical properties of Cr-based chalcospinels have been extensively studied, the fabrication of their micro/nanostructures has always been a challenge. In the present work, we develop a novel method for the preparation of Cr-based chalcospinels. The representative ferrimagnetic semiconductor CoCr 2 S 4 , ferromagnetic metal CuCr 2 S 4 , and ferromagnetic semiconductor CdCr 2 S 4 are successfully synthesized by direct sulfurization in a solvothermal system using amorphous metal chromites as the precursors. The phase structure, chemical composition, crystal morphology, optical absorption, and magnetic properties of the obtained samples are analyzed comprehensively. The experimental results demonstrate that the prepared CoCr 2 S 4 and CdCr 2 S 4 samples have direct band gaps of 1.71 and 2.49 eV, and their Curie temperatures are about 206 and 90 K, respectively, while the Curie temperature of the CuCr 2 S 4 sample is higher than room temperature. More importantly, the as-established synthesis methodology is expected to be further extended to other Cr-based chalcospinels, thus opening a new avenue for the potentially universal preparation of this material system.

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Preparation and properties of CuCr2Se4 ferromagnetic spinel nanocrystals

Cited by 12 publications

References 17 publications

Compound Copper Chalcogenide Nanocrystals

Compound Copper Chalcogenide Nanocrystals

Investigation of optical and device parameters of colloidal copper tungsten selenide ternary nanosheets

Novel Strategy toward Chromium-Based Thiospinel Multifunctional Magnetic Materials from Amorphous Chromites

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