Large‐Size 2D β‐Cu<sub>2</sub>S Nanosheets with Giant Phase Transition Temperature Lowering (120 K) Synthesized by a Novel Method of Super‐Cooling Chemical‐Vapor‐Deposition

Li, Bo; Huang, Le; Zhao, Guangyao; Wei, Zhongming; Dong, Huanli; Hu, Wenping; Wang, Lin‐Wang; Li, Jingbo

doi:10.1002/adma.201602701

Cited by 67 publications

(55 citation statements)

References 54 publications

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“…Two turning points in the σ curve were observed for the HS-bulk sample due to the two phase transitions of Cu 2 S during the measured temperature range. As reported by Li et al, bulk Cu 2 S exhibits three phases (α-phase, β-phase, γ-phase) in the temperature ranges of >698, 378-698, and <378 K [35,36], respectively. The high temperature region to the right of the blue dashed line in Figures 6 and 7 is the γ-phase.…”

Section: Thermoelectric Transport Propertiessupporting

confidence: 59%

Synthesis and Thermoelectric Properties of Copper Sulfides via Solution Phase Methods and Spark Plasma Sintering

Tang

Feng

2017

Crystals

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Large-scale Cu 2 S tetradecahedrons microcrystals and sheet-like Cu 2 S nanocrystals were synthesized by employing a hydrothermal synthesis (HS) method and wet chemistry method (WCM), respectively. The morphology of α-Cu 2 S powders prepared by the HS method is a tetradecahedron with the size of 1-7 µm. The morphology of β-Cu 2 S is a hexagonal sheet-like structure with a thickness of 5-20 nm. The results indicate that the morphologies and phase structures of Cu 2 S are highly dependent on the reaction temperature and time, even though the precursors are the exact same. The polycrystalline copper sulfides bulk materials were obtained by densifying the as-prepared powders using the spark plasma sintering (SPS) technique. The electrical and thermal transport properties of all bulk samples were measured from 323 K to 773 K. The pure Cu 2 S bulk samples sintered by using the powders prepared via HS reached the highest thermoelectric figure of merit (ZT) value of 0.38 at 573 K. The main phase of the bulk sample sintered by using the powder prepared via WCM changed from β-Cu 2 S to Cu 1.8 S after sintering due to the instability of β-Cu 2 S during the sintering process. The Cu 1.8 S bulk sample with a Cu 1.96 S impurity achieved the highest ZT value of 0.62 at 773 K.

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Section: Thermoelectric Transport Propertiessupporting

confidence: 59%

Synthesis and Thermoelectric Properties of Copper Sulfides via Solution Phase Methods and Spark Plasma Sintering

Tang

Feng

2017

Crystals

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“…The fabrication and investigation of 2D materials are still needed for their further applications in various areas, such as the large‐scale controllable fabrication of high‐quality monolayer or few‐layer TMDs and the relatively poor transfer properties compared with the commercial materials. Based on this, novel improved methods, such as PVD, supercooling CVD, and so on, are considered to have potential in the synthesis of monolayer or few‐layer TMDs. Meanwhile, new materials with multifunctional properties, such as BP, PbI 2 , InSe, Cu 2 S, and so on, have been developed and studied.…”

Section: Discussionmentioning

confidence: 99%

“…Based on this, novel improved methods, such as PVD, supercooling CVD, and so on, are considered to have potential in the synthesis of monolayer or few‐layer TMDs. Meanwhile, new materials with multifunctional properties, such as BP, PbI 2 , InSe, Cu 2 S, and so on, have been developed and studied.…”

Section: Discussionmentioning

confidence: 99%

Various Structures of 2D Transition‐Metal Dichalcogenides and Their Applications

et al. 2018

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2D transition‐metal dichalcogenides (TMDs), which exhibit fascinating and fantastic properties, have promising applications in future electronic devices and photoelectric devices. Here, the recent research on 2D TMDs is summarized, including single components, 2D doped TMDs, and 2D van der Waals heterostructures. The physical picture, synthetic methods, and optoelectronic properties of these 2D materials are comprehensively described. Opportunities and emerging applications of 2D materials in the future are briefly discussed.

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“…34,35 One exotic characteristic of this kind of Cu 2 S films ( Figure 2c) is that the structure usually exists in a solid-liquid hybrid phase with a framework of graphene-like fixed S layers and mobile (liquid-like) Cu atoms within the framework. [34][35][36] For the substrate material, the bulk MnSe compound has a cubic rocksalt structure in which the Mn atoms in the (111) plane form a ferromagnetic (FM) triangular lattice, and the neighboring two Mn(111) planes, containing one Se plane between them, form an antiferromagnetic structure. 37,38 The Cu 2 S monolayer can be magnetized by the topmost FM Mn plane through the proximity effect.…”

Section: Methodsmentioning

confidence: 99%

Novel Chern insulators with half-metallic edge states

et al. 2018

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The central target of spintronics research is to achieve flexible control of highly efficient and spin-polarized electronic currents. Based on first-principles calculations and k·p models, we demonstrate that Cu 2 S/MnSe heterostructures are a novel type of Chern insulators with half-metallic chiral edge states and a very high Fermi velocity (0.87 × 10 6 m s − 1 ). The full spin-polarization of the edge states is found to be robust against the tuning of the chemical potential. Unlike the mechanisms reported previously, this heterostructure has quadratic bands with a normal band order, that is, the p/d-like band is below the s-like band. Charge transfer between the Cu 2 S moiety and the substrate results in variation in the occupied bands, which together with spin-orbit coupling, triggers the appearance of the topological state in the system. These results imply that numerous ordinary semiconductors with normal band order may convert into Chern insulators with half-metallic chiral edge states through this mechanism, providing a strategy to find a rich variety of materials for dissipationless, 100% spin-polarized and high-speed spintronic devices.

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Large‐Size 2D β‐Cu₂S Nanosheets with Giant Phase Transition Temperature Lowering (120 K) Synthesized by a Novel Method of Super‐Cooling Chemical‐Vapor‐Deposition

Cited by 67 publications

References 54 publications

Synthesis and Thermoelectric Properties of Copper Sulfides via Solution Phase Methods and Spark Plasma Sintering

Synthesis and Thermoelectric Properties of Copper Sulfides via Solution Phase Methods and Spark Plasma Sintering

Various Structures of 2D Transition‐Metal Dichalcogenides and Their Applications

Novel Chern insulators with half-metallic edge states

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Large‐Size 2D β‐Cu2S Nanosheets with Giant Phase Transition Temperature Lowering (120 K) Synthesized by a Novel Method of Super‐Cooling Chemical‐Vapor‐Deposition

Cited by 67 publications

References 54 publications

Synthesis and Thermoelectric Properties of Copper Sulfides via Solution Phase Methods and Spark Plasma Sintering

Synthesis and Thermoelectric Properties of Copper Sulfides via Solution Phase Methods and Spark Plasma Sintering

Various Structures of 2D Transition‐Metal Dichalcogenides and Their Applications

Novel Chern insulators with half-metallic edge states

Contact Info

Product

Resources

About

Large‐Size 2D β‐Cu₂S Nanosheets with Giant Phase Transition Temperature Lowering (120 K) Synthesized by a Novel Method of Super‐Cooling Chemical‐Vapor‐Deposition