Ultrathin FeTe nanosheets with tetragonal and hexagonal phases synthesized by chemical vapor deposition

Wang, Xingguo; Bian, Ce; He, Yixiang; Guo, Jie; Zhang, Peng; Liu, Lixuan; Wei, Yi; Meng, Lingjia; Jiang, Huaning; Li, Bixuan; Nie, Anmin; Bao, Lihong; Gong, Yongji

doi:10.1016/j.mattod.2020.11.022

Cited by 38 publications

(56 citation statements)

References 59 publications

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“…[ 89 ] Liu et al and Gong et al presented the evolution from layered tetragonal FeTe single crystal to nonlayered hexagonal FeTe single crystal by precisely increasing the growth temperature. [ 88,124 ] In Figure 7b, Bartels et al reported the evolution from 1T‐MoTe 2 to 1T′‐MoTe 2 to 2H‐MoTe 2 few‐layer films by reducing the growth quench temperature. [ 121 ] Once the clam shell is opened, the process tube will be directly cooled by the fan.…”

Section: Synthetic Methodsmentioning

confidence: 99%

2D Metallic Transition‐Metal Dichalcogenides: Structures, Synthesis, Properties, and Applications

Zhao

Shen

Zhang

et al. 2021

Adv Funct Materials

182

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2D materials and the associated heterostructures define an ideal material platform for investigating physical and chemical properties, and exhibiting new functional applications in (opto)electronic devices, electrocatalysis, and energy storage. 2D transition metal dichalcogenides (2D TMDs), as a member of the 2D materials family including 2D semiconducting TMDs (s-TMDs) and 2D metallic/semimetallic TMDs (m-TMDs) have attracted considerable attention in the scientific community. Over the past decade, the 2D s-TMDs have been extensively researched and reviewed elsewhere. Because of their distinctive physical properties including intrinsic magnetism, chargedensity-wave order and superconductivity, and potential applications, such as high-performance electronic devices, catalysis, and as metal electrode contacts, 2D m-TMDs have grabbed widespread attention in recent years. However, reviews demonstrating the m-TMDs systematically and comprehensively have been rarely reported. Here, the recent advances in 2D m-TMDs in the aspects of their unique structures, synthetic approaches, distinctive physical properties, and functional applications are highlighted. Finally, the current challenges and perspectives are discussed.

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Section: Synthetic Methodsmentioning

confidence: 99%

2D Metallic Transition‐Metal Dichalcogenides: Structures, Synthesis, Properties, and Applications

Zhao

Shen

Zhang

et al. 2021

Adv Funct Materials

182

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“…The XPS results suggest the chemical states of the prepared nanoplates maybe have surface oxidation state. [ 40,42 ]…”

Section: Resultsmentioning

confidence: 99%

“…In the earlier reports, [ 39,40 ] it has been claimed that the growth (substrate) temperature controls the phases of 2D FeTe products using FeCl 2 and Te podwers as precursor. In this work, after careful investigation, we have found that both T‐FeTe and H‐FeTe nanosheets are obtained at high temperatures or low temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…[ 38 ] Kang et al have obtained T‐FeTe at lower temperature and H‐FeTe at the higher temperature, and experimentally verified that T‐FeTe and H‐FeTe nanoplates, respectively, feature antiferromagnetism and ferromagnetism. [ 39 ] Wang et al have further demonstrated oxygen‐doped tetragonal thick FeTe nanoplates display a superconducting transition at 9 K. [ 40 ] Based on the rich magnetic and electrical properties of FeTe nanoplates and other 2D materials, it is an urgent need to explore phase‐selective growth mechanism for the investigation of the relationship among different phases and properties. However, an in‐depth study of the mechanism of phase‐controllable growth of 2D materials has not been accomplished yet.…”

Section: Introductionmentioning

confidence: 99%

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Phase‐Selective Synthesis of Ultrathin FeTe Nanoplates by Controllable Fe/Te Atom Ratio in the Growth Atmosphere

Zhang

Hossain

et al. 2021

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Phase controllable synthesis of 2D materials is of significance for tuning related electrical, optical, and magnetic properties. Herein, the phase‐controllable synthesis of tetragonal and hexagonal FeTe nanoplates has been realized by a rational control of the Fe/Te ratio in a chemical vapor deposition system. Using density functional theory calculations, it has been revealed that with the change of the Fe/Te ratio, the formation energy of active clusters changes, causing the phase‐controllable synthesis of FeTe nanoplates. The thickness of the obtained FeTe nanoplates can be tuned down to the 2D limit (2.8 nm for tetragonal and 1.4 nm for hexagonal FeTe). X‐ray diffraction pattern, transmission electron microscopy, and high resolution scanning transmission electron microscope analyses exhibit the high crystallinity of the as‐grown FeTe nanoplates. The two kinds of FeTe nanoflakes show metallic behavior and good electrical conductivity, featuring 8.44 × 104 S m−1 for 9.8 nm‐thick tetragonal FeTe and 5.45 × 104 S m−1 for 7.6 nm‐thick hexagonal FeTe. The study provides an efficient and convenient route for tailoring the phases of FeTe nanoplates, which benefits to study phase‐sensitive properties, and may pave the way for the synthesis of other multiphase 2D nanosheets with controllable phases.

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“…On the other hand, the SA-CVD, which uses alkali-metal-free metal halides/oxyhalides (e.g., MoCl 5 , CrCl 3 , FeCl 2 , MoOCl 4 , WO 2 Cl 2 , etc. ), has proven promising to eliminate the detrimental effects of alkali metals ( Chu et al., 2019 ; Hu et al., 2021 ; Meng et al., 2021 ; Okada et al., 2014 ; Wang et al., 2021 ; Zhang et al., 2019 ). Replacing the metal organic precursors with the TM halides/oxyhalides in the MOCVD system could be a good alternative to realize high quality growth of 2D TMDC monolayers.…”

Section: Perspectivementioning

confidence: 99%

Salt-assisted chemical vapor deposition of two-dimensional transition metal dichalcogenides

Li¹

2021

iScience

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Summary Salt-assisted chemical vapor deposition (SA-CVD), which uses halide salts (e.g., NaCl, KBr, etc.) and molten salts (e.g., Na 2 MoO 4 , Na 2 WO 4 , etc.) as precursors, is one of the most popular methods favored for the fabrication of two-dimensional (2D) materials such as atomically thin metal chalcogenides, graphene, and h-BN. In this review, the distinct functions of halogens (F, Cl, Br, I) and alkali metals (Li, Na, K) in SA-CVD are first clarified. Based on the current development in SA-CVD growth and its related reaction modes, the existing methods are categorized into the Salt 1.0 (halide salts-based) and Salt 2.0 (molten salts-based) techniques. The achievements, advantages, and limitations of each technique are discussed in detail. Finally, new perspectives are proposed for the application of SA-CVD in the synthesis of 2D transition metal dichalcogenides for advanced electronics.

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Ultrathin FeTe nanosheets with tetragonal and hexagonal phases synthesized by chemical vapor deposition

Cited by 38 publications

References 59 publications

2D Metallic Transition‐Metal Dichalcogenides: Structures, Synthesis, Properties, and Applications

2D Metallic Transition‐Metal Dichalcogenides: Structures, Synthesis, Properties, and Applications

Phase‐Selective Synthesis of Ultrathin FeTe Nanoplates by Controllable Fe/Te Atom Ratio in the Growth Atmosphere

Salt-assisted chemical vapor deposition of two-dimensional transition metal dichalcogenides

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