Single crystal monolayer MoS2 triangles with wafer-scale spatial uniformity by MoO3 pre-deposited chemical vapor deposition

Cheng, Zhaofang; Xia, Minggang; Hu, Ruixue; Liang, Chunping; Liang, Gongying; Zhang, Shengli

doi:10.1016/j.jcrysgro.2017.09.024

Cited by 11 publications

(8 citation statements)

References 27 publications

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“…Based on the rules of crystal growth, 38 the practical initiative is put forward to realize particle size control. Namely, the growth process of metal hydroxides or oxides can be controlled by adjusting the ionic strength of targeted metal ions.…”

Section: Introductionmentioning

confidence: 99%

“…Ji et al used the α-MnO 2 cathode as the research object, which delivered a long cycling life of 58% retention after 300 cycles at 100 mA g –1 . Based on the rules of crystal growth, the practical initiative is put forward to realize particle size control. Namely, the growth process of metal hydroxides or oxides can be controlled by adjusting the ionic strength of targeted metal ions.…”

Section: Introductionmentioning

confidence: 99%

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Controlling the Aspect Ratio of α-MnO₂ via the Confined-Space Growth Effect to Enhance the Performance in Aqueous Zinc-Ion Storage

Chen

et al. 2023

ACS Appl. Energy Mater.

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α-MnO 2 nanorods with large 2 × 2 tunnels are often selected as storage materials in aqueous zinc-ion batteries due to their high theoretical capacity, environmental friendliness, and low cost. The electrochemical performance is strongly associated with their particle size; however, many techniques for controlling size include undesirable contents, such as carbon-containing components, which reduce the overall energy density of the electrodes. In this paper, Ni(II) ions are introduced to hinder the spatial growth during the preparation of α-MnO 2 , hence tuning the aspect ratio and enhancing the zinc-ion storage performance. The confinedspace effect is employed by controlling the size of α-MnO 2 particles, in which the initial long rods at the micron scale have become tiny α-MnO 2 nanorods. Smaller particle size electrode materials offer shorter ion diffusion paths, greater electron transport efficiency, and more sufficient solid−liquid interface space due to the small size effect, which also determines the capacity and lifetime of batteries. At the same time, Ni(II) addition selectively hinders the growth direction (001) plane, which effectively shrinks Zn(II) and electron transport paths. As a result, the prepared α-MnO 2 nanorods obtained a high capacity (272 mA h g −1 at 50 mA g −1 ) and stable cycling stability (70% capacity retention after 500 cycles at 500 mA g −1 ). These results demonstrate that the introduction of uncoordinated ions is an effective way to control the metal oxide size and provide a direction in the development of electrode materials for secondary batteries.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Controlling the Aspect Ratio of α-MnO₂ via the Confined-Space Growth Effect to Enhance the Performance in Aqueous Zinc-Ion Storage

Chen

et al. 2023

ACS Appl. Energy Mater.

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“…20 However, the spatial distribution of precursor vapor concentration is inhomogeneous, resulting in monolayer MoS 2 domains with nonuniform sizes on the substrate. 13,21 Furthermore, whether the surface sulfurization reaction of precursors 22,23 or surface nucleation growth after gas phase sulfurization 24,25 is utilized, random nucleation sites are inevitably generated on the substrate or on the monolayer MoS 2 , which degrades the film quality. In addition, to control the location and density of nucleation sites on the surface, Li et al 26 utilized gold as a heterogeneous nucleation site to grow MoS 2 , but the residual gold species were difficult to remove.…”

Section: ■ Introductionmentioning

confidence: 99%

Vapor–Liquid–Solid Growth of Site-Controlled Monolayer MoS₂ Films Via Pressure-Induc ed Supercritical Phase Nucleation

Wang

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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In this study, a novel pressure-induced supercritical phase nucleation method is proposed to synthesize monolayer MoS2 films, which is promoter free and can avoid contamination of films derived from these heterogeneous promoters in most of the existing techniques. The low-crystallinity and size-controlled MoO2(acac)2 particles are recrystallized on the substrate via the pressure-sensitive solvent capacity of supercritical CO2 and these particles are used as growth sites. The size of single-crystal MoS2 on the substrate is found to be dependent on the wetting area of the pyrolyzed precursor droplets (MoO2) on the surface, and the formation of continuous films with high coverage is mainly controlled by the coalescence of MoO2 droplets. It is enhanced by the increase of the nucleation site density, which can be adjusted by the supersaturation of the supercritical fluid solution. Our findings pave a new way for the controllable growth of MoS2 and other two-dimensional materials and provide sufficient and valuable evidence for vapor–liquid–solid growth.

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“…To achieve the large-area growth of monolayer MoS 2 , various methods have been reported, including confined-space CVD, reverse-flow chemical vapor epitaxy, inorganic vapor CVD, and metal organic CVD, etc. [ 38 , 39 , 40 , 41 , 42 , 43 , 44 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Carbon-Assisted Chemical Vapor Deposition Growth of Large-Area Uniform Monolayer MoS2 and WS2

Bae

Yoo

2021

Nanomaterials

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Monolayer MoS2 can be used for various applications such as flexible optoelectronics and electronics due to its exceptional optical and electronic properties. For these applications, large-area synthesis of high-quality monolayer MoS2 is highly desirable. However, the conventional chemical vapor deposition (CVD) method using MoO3 and S powder has shown limitations in synthesizing high-quality monolayer MoS2 over a large area on a substrate. In this study, we present a novel carbon cloth-assisted CVD method for large-area uniform synthesis of high-quality monolayer MoS2. While the conventional CVD method produces thick MoS2 films in the center of the substrate and forms MoS2 monolayers at the edge of the thick MoS2 films, our carbon cloth-assisted CVD method uniformly grows high-quality monolayer MoS2 in the center of the substrate. The as-synthesized monolayer MoS2 was characterized in detail by Raman/photoluminescence spectroscopy, atomic force microscopy, and transmission electron microscopy. We reveal the growth process of monolayer MoS2 initiated from MoS2 seeds by synthesizing monolayer MoS2 with varying reaction times. In addition, we show that the CVD method employing carbon powder also produces uniform monolayer MoS2 without forming thick MoS2 films in the center of the substrate. This confirms that the large-area growth of monolayer MoS2 using the carbon cloth-assisted CVD method is mainly due to reducing properties of the carbon material, rather than the effect of covering the carbon cloth. Furthermore, we demonstrate that our carbon cloth-assisted CVD method is generally applicable to large-area uniform synthesis of other monolayer transition metal dichalcogenides, including monolayer WS2.

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Single crystal monolayer MoS2 triangles with wafer-scale spatial uniformity by MoO3 pre-deposited chemical vapor deposition

Cited by 11 publications

References 27 publications

Controlling the Aspect Ratio of α-MnO₂ via the Confined-Space Growth Effect to Enhance the Performance in Aqueous Zinc-Ion Storage

Controlling the Aspect Ratio of α-MnO₂ via the Confined-Space Growth Effect to Enhance the Performance in Aqueous Zinc-Ion Storage

Vapor–Liquid–Solid Growth of Site-Controlled Monolayer MoS₂ Films Via Pressure-Induc ed Supercritical Phase Nucleation

A Novel Carbon-Assisted Chemical Vapor Deposition Growth of Large-Area Uniform Monolayer MoS2 and WS2

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Single crystal monolayer MoS2 triangles with wafer-scale spatial uniformity by MoO3 pre-deposited chemical vapor deposition

Cited by 11 publications

References 27 publications

Controlling the Aspect Ratio of α-MnO2 via the Confined-Space Growth Effect to Enhance the Performance in Aqueous Zinc-Ion Storage

Controlling the Aspect Ratio of α-MnO2 via the Confined-Space Growth Effect to Enhance the Performance in Aqueous Zinc-Ion Storage

Vapor–Liquid–Solid Growth of Site-Controlled Monolayer MoS2 Films Via Pressure-Induc ed Supercritical Phase Nucleation

A Novel Carbon-Assisted Chemical Vapor Deposition Growth of Large-Area Uniform Monolayer MoS2 and WS2

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Product

Resources

About

Controlling the Aspect Ratio of α-MnO₂ via the Confined-Space Growth Effect to Enhance the Performance in Aqueous Zinc-Ion Storage

Controlling the Aspect Ratio of α-MnO₂ via the Confined-Space Growth Effect to Enhance the Performance in Aqueous Zinc-Ion Storage

Vapor–Liquid–Solid Growth of Site-Controlled Monolayer MoS₂ Films Via Pressure-Induc ed Supercritical Phase Nucleation