Influences of carrier gas flow rate on the morphologies of MoS2 flakes

Cao, Yunpeng; Luo, Xingfang; Han, Shuming; Yuan, Cailei; Yang, Yong; Li, Qinliang; Yu, Ting; Ye, Shuangli

doi:10.1016/j.cplett.2015.05.001

Cited by 39 publications

(19 citation statements)

References 22 publications

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“…Even gas flow rates further increased from 160 to 280 sccm. The concentration of S vapor was not enough to maintain reactions of MoS 2 synthesizing [ 32 ]. Therefore, the nucleation density of MoS 2 decreased and the shape of MoS 2 domains changed from disconnected film, to large triangles, then to small triangles ( Figure 4 f–h).…”

Section: Resultsmentioning

confidence: 99%

Control of the Nucleation Density of Molybdenum Disulfide in Large-Scale Synthesis Using Chemical Vapor Deposition

Zhou

Zheng

et al. 2018

Materials

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Atmospheric pressure chemical vapor deposition (CVD) is presently a promising approach for preparing two-dimensional (2D) MoS2 crystals at high temperatures on SiO2/Si substrates. In this work, we propose an improved CVD method without hydrogen, which can increase formula flexibility by controlling the heating temperature of MoO3 powder and sulfur powder. The results show that the size and coverage of MoS2 domains vary largely, from discrete triangles to continuous film, on substrate. We find that the formation of MoS2 domains is dependent on the nucleation density of MoS2. Laminar flow theory is employed to elucidate the cause of the different shapes of MoS2 domains. The distribution of carrier gas speeds at the substrate surface leads to a change of nucleation density and a variation of domain morphology. Thus, nucleation density and domain morphology can be actively controlled by adjusting the carrier gas flow rate in the experimental system. These results are of significance for understanding the growth regulation of 2D MoS2 crystals.

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Section: Resultsmentioning

confidence: 99%

Control of the Nucleation Density of Molybdenum Disulfide in Large-Scale Synthesis Using Chemical Vapor Deposition

Zhou

Zheng

et al. 2018

Materials

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“…Controlling the CVD growth parameters to achieve dendritic shaped MoS2 domains increases the number of catalytic sites relative to areal coverage. 41,43 Although it has been reported that the morphology of monolayer MoS2 is variable by modifying the heated temperature and carrier gas flow rate in CVD, 41,44,45 the change in domain shape is constricted within a narrow range and the lateral size is small. Few-layer dendritic MoS2…”

Section: Introductionmentioning

confidence: 99%

Large Dendritic Monolayer MoS₂ Grown by Atmospheric Pressure Chemical Vapor Deposition for Electrocatalysis

Zhou

et al. 2018

ACS Appl. Mater. Interfaces

116

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The edge sites of MoS are catalytically active for the hydrogen evolution reaction (HER), and growing monolayer structures that are edge-rich is desirable. Here, we show the production of large-area highly branched MoS dendrites on amorphous SiO/Si substrates using an atmospheric pressure chemical vapor deposition and explore their use in electrocatalysis. By tailoring the substrate construction, the monolayer MoS evolves from triangular to dendritic morphology because of the change of growth conditions. The rough edges endow dendritic MoS with a fractal dimension down to 1.54. The highly crystalline basal plane and the edge of the dendrites are visualized at atomic resolution using an annular dark field scanning transmission electron microscope. The monolayer dendrites exhibit strong photoluminescence, which is indicative of the direct band gap emission, which is preserved after being transferred. Post-transfer sulfur annealing restores the structural defects and decreases the n-type doping in MoS monolayers. The annealed MoS dendrites show good and highly durable HER performance on the glassy carbon with a large exchange current density of 32 μA cm, demonstrating its viability as an efficient HER catalyst.

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“…However, the sulfurization of MoO 3 using the CVD method consists of highly controlled parameters during growth. Our previous works demonstrated that the Ar flow rate in the synthesis can influence the crystal growth, and thus influence the morphologies evolution of MoS 2 flakes [17]. The relationship between MoS 2 morphology and the chemical environment is also another fundamental problem apparent in the growth process have not been clarified.…”

Section: Introductionmentioning

confidence: 98%

Morphology engineering of monolayer MoS 2 by adjusting chemical environment during growth

Cao

Luo

Yuan

et al. 2015

Physica E: Low-dimensional Systems and Nanostructures

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Influences of carrier gas flow rate on the morphologies of MoS2 flakes

Cited by 39 publications

References 22 publications

Control of the Nucleation Density of Molybdenum Disulfide in Large-Scale Synthesis Using Chemical Vapor Deposition

Control of the Nucleation Density of Molybdenum Disulfide in Large-Scale Synthesis Using Chemical Vapor Deposition

Large Dendritic Monolayer MoS₂ Grown by Atmospheric Pressure Chemical Vapor Deposition for Electrocatalysis

Morphology engineering of monolayer MoS 2 by adjusting chemical environment during growth

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Influences of carrier gas flow rate on the morphologies of MoS2 flakes

Cited by 39 publications

References 22 publications

Control of the Nucleation Density of Molybdenum Disulfide in Large-Scale Synthesis Using Chemical Vapor Deposition

Control of the Nucleation Density of Molybdenum Disulfide in Large-Scale Synthesis Using Chemical Vapor Deposition

Large Dendritic Monolayer MoS2 Grown by Atmospheric Pressure Chemical Vapor Deposition for Electrocatalysis

Morphology engineering of monolayer MoS 2 by adjusting chemical environment during growth

Contact Info

Product

Resources

About

Large Dendritic Monolayer MoS₂ Grown by Atmospheric Pressure Chemical Vapor Deposition for Electrocatalysis