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

Cao, Yunpeng; Luo, Xingfang; Yuan, Cailei; Han, Shuming; Yu, Ting; Li, Qinliang

doi:10.1016/j.physe.2015.07.017

Cited by 10 publications

(6 citation statements)

References 22 publications

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“…Li found that larger, dense exposed edges of vertical MoS 2 sheets can lead to a more active HER electro-catalyst [ 15 ]. However, while extensive studies have been devoted to two-dimensional materials which lie flat on the substrates [ 18 , 19 , 20 , 21 ], few reports have been developed regarding the growth of vertically standing MoS 2 nanosheets [ 6 , 11 , 22 , 23 , 24 , 25 , 26 ]. The growth of such vertically standing nanosheets is still challengeable, and more efforts should be made to explore the growth characteristics of nanosheets.…”

Section: Introductionmentioning

confidence: 99%

Morphological Evolution of Vertically Standing Molybdenum Disulfide Nanosheets by Chemical Vapor Deposition

et al. 2018

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In this study, we demonstrated the chemical vapor deposition (CVD) of vertically standing molybdenum disulfide (MoS2) nanosheets, with an unconventional combination of molybdenum hexacarbonyl (Mo(CO)6) and 1,2-ethanedithiol (C2H6S2) as the novel kind of Mo and S precursors respectively. The effect of the distance between the precursor’s outlet and substrates (denoted as d) on the growth characteristics of MoS2, including surface morphology and nanosheet structure, was investigated. Meanwhile, the relationship between the structure characteristics of MoS2 nanosheets and their catalytic performance for hydrogen evolution reaction (HER) was elucidated. The formation of vertically standing nanosheets was analyzed and verified by means of an extrusion growth model. The crystallinity, average length, and average depth between peak and valley (Rz) of MoS2 nanosheets differed depending on the spatial location of the substrate. Good crystalized MoS2 nanosheets grown at d = 5.5 cm with the largest average length of 440 nm, and the highest Rz of 162 nm contributed to a better HER performance, with a respective Tafel slope and exchange current density of 138.9 mV/decade, and 22.6 μA/cm2 for raw data (127.8 mV/decade and 19.3 μA/cm2 for iR-corrected data).

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Section: Introductionmentioning

confidence: 99%

Morphological Evolution of Vertically Standing Molybdenum Disulfide Nanosheets by Chemical Vapor Deposition

et al. 2018

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“…From the aforesaid experiments, the optimized value of D S–Mo for MoS 2 monolayer growth, having the average side length for triangular morphology of 6–10 μm, is found to be 33 cm. For a lower value of D S–Mo (<30 cm), poor quality of growth on the substrate surface is attributed to the insufficient diffusion time of S atoms on their desired lattice locations, while for higher values of D S–Mo (>33 cm), improper growth takes place due to a negligible amount of S flux reaching at the nucleation sites. , In order to further enhance the crystal size, optimizations of other growth parameters are performed keeping D S–Mo fixed at 33 cm.…”

Section: Resultsmentioning

confidence: 99%

Large and Uniform Single Crystals of MoS₂ Monolayers for ppb-Level NO₂ Sensing

Patel

Singh

Dubey

et al. 2022

ACS Appl. Nano Mater.

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Recently, unprecedented interest has been immersed toward the synthesis of two-dimensional (2D) transition metal dichalcogenides via the chemical vapor deposition (CVD) system. Synthesis of a uniform and large-sized monolayer MoS2 atomic thin film via CVD is still a major bottleneck owing to strong dependence on diverse associated growth parameters. In this work, we have proposed the most viable recipe which is suitable for controlling the nucleation density of Mo and producing a 90 μm-long MoS2 monolayer crystal and (695 × 394.8) μm2 large MoS2 monolayered film on SiO2/Si and c-plane sapphire, respectively. Moreover, MoS2 monolayer sensing performance has been thoroughly investigated for NO2 exposure at room temperature with a varying response of 4–57.5 for the 100–100 ppm level. Furthermore, the MoS2 monolayer sensor exhibits an ultrasensitive NO2 detection with limit of detection and limit of qualification values of 1.4 and 4.6 ppb, respectively. In addition, the first-principles-based density functional theory has been employed to analyze the adsorption of NO2 on the surfaces of the 2D MoS2 monolayer. It is observed that the electronic band gap of the MoS2 monolayer after NO2 adsorption is reduced by 0.7 eV due to molecular orbital hybridization.

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“…Under the S sufficient atmosphere condition, the MoS 2 crystals are more likely to grow under "kinetic" conditions rather than thermodynamic ones, which is typical for nanocrystals with high precursor feedstock. Therefore, the increase in precursor concentration has an effect of promoting the crystal growth rate, resulting in the formation of MoS 2 nanowire, which is not favorable for the production of high-quality two-dimensional crystal 18,19 . In order to clarify the structure and quality of the MoS 2 nanowires, XRD and Raman spectroscopy measurements had been performed.…”

Section: Resultsmentioning

confidence: 99%

Horizontal growth of MoS₂ nanowires by chemical vapour deposition

et al. 2015

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We describe single step route for the synthesis of MoS2 wires using chemical vapour deposition (CVD) method. By tuning the CVD growth parameters, the horizontally oriented MoS2 nanowires on SiO2/Si substrate can be synthesized successfully. The MoS2 nanowire has height of about 93 nm and width of about 402 nm with multilayer structure. Good local photoluminescence (PL) properties can be observed for these horizontal MoS2 nanowires. The successful fabrication and prominent PL effect of the horizontal MoS2 nanowires provide potential applications for the MoS2-based in planar devices.

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

Cited by 10 publications

References 22 publications

Morphological Evolution of Vertically Standing Molybdenum Disulfide Nanosheets by Chemical Vapor Deposition

Morphological Evolution of Vertically Standing Molybdenum Disulfide Nanosheets by Chemical Vapor Deposition

Large and Uniform Single Crystals of MoS₂ Monolayers for ppb-Level NO₂ Sensing

Horizontal growth of MoS₂ nanowires by chemical vapour deposition

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

Cited by 10 publications

References 22 publications

Morphological Evolution of Vertically Standing Molybdenum Disulfide Nanosheets by Chemical Vapor Deposition

Morphological Evolution of Vertically Standing Molybdenum Disulfide Nanosheets by Chemical Vapor Deposition

Large and Uniform Single Crystals of MoS2 Monolayers for ppb-Level NO2 Sensing

Horizontal growth of MoS2 nanowires by chemical vapour deposition

Contact Info

Product

Resources

About

Large and Uniform Single Crystals of MoS₂ Monolayers for ppb-Level NO₂ Sensing

Horizontal growth of MoS₂ nanowires by chemical vapour deposition