Photoluminescence and UV photosensitivity of few-layered MoS2 nanosheets synthesized under different hydrothermal growth times

Ghaleghafi, Elahe; Rahmani, Mohammad; Wei, Zung‐Hang

doi:10.1007/s10853-021-06083-x

Cited by 19 publications

(19 citation statements)

References 61 publications

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“…This is because of the suppression of interatomic vibration of van der Waals forces that leads to increased force constants with an increase in the number of layers. 49 It is well established that the difference in the Raman shift of E 2g 1 and A 1g peaks can be used to determine the number of stacking layers of MoS 2 samples. 49 From Fig.…”

Section: Resultsmentioning

confidence: 99%

“…49 It is well established that the difference in the Raman shift of E 2g 1 and A 1g peaks can be used to determine the number of stacking layers of MoS 2 samples. 49 From Fig. 2b, we can see that the difference in the position of the E 2g 1 and A 1g peaks decreases with an increase in temperature, indicating a decrease in the number of MoS 2 layers at higher temperature.…”

Section: Resultsmentioning

confidence: 99%

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Exploring the Influence of Temperature and Time on the Formation and Properties of 3D Flower-Like MoS₂ Nanostructures Synthesized via Hydrothermal Method

Kumari,

Kumar

2023

ECS J. Solid State Sci. Technol.

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In this study, a simple hydrothermal method was employed to synthesize 3D flower-like MoS2 nanostructures. The influence of different synthesis temperatures on the structural, electronic, optical and morphological properties of the MoS2 nanostructures was thoroughly investigated, and the optimal temperature was identified as 220 °C. Additionally, we conducted further optimization to determine the most suitable reaction time, which was found to be 24 h. The characterization of the synthesized MoS2 nanostructures, employing various techniques such as X-ray diffraction, Raman spectroscopy, Mott-Schottky analysis, UV–vis-NIR spectroscopy and field emission scanning electron microscopy, unveiled well-defined crystallinity, reduced thickness and uniform morphology, under the optimized conditions. Notably, as the temperature increased from 180 °C to 220 °C, the band gap of MoS2 nanostructures exhibited a notable increase from 1.72 to 2.35 eV. The Mott-Schottky analysis further confirmed our findings, revealing lower values of flat band potential and carrier concentration for the optimized temperature (220 °C), indicative of higher crystallinity with fewer defects. These comprehensive findings not only underscore the significant impact of temperature and time on the properties of MoS2 nanostructures but also hold promising implications for diverse applications, including sensing, energy storage, as well as photocatalysis for hydrogen evolution reactions and organic pollutant degradation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Exploring the Influence of Temperature and Time on the Formation and Properties of 3D Flower-Like MoS₂ Nanostructures Synthesized via Hydrothermal Method

Kumari,

Kumar

2023

ECS J. Solid State Sci. Technol.

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“…This defect-rich structure of MoS 2 is commonly forms when the material is prepared by the hydro/ solvothermal synthesis methods. [37][38][39][40] Figure 2a shows the XRD pattern of the samples compared to the standard pattern of 2H-MoS 2 (ICSD-98-009-5569). The synthesized MoS 2 consisted of hexagonal molybdenite compounds that exhibited diffraction peaks at 2θ = 14.13, 33.70, 39.51, and 58.77 , which can be indexed to the (002), (011), (013), and (110) crystal planes, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, there were also many bundled crystal defects along the basal plane, which appeared as an irregular arrangement of atoms in the lattice structure (yellow circles in Figure 1g). This defect‐rich structure of MoS 2 is commonly forms when the material is prepared by the hydro/solvothermal synthesis methods 37–40 …”

Section: Resultsmentioning

confidence: 99%

Tuning surface wettability of MoS₂ to enhance solar‐driven evaporation rates

Emrinaldi

Dwiputra

Fareza

et al. 2023

Env Prog and Sustain Energy

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Molybdenum disulfide (MoS2), a promising two‐dimensional photothermal material, possesses the capability to convert solar irradiation into thermal energy. This conversion is beneficial for processes like wastewater treatment and seawater desalination. Nevertheless, the influence of the surface chemical properties of MoS2, particularly its wettability, on the evaporation rate of water confined to the surface remains unexplored. In our study, we demonstrate that the wettability degree of MoS2 significantly influences its water evaporation rate performance. Interestingly, this parameter can be simply and accurately modulated by altering the synthesis time of MoS2. We synthesized MoS2 via a simple hydrothermal method at three different durations: 16, 20, and 24 h, at 200°C. Subsequently, we impregnated the resultant MoS2 onto air‐laid paper (ALP), forming a solar‐driven evaporator system. We found that the MoS2 nanosheets synthesized within the shortest duration (MoS2‐16 h) exhibited the highest evaporation rate of 1.77 kg m−2 h−1, along with 92% energy efficiency. MoS2‐16 h resulted in MoS2 rich in defects, featuring the largest surface area and the smallest contact angle. The hydrophilic areas of MoS2‐16 h facilitated the continuous diffusion of water molecules through defect sites, treating them as contact lines. Additionally, the expansive surface area introduced a larger region for light absorption, enhancing water‐solid interactions. The presence of molybdenum oxide on the surface of the nanosheet system also contributed to superior wettability behavior. Notably, all the tested MoS2/ALP systems in this study displayed excellent performance in salt rejection and heavy metal ion concentration reduction.

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“…TMDs have an X-M-X layered structure so that its single layer includes a layer of the transition metal (M), which is between two layers of chalcogenide (X) atoms [16,17]. Although several different techniques such as sputtering, chemical vapor deposition, electrodeposition, and spray pyrolysis have been utilized for the synthesis of 2D materials, the hydrothermal method is relatively simple for large-scale, cost-effective preparation [18,19]. Out of the different TMDs, molybdenum disulfide (MoS 2 ) is one of the most stable systems that can be easily synthesized by hydrothermal process.…”

Section: Introductionmentioning

confidence: 99%

SERS-based detection of efficient removal of organic dyes using molybdenum dichalcogenide nanostructures

Thayil,

Cherukulappurath

2023

Nano Ex.

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In this paper we report a facile method for the removal of organic dyes from aqueous solution using molybdenum dichalcogenide (MoX2; X=S, Se, Te) based nanostructures. The molybdenum dichalcogenide nanostructures were synthesized chemically using the simple hydrothermal method. The samples were characterized by X-ray diffraction, Raman Spectroscopy, UV-Visible spectroscopy and scanning electron microscopy. The as-prepared samples have been utilized as an adsorbent for the removal of common organic dyes such as methylene blue (MB), methyl orange (MO), malachite green (MG), rhodamine B (RhB), rhodamine 6G (R6G) and mixtures of these organic dyes from aqueous solution. It was observed that among the synthesized samples, molybdenum disulfide (MoS2) presented excellent adsorption affinity towards these dyes. In addition, selective adsorption of MB in the presence of MO and RhB was demonstrated. Furthermore, the application of surface-enhanced Raman scattering (SERS) to monitor the degradation of the dyes in the experiments was also investigated.

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Photoluminescence and UV photosensitivity of few-layered MoS2 nanosheets synthesized under different hydrothermal growth times

Cited by 19 publications

References 61 publications

Exploring the Influence of Temperature and Time on the Formation and Properties of 3D Flower-Like MoS₂ Nanostructures Synthesized via Hydrothermal Method

Exploring the Influence of Temperature and Time on the Formation and Properties of 3D Flower-Like MoS₂ Nanostructures Synthesized via Hydrothermal Method

Tuning surface wettability of MoS₂ to enhance solar‐driven evaporation rates

SERS-based detection of efficient removal of organic dyes using molybdenum dichalcogenide nanostructures

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Photoluminescence and UV photosensitivity of few-layered MoS2 nanosheets synthesized under different hydrothermal growth times

Cited by 19 publications

References 61 publications

Exploring the Influence of Temperature and Time on the Formation and Properties of 3D Flower-Like MoS2 Nanostructures Synthesized via Hydrothermal Method

Exploring the Influence of Temperature and Time on the Formation and Properties of 3D Flower-Like MoS2 Nanostructures Synthesized via Hydrothermal Method

Tuning surface wettability of MoS2 to enhance solar‐driven evaporation rates

SERS-based detection of efficient removal of organic dyes using molybdenum dichalcogenide nanostructures

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Product

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Exploring the Influence of Temperature and Time on the Formation and Properties of 3D Flower-Like MoS₂ Nanostructures Synthesized via Hydrothermal Method

Exploring the Influence of Temperature and Time on the Formation and Properties of 3D Flower-Like MoS₂ Nanostructures Synthesized via Hydrothermal Method

Tuning surface wettability of MoS₂ to enhance solar‐driven evaporation rates