Probing on crystallographic structural and surface morphology of hydrothermally synthesized MoS2 nanoflowers consisting of nanosheets

Kumar, Naveen; Siroha, Piyush; Sharma, Yashpal; Singh, Deepak; Dey, Kajal Kumar; Kumar, Rajesh; Borkar, Hitesh; Gangwar, Jitendra

doi:10.1016/j.apsadv.2021.100167

Cited by 25 publications

(14 citation statements)

References 65 publications

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“…The lowering of FWHM is directly related to the increase of the (002) peak intensity with the increase of the S molar ratio, which further indicates an improved crystallinity of MoS 2 . Moreover, the calculated crystallite size of the synthesized samples is in the range of 6.65–8.89 nm . The crystallite size first decreased for S2 samples and then increased up to the S5 sample, following an opposite trend as FWHM with an increased Mo/S molar ratio.…”

Section: Results and Discussionmentioning

confidence: 93%

Synthesis of MoS₂ Nanoflowers for Photocatalytic Degradation of Organic Dyes

Nayak,

Kumar,

Thangavel

2023

ACS Appl. Nano Mater.

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using a simple hydrothermal method. The (002) peak at 2θ ∼ 14°in the X-ray diffraction (XRD) pattern confirms the hexagonal phase of the synthesized MoS 2 nanostructures, which agrees well with Raman and high-resolution transmission electron microscopy study. Furthermore, field emission scanning electron microscopy analysis reveals that the synthesized MoS 2 with Mo/S molar ratios of 1:5 and 1:6 exhibits a nanoflower-like structure, significantly enhancing the photocatalytic activity. The methylene blue (MB) and phenolphthalein dye degradation efficiencies and rate constants of MoS 2 are enhanced with the rise of Mo/S molar ratio under sunlight illumination. Specifically, MoS 2 nanoflowers with a 1:5 molar ratio showed the maximum MB dye degradation efficiency of 98% and a rate constant of 0.132 cm −1 in 25 min of sunlight illumination. In addition, a maximum photocurrent density of 22 mA/ cm 2 has been achieved at −0.6 V vs Ag/AgCl for a 1:5 molar ratio sample. Moreover, the lowest charge-transfer resistance, highest carrier density, and carrier mobility enhance the photocatalytic activity of the 1:5 molar ratio sample with better separation of charge carriers and reduced carrier recombination rate. Hence, the synthesized MoS 2 nanostructures with a 1:5 molar ratio of Mo/S are the optimized sample with enhanced photocatalytic and photoelectrochemical performances. The electronic and photocatalytic properties of MoS 2 have been investigated theoretically with the variation of the layer number.

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Section: Results and Discussionmentioning

confidence: 93%

Synthesis of MoS₂ Nanoflowers for Photocatalytic Degradation of Organic Dyes

Nayak,

Kumar,

Thangavel

2023

ACS Appl. Nano Mater.

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“…Transition metal dichalcogenides (TMDs), such as MoS 2 , MoSe 2 , WS 2 , and WSe 2 , are layered materials with adjustable band gaps. TMDs have been recently studied because their structures can be transformed from bulk (indirect) to layered (direct transition) structures, − affording TMDs with special physical properties that may be useful for fabricating future semiconductor devices. , Because layered structures, nanostructures, and other structures of MoS 2 have interesting electronic and optical properties, − they have been studied by many researchers and applied in next-generation electronic and optoelectronic devices such as optotransistors, − photodetectors, − and batteries. − However, pure MoS 2 exhibits poor photoelectrochemical (PEC) activity because the photogenerated electron–hole pairs rapidly recombine before migrating to the surface for reactions. − Combining MoS 2 -based heterostructures with different semiconductors or metals is an effective method to inhibit electron–hole pair recombination and improve the PEC properties of MoS 2 . For example, CuS, CuO, , and Ag 2 S − have been combined with MoS 2 , and the resulting composites have shown considerable potential for PEC applications.…”

Section: Introductionmentioning

confidence: 99%

Engineering the Interface of Cu/MoS₂ Nanostructures for Improved Charge Transfer for Applications as PEC Anode Materials

Shi

Yao

et al. 2023

ACS Appl. Nano Mater.

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Electronic structures of metal and semiconductor composites play a crucial role in photoelectric conversion. To obtain a fast-response photoelectrochemical (PEC) anode, its orbital regulation is a challenge. Herein, the occupancy state of the d orbitals of Mo is adjusted to achieve high-efficiency photoelectric conversion by adjusting the quantity of Cu by magnetron sputtering deposited in Cu/MoS2 composites. Characterization results indicate that the SEM morphology of MoS2 changes distinctly. Meanwhile, the (111) and (200) diffraction peaks and 0 and 2+ valence states of Cu appeared in XRD and XPS, respectively, confirming the successful synthesis of Cu/MoS2. The prior band shift at the heterojunction causes efficient separation of photogenerated charge carriers and the shift of the position of Mo 3d to higher binding energies, which results in weaker intrinsic luminescence at 810 nm in the PL spectrum and smaller charge transfer resistance in the electrochemical impedance spectroscopy spectra, confirming the high PEC performance of the Cu/MoS2 composites. Meanwhile, the density functional theory calculations reveal that the energy of the d orbital of Mo in MoS2 decreases, which is helpful to accept electrons in Cu 3d. The Mo d track-occupancy introduced through the strong interplay between the most desirable combination of MoS2 and Cu will be accountable for such record-high performance. Therefore, this study makes a strong case for fine-tuning the electronic structures of PEC anode materials.

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“…19 Different approaches can be used to synthesize varied QDs, demanding different reaction times, reactants, waste treatment, purification steps, etc. The hydrothermal synthesis approach, in general, can yield functionalized MoS 2 nanostructures with different morphological characteristics, including nanosheets 20 and nanoflowers. 21 Additionally, MoS 2 QDs with distinct PL characteristics have been produced by this method by modulating some experimental synthesis parameters.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of Fluorescent Functionalized MoS₂ Quantum Dots for Heavy Metal Detection

Schneider,

Facure,

Teodoro

et al. 2023

ACS Appl. Nano Mater.

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Probing on crystallographic structural and surface morphology of hydrothermally synthesized MoS2 nanoflowers consisting of nanosheets

Cited by 25 publications

References 65 publications

Synthesis of MoS₂ Nanoflowers for Photocatalytic Degradation of Organic Dyes

Synthesis of MoS₂ Nanoflowers for Photocatalytic Degradation of Organic Dyes

Engineering the Interface of Cu/MoS₂ Nanostructures for Improved Charge Transfer for Applications as PEC Anode Materials

Hydrothermal Synthesis of Fluorescent Functionalized MoS₂ Quantum Dots for Heavy Metal Detection

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Probing on crystallographic structural and surface morphology of hydrothermally synthesized MoS2 nanoflowers consisting of nanosheets

Cited by 25 publications

References 65 publications

Synthesis of MoS2 Nanoflowers for Photocatalytic Degradation of Organic Dyes

Synthesis of MoS2 Nanoflowers for Photocatalytic Degradation of Organic Dyes

Engineering the Interface of Cu/MoS2 Nanostructures for Improved Charge Transfer for Applications as PEC Anode Materials

Hydrothermal Synthesis of Fluorescent Functionalized MoS2 Quantum Dots for Heavy Metal Detection

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Product

Resources

About

Synthesis of MoS₂ Nanoflowers for Photocatalytic Degradation of Organic Dyes

Synthesis of MoS₂ Nanoflowers for Photocatalytic Degradation of Organic Dyes

Engineering the Interface of Cu/MoS₂ Nanostructures for Improved Charge Transfer for Applications as PEC Anode Materials

Hydrothermal Synthesis of Fluorescent Functionalized MoS₂ Quantum Dots for Heavy Metal Detection