Electrostatic control of photoluminescence from A and B excitons in monolayer molybdenum disulfide

Liu, Yuchun; Shen, Tianci; Zhu, Runlin; Linghu, Shuangyi; Gu, Fuxing

doi:10.1039/d2na00071g

Cited by 11 publications

(12 citation statements)

References 49 publications

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“…In general, PL in monolayer MoS 2 is attributed to the recombination of electrons in the conduction band and holes in the VB, and the direct band gap transitions were attributed to the emission of the A and B excitons, respectively. [27][28][29][30][31] The energy of the PL peak of the B exciton is approximately 0.1-0.2 eV higher than that of the A exciton due to strong spin-orbit coupling. 30) The A − peak is also a negatively charged A − exciton, known as a trion.…”

Section: Moomentioning

confidence: 99%

“…[27][28][29][30][31] The energy of the PL peak of the B exciton is approximately 0.1-0.2 eV higher than that of the A exciton due to strong spin-orbit coupling. 30) The A − peak is also a negatively charged A − exciton, known as a trion. 30,32) Strong PL caused by A excitons were observed with and without Na compound additive.…”

Section: Moomentioning

confidence: 99%

“…30) The A − peak is also a negatively charged A − exciton, known as a trion. 30,32) Strong PL caused by A excitons were observed with and without Na compound additive. The A peak positions were about 670 nm in wavelength and 1.85 eV in photon energy, which corresponding to the value of the band gap of monolayer MoS 2 .…”

Section: Moomentioning

confidence: 99%

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CVD synthesis of monolayer MoS₂ using Na compounds as additives to enhance two-dimensional growth

Goto

Oginö

2023

Jpn. J. Appl. Phys.

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Molybdenum disulfide (MoS2) is two-dimensional transition metal dichalcogenides that has garnered significant interest as a potential alternative to graphene. The synthesis of large-area monolayer MoS2 via chemical vapor deposition (CVD) is highly anticipated. To investigate the growth-promoting effect of sodium, NaCl and Na2SO4 were used as additives for CVD synthesis, as they have a similar melting point to the commonly used MoO3 precursor. The increase in the domain size of monolayer MoS2 with using Na compounds was confirmed through X-ray photoelectron spectroscopy analysis. The results suggested that the growth of MoS2 may have been promoted by the reaction of Na with S. Moreover, it was found that monolayer MoS2 with improved crystallinity and larger domain size could be synthesized using Na2SO2 as an additive compared to NaCl.

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Section: Moomentioning

confidence: 99%

Section: Moomentioning

confidence: 99%

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CVD synthesis of monolayer MoS₂ using Na compounds as additives to enhance two-dimensional growth

Goto

Oginö

2023

Jpn. J. Appl. Phys.

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“…With a direct bandgap, monolayer MoS 2 emits a relatively strong photoluminescence (PL) signal, arising from the radiative relaxation of excitonic states [8]. The PL spectrum from CVD-monolayer MoS 2 , namely the absolute intensity and energy position, is known to differ from that of mechanically exfoliated single-layer MoS 2 and has been reported to vary widely from sample to sample [24][25][26][27]. However, a rigorous comparison of the PL properties from different commercially available CVD-grown single-layer MoS 2 films has not been published in the literature.…”

Section: Introductionmentioning

confidence: 99%

Quantifying photoluminescence variability in monolayer molybdenum disulfide films grown by chemical vapour deposition

Healy,

Pain,

Lloyd-Hughes

et al. 2024

Mater. Res. Express

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Monolayer molybdenum disulfide (MoS2) is a promising candidate for inclusion in optoelectronic technologies, owing to its two-dimensional (2D) nature and resultant novel photoluminescence (PL). Chemical vapour deposition (CVD) is an important method for the preparation of large-area films of monolayer MoS2. The PL character of as-prepared monolayer MoS2 must be well understood to facilitate detailed evaluation of any process-induced effects during device fabrication. We comparatively explore the PL emission from four different commercially available CVD-grown MoS2 monolayer films. We characterize the samples via Raman and PL spectroscopy, using both single-spot and mapping techniques, while atomic force microscopy (AFM) is applied to map the surface structure. Via multipeak fitting, we decompose the PL spectra into constituent exciton and trion contributions, enabling an assessment of the quality of the MoS2 monolayers. We find that the PL character varies significantly from sample to sample. We also reveal substantial inhomogeneity of the PL signal across each individual MoS2 film. We attribute the PL variation to non-uniform MoS2 film morphologies that result from the nucleation and coalescence processes during the CVD film development. Understanding the large variability in starting PL behaviour is vital to optimize the optoelectronic properties for MoS2-based devices.

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“…The thermal conductivity of MoS 2 is between 80 and131 W/(m K), which has good thermal physical characteristics and stability. 18 When MoS 2 is added to the base liquid, the thermal conductivity of the base liquid can be significantly improved. Disperse stability is the key to the preparation of MoS 2 oil-based nanofluids.…”

Section: Introductionmentioning

confidence: 99%

Preparation of MoS₂/diesel dispersion nanofluid and its application in diluent blending‐viscosity reduction technology for heavy oil production

Ren

Jiang

et al. 2023

Asia-Pacific J Chem Eng

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Diluent blending‐viscosity reduction technology is an important method for heavy oil exploitation. For conventional diluent blending‐viscosity reduction technology, many disadvantages such as large amount of light oil and poor thermal conductivity limit its development in the oil field. In this paper, nano‐molybdenum disulfide (MoS2) with excellent thermal conductivity was added into diesel to improve the thermal conductivity of light oil, and the stability of MoS2/diesel dispersion was improved by adding the dispersant. The effect of diluent blending‐viscosity reduction technology was evaluated using MoS2/diesel dispersion as light oil system. The results showed that the dispersion effect of ultrasonic cell crusher was better than that of a homogenizer and ultrasonic cleaner; the stability of MoS2/diesel dispersions decrease with the increase of the dosage of nanoparticles and with temperature. A certain degree of mechanical oscillation can improve the stability of MoS2/diesel dispersions. Compared with Span‐80 and N,N‐dimethylformamide, the stability was significantly improved when the concentration of succinimide ashless dispersant was 1%. The evaluation of diluent blending‐viscosity reduction technology experiment shows that adding an appropriate dosage of MoS2 can reduce the amount of light oil and improve the viscosity reduction effect at low temperature. When the blending ratio was 5% at 50°C, the viscosity reduction rate of MoS2/diesel dispersion relative to diesel increased by 44.9%. Therefore, it is of great significance to reduce the energy consumption and increase the production of heavy oil by diluent blending‐viscosity reduction technology based on oil‐based nanofluids with high thermal conductivity.

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Electrostatic control of photoluminescence from A and B excitons in monolayer molybdenum disulfide

Abstract: Tailoring excitonic photoluminescence (PL) in molybdenum disulfide (MoS2) is critical for its various applications. Although significant efforts have been devoted to enhancing the PL intensity of monolayer MoS2, simultaneous tailoring...

Cited by 11 publications

References 49 publications

CVD synthesis of monolayer MoS₂ using Na compounds as additives to enhance two-dimensional growth

CVD synthesis of monolayer MoS₂ using Na compounds as additives to enhance two-dimensional growth

Quantifying photoluminescence variability in monolayer molybdenum disulfide films grown by chemical vapour deposition

Preparation of MoS₂/diesel dispersion nanofluid and its application in diluent blending‐viscosity reduction technology for heavy oil production

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Electrostatic control of photoluminescence from A and B excitons in monolayer molybdenum disulfide

Abstract: Tailoring excitonic photoluminescence (PL) in molybdenum disulfide (MoS2) is critical for its various applications. Although significant efforts have been devoted to enhancing the PL intensity of monolayer MoS2, simultaneous tailoring...

Cited by 11 publications

References 49 publications

CVD synthesis of monolayer MoS2 using Na compounds as additives to enhance two-dimensional growth

CVD synthesis of monolayer MoS2 using Na compounds as additives to enhance two-dimensional growth

Quantifying photoluminescence variability in monolayer molybdenum disulfide films grown by chemical vapour deposition

Preparation of MoS2/diesel dispersion nanofluid and its application in diluent blending‐viscosity reduction technology for heavy oil production

Contact Info

Product

Resources

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CVD synthesis of monolayer MoS₂ using Na compounds as additives to enhance two-dimensional growth

CVD synthesis of monolayer MoS₂ using Na compounds as additives to enhance two-dimensional growth

Preparation of MoS₂/diesel dispersion nanofluid and its application in diluent blending‐viscosity reduction technology for heavy oil production