Influence of anharmonicity and interlayer interaction on Raman spectra in mono- and few-layer MoS2: A computational study

Romaniuk, Yurii A.; Golovynskyi, Sergii; Litvinchuk, A. P.; Dong, Dan; Lin, Yan; Datsenko, Oleksandr I.; Bosi, Matteo; Seravalli, L.; Babichuk, I.S.; Yukhymchuk, V.О.; Li, Baikui; Qu, Junle

doi:10.1016/j.physe.2021.114999

Cited by 12 publications

(7 citation statements)

References 76 publications

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“…In particular, χ = χ T + χ V , where χ T is the shift of self-energy caused by the phonon mode coupling and χ V is the shift induced by a volume change due to thermal expansion. , The fitted value of χ for the A 1g 1 mode is 0.0082 cm–1K–1. The coefficient χ of GaSe flakes is comparable or lower than those of other reported 2D materials, which are correlated to the vdW interaction between adjacent layers. − A stronger vdW interaction between individual layers leads to larger χ in -0.023 cm–1K–1 (BP), SnS, and SnSe . From these results, it is suggested that GaSe owns a week contribution from lattice thermal expansion and a strong anharmonic effect in adjacent layers of the GaSe crystal.…”

Section: Resultsmentioning

confidence: 66%

Raman Scattering and Exciton Photoluminescence in Few-Layer GaSe: Thickness- and Temperature-Dependent Behaviors

et al. 2022

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The optical properties of few-layer (FL) GaSe are investigated using thickness-and temperature-dependent Raman scattering and photoluminescence (PL) spectroscopies. The vibrational modes exhibit linear softening with increasing temperature, with temperature coefficient values related to anharmonic phonon− phonon/electron coupling. Micro-PL is used to study the variation of exciton bands and structural features of FL GaSe. The temperature-dependent study from 100 to 380 K shows that the PL red-shifts due to a band gap narrowing, while the intensity decreases attributable to thermally stimulated nonradiative recombination caused by an increase in the electron−phonon interaction. The behavior of free and bound excitons and deep defect PL with temperature is studied by fitting the PL spectra with modeling equations. This enables the evaluation of their quenching activation energies and other significant aspects. The exciton binding energy of 0.3 eV has been calculated for the excitons in 10L GaSe. These novel findings extend the knowledge on the variety of exciton and deep defect levels in 2D GaSe and are important for its future applications in nano-optoelectronics involving external influence of optical properties.

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Section: Resultsmentioning

confidence: 66%

Raman Scattering and Exciton Photoluminescence in Few-Layer GaSe: Thickness- and Temperature-Dependent Behaviors

et al. 2022

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“…[49] Compared with pure SnSe 2 , the A 1g peak of LBL-SnSe 2 @MXene slightly shifts toward a lower wavenumber, which is probably caused by the anharmonic effect and interfacial strain between SnSe 2 and MXene. [50,51] In addition, the peaks at 413 and 617 cm −1 are assigned to the Ti-C bond of MXene. [52,53] The XPS and Raman results demonstrate the high purity of SnSe 2 and MXene in the LBL-SnSe 2 @MXene.…”

Section: Terminal Group-oriented Self-assembly Strategymentioning

confidence: 99%

Terminal Group‐Oriented Self‐Assembly to Controllably Synthesize a Layer‐by‐Layer SnSe₂ and MXene Heterostructure for Ultrastable Lithium Storage

Kong

Zhao

et al. 2023

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capability, and ultrastable cycling performance (410 mAh g −1 after 16 000 cycles at 5 C). Experimental analysis and DFT calculations demonstrate that the LBL-SnSe 2 @MXene possesses superior lithium adsorption ability, excellent lithium transport capability, and remarkable structure stability. Therefore, the LBL-SnSe 2 @MXene is a very promising anode material for next-generation high-performance LIBs.

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“…The power density of laser irradiation did not exceed ≈10 6 W cm −2 to avoid changes in the film structure during the measurements. [51][52][53][54][55][56] Raman mapping was performed on an area of 50 × 50 μm 2 with a lateral resolution of 2 μm. High-quality imaging mapping was provided by a moving stage (Märzhäuser scanning stage with the TANGO controller, Germany) and a confocal microscope (Olympus BX-43, Japan) with a 20× lens.…”

Section: Characterizationmentioning

confidence: 99%

Skin‐Adhesive Flexible Force Sensors Based on Piezoelectric Poly(l‐lactic acid) for Human Behavior Recognition

Lin

Zhu

et al. 2023

Adv Materials Technologies

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The application of biodegradable films based on the piezoelectric effect of poly-l-lactic acid (PLLA) in sensors, transducers, actuators, and so on has gradually become one of the emerging research focuses. In this work, a flexible PLLA sensor with UV-curable acrylate film packaging is proposed for human behavior recognition. The acrylic films with different proportions have different mechanical and surface properties, showing good flexibility, ductility, and skin adhesion. The morphology and crystal structure of the PLLA films and UV curable substrate obtained under the various postprocessing conditions and different proportions are examined by scanning electron microscopy, X-ray diffraction, Raman, and ATR-FTIR spectroscopy. In addition, by comparing six groups of PLLA films with different treatment conditions, the device made on film stretched four times and annealed for 8 h has the best performance. This sensor has good response ability to impact, vibration, and bending strain, and can be applied to human behavior recognition, such as touch, wrist bending, and swallowing.

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Influence of anharmonicity and interlayer interaction on Raman spectra in mono- and few-layer MoS2: A computational study

Cited by 12 publications

References 76 publications

Raman Scattering and Exciton Photoluminescence in Few-Layer GaSe: Thickness- and Temperature-Dependent Behaviors

Raman Scattering and Exciton Photoluminescence in Few-Layer GaSe: Thickness- and Temperature-Dependent Behaviors

Terminal Group‐Oriented Self‐Assembly to Controllably Synthesize a Layer‐by‐Layer SnSe₂ and MXene Heterostructure for Ultrastable Lithium Storage

Skin‐Adhesive Flexible Force Sensors Based on Piezoelectric Poly(l‐lactic acid) for Human Behavior Recognition

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Influence of anharmonicity and interlayer interaction on Raman spectra in mono- and few-layer MoS2: A computational study

Cited by 12 publications

References 76 publications

Raman Scattering and Exciton Photoluminescence in Few-Layer GaSe: Thickness- and Temperature-Dependent Behaviors

Raman Scattering and Exciton Photoluminescence in Few-Layer GaSe: Thickness- and Temperature-Dependent Behaviors

Terminal Group‐Oriented Self‐Assembly to Controllably Synthesize a Layer‐by‐Layer SnSe2 and MXene Heterostructure for Ultrastable Lithium Storage

Skin‐Adhesive Flexible Force Sensors Based on Piezoelectric Poly(l‐lactic acid) for Human Behavior Recognition

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Product

Resources

About

Terminal Group‐Oriented Self‐Assembly to Controllably Synthesize a Layer‐by‐Layer SnSe₂ and MXene Heterostructure for Ultrastable Lithium Storage