Raman and resonance Raman investigation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">MoS</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>nanoparticles

Frey, Gitti L.; Tenne, Reshef; Matthews, Manyalibo J.; Dresselhaus, M. S.; Dresselhaus, G.

doi:10.1103/physrevb.60.2883

Cited by 505 publications

(384 citation statements)

References 39 publications

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“…A prominent peak at ∼227 cm −1 has also previously been reported in literature in deposited MoS 2 films [39] and MoS 2 nanoparticles [40]. Studying MoS 2 nanoparticles, Frey et al [40] attributed the ∼227 cm −1 peak to disorder-induced Raman scattering.…”

Section: Resultsmentioning

confidence: 69%

“…Studying MoS 2 nanoparticles, Frey et al [40] attributed the ∼227 cm −1 peak to disorder-induced Raman scattering. This peak has been linked to the presence of a local maximum in the vibrational density of states (VDOS), located at the energy corresponding to the longitudinal acoustic (LA) branch at the edge of the Brillouin zone [35] [ Fig.…”

Section: Resultsmentioning

confidence: 99%

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Effect of disorder on Raman scattering of single-layerMoS2

et al. 2015

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We determine the effect of defects induced by ion bombardment on the Raman spectrum of single-layer molybdenum disulfide. The evolution of both the linewidths and frequency shifts of the first-order Raman bands with the density of defects is explained with a phonon confinement model, using density functional theory to calculate the phonon dispersion curves. We identify several defect-induced Raman scattering peaks arising from zone-edge phonon modes. Among these, the most prominent is the LA(M) peak at ∼227 cm −1 and its intensity, relative to the one of first-order Raman bands, is found to be proportional to the density of defects. These results provide a practical route to quantify defects in single-layer MoS 2 using Raman spectroscopy and highlight an analogy between the LA(M) peak in MoS 2 and the D peak in graphene.

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Section: Resultsmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Effect of disorder on Raman scattering of single-layerMoS2

et al. 2015

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“…The asymmetric 2LA(M) peak is associated with second-order zoneedge phonon (LA(M)) and a first order optical phonon peak (A 2u ). [55][56][57][58] These results along with electron microscopy results suggests that the structure is relatively undistorted MoS 2 . [59][60] Further, X-ray diffraction analysis (XRD) of MoS 2 -raw and MoS 2 -SA in Fig.…”

Section: Resultsmentioning

confidence: 75%

MoS₂/Graphene Composite Paper for Sodium-Ion Battery Electrodes

2014

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We study the synthesis, electrochemical and mechanical performance of layered freestanding papers composed of acid exfoliated few layer molybdenum disulfide (MoS 2 ) and reduced graphene oxide (rGO) flakes for use as a self-standing flexible electrode in sodium ion batteries. Synthesis was achieved through vacuum filtration of homogenous dispersions consisting of varying wt. % of acid treated MoS 2 flakes in GO in DI water, followed by thermal reduction at elevated temperatures. The electrochemical performance of the crumpled composite paper (at 4 mg.cm -2 ) was evaluated as counter electrode against pure Na foil in a half-cell configuration. The electrode showed good Na cycling ability with a stable charge capacity of approx.230 mAh.g -1 with respect to total weight of the electrode with coulombic efficiency reaching approx. 99 %. In addition, static uniaxial tensile tests performed on crumpled composite papers showed high average strain to failure reaching approx. %.KEYWORDS: TMDC, sodium battery, freestanding electrode, graphene, MoS 2 2 Lithium ion batteries (LIBs) have been extensively studied for energy-storage applications like portable electronic devices and electric vehicles. [1][2][3] However, concerns over the cost, safety and availability of Li reserves 4 for large-scale applications involving renewable energy integration and the electrical grid have to be answered. In this regard, sodium ion batteries (SIBs) have drawn increasing attention because in contrast to lithium, 5-7 sodium resources are practically inexhaustible and evenly distributed around the world while the ion insertion chemistry is largely identical to that of lithium. Also, from electrochemical point of view, sodium has a very negative redox potential (-2.71 V, vs. SHE) and a small electrochemical equivalent (0.86 gAh -1 ), which make it the most advantageous element for battery applications after lithium. However, many challenges remain before SIBs can become commercially competitive with LIBs. For instance, Na ions are about 55% larger in radius than Li-ions, which makes it difficult to find a suitable host material to allow reversible and rapid ion insertion and extraction. 8 To this end, researchers have proposed a number of high-capacity sodium host materials (negative electrode) involving either carbon or group IVA and VA elements that form intermetallic compounds with Na. [9][10][11][12][13] The alloying compounds demonstrate high first cycle Na-storage capacities, such as Na 15 Sn 4 (847 mAhg -1 ), Na 15 Pb 4 (485 mAhg -1 ), Na 3 Sb (600 mAhg -1 ) and Na 3 P (2560 mAhg -1 ), respectively. However, this comes at the cost of very high volume change upon Na-insertion (as much as 500 % in some cases), resulting in formation of internal cracks, loss of electrical contact, and eventual failure of the electrode (particularly for thick electrodes). 14 Novel nanostructured designs that can accommodate large volumetric strains need further exploration. [15][16][17][18] For carbon-based electrode materials, much of the emphasis ...

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“…As expected all modes experience a red shift for tensile strain, with a shift rate of ≈ −2.2 cm −1 /% for the A 1g mode and ≈ −5.2 cm −1 /% for the E 2g mode, respectively. Assuming that the Raman E 2g mode shows almost no dependence on doping 20,21 , the observed downshift mode would correspond to biaxial tensile strain of ǫ ≈ 0.4%.…”

Section: A Freestanding Few-layer Mos2mentioning

confidence: 99%

Photoluminescence of freestanding single- and few-layerMoS2

et al. 2014

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We present a photoluminescence study of freestanding and Si/SiO2 supported single-and few-layer MoS2. The single-layer exciton peak (A) is only observed in freestanding MoS2. The photoluminescence of supported single-layer MoS2 is instead originating from the A − (trion) peak as the MoS2 is n-type doped from the substrate. In bilayer MoS2, the van der Waals interaction with the substrate is decreasing the indirect band gap energy by up to ≈ 80 meV. Furthermore, the photoluminescence spectra of suspended MoS2 can be influenced by interference effects.

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Raman and resonance Raman investigation ofMoS2nanoparticles

Cited by 505 publications

References 39 publications

Effect of disorder on Raman scattering of single-layerMoS2

Effect of disorder on Raman scattering of single-layerMoS2

MoS₂/Graphene Composite Paper for Sodium-Ion Battery Electrodes

Photoluminescence of freestanding single- and few-layerMoS2

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Raman and resonance Raman investigation ofMoS2nanoparticles

Cited by 505 publications

References 39 publications

Effect of disorder on Raman scattering of single-layerMoS2

Effect of disorder on Raman scattering of single-layerMoS2

MoS2/Graphene Composite Paper for Sodium-Ion Battery Electrodes

Photoluminescence of freestanding single- and few-layerMoS2

Contact Info

Product

Resources

About

MoS₂/Graphene Composite Paper for Sodium-Ion Battery Electrodes