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- W2050956919 abstract "A valence-force-field model has been used to study the lattice dynamics of molybdenum disulfide single molecular layers. A comparison between the room-temperature Raman spectra of aqueous suspensions and the calculated phonon-dispersion curves for single layers of ${mathrm{MoS}}_{2}$ with trigonal prism and octahedral coordination indicates that ${mathrm{MoS}}_{2}$ single layers adopt a structure in which the Mo atoms are octahedrally coordinated, as opposed to bulk ${mathrm{MoS}}_{2}$ where the trigonal prism coordination is usually found. Besides the zone-center modes, strong Raman peaks have been observed at 156, 226, and 333 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$. The presence of these peaks is attributed to a zone-folding mechanism resulting from the formation of a 2${mathit{a}}_{0}$ifmmodetimeselsetexttimesfi{}${mathit{a}}_{0}$ superlattice in the single layers of ${mathrm{MoS}}_{2}$. The superlattice is, in turn, believed to correspond to the basal-plane atomic arrangement of a distorted octahedral structure. Lattice-dynamics calculations based on an octahedrally coordinated structure with a significant metal-metal interaction yield good agreement with the observed frequencies. When the single molecular layers restack and the sulfur-sulfur interaction between the layers is recovered, the layers convert back to the trigonal prismatic configuration of crystalline ${mathrm{MoS}}_{2}$." @default.
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- W2050956919 date "1991-08-15" @default.
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- W2050956919 title "Raman study and lattice dynamics of single molecular layers 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>" @default.
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- W2050956919 doi "https://doi.org/10.1103/physrevb.44.3955" @default.
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