Surface Phonon Dispersion of MoS2
AEROSPACE CORP EL SEGUNDO CA MECHANICS AND MATERIALS TECHNOLOGY CENTER
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The dispersion of phonons on the 0001 surface of MoS2 was measured by high-resolution electron energy loss spectroscopy along both the 010 and 110 azimuths i.e., r to K and r to M respectively. The surface phonons have lower energies than the corresponding bulk phonons, which indicates that the bonding interactions of the surface atoms are different from those of the bulk, even in a layer lattice compound. Since sputtered MOS2 lubricant films are composed of many small crystallites, the relative number of surface atoms in a film is much higher than in a single crystal. The stronger bonding of the surface layer may affect the amount of inter- vs intra-crystalline slip in the lubrication mechanism- This work also demonstrates the use and usefulness of a new technique high-resolution electron energy loss spectroscopy in this laboratory. Molybdenumdisulfide, Electron energy loss spectroscopy, Surface vibrational spectroscopy, Layer-lattice compounds.
- Physical Chemistry
- Solid State Physics