Surface Phonon Dispersion of MoS2
Abstract
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 intracrystalline 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 31, 1992
- Accession Number
- ADA255835
Entities
People
- P. A. Bertrand
Organizations
- The Aerospace Corporation