Chemical Interaction of Mn with the MoS(2) (0001) Surface Studied by High-Resolution Photoelectron Spectroscopy
Abstract
The interaction of transition metals with MoS2 surfaces has been increasingly studied recently with respect to applications in catalysis, electronic materials, and tribology (lubrication). The interface produced by vapor deposition of Manganese on the Molybdenum disulfide (0001) surface was studied in situ by high-resolution photoelectron spectroscopy (PES) using synchrotron radiation. The evolution of the Mo-3d, Mn-3p, and S-2p core levels and of the valence band spectra during growth of thin films is consistent with partial conversion of the Mn overlayer to MnS by the overall reaction 2Mn + MoS2 yields 2MnS + Mo. the persistence of the substrate components of the M0-3d and S-2p spectra for thicknesses >35 A are consistent with the Volmer-Weber groth mode. Annealing a 58 A film to 770 K resulted in an overlayer film consisting mostly of MnS coexisting with some metallic Mn. Analysis of the Mo-3d core levels indicates the production of a MoS2(001) surface with vacancy defects. Annealing to temperatures between 850 and 1040 K drove the reaction to completion (as shown by the valence band and Mn-3p core level spectra). Annealing of the sample to 1130 K resulted in uncovering the M<oS2(0001) surface due to breakup of the reacted layer. In addition, low energy electron diffraction (LEED) indicated the formation of (0001)-2x2 regions on the surface. This surface structure is interpreted in terms of ordered MoS (2-x) sulfur vacancy defect structure rather than a Mn-Mo-S compound. Keywords: Solid lubrication; Metal/semiconductor interfaces.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 08, 1989
- Accession Number
- ADA212811
Entities
People
- Amina Taleb-ibrahimi
- Jeffrey R. Lince
- Jory A . Yarmoff
- Paul D. Fleishchauer
- Thomas B. Stewart
Organizations
- The Aerospace Corporation