Fluorinated Diamond Thin Films for Tribological Applications
Abstract
Diamond (100) substrates have been fluorinated with both atomic and molecular fluorine under ultrahigh vacuum conditions using molecular beams. X- ray photoelectron spectra of the resulting samples indicate that atomic fluorine, F, reacts with an initial accommodation coefficient of 0.25 (+ or - 0. 1) at 298 K; a saturation coverage of about three quarters of a monolayer is obtained. The carbon fluoride adlayer is thermally stable to 700 K, but slowly desorbs at temperatures above this. In contrast, molecular fluorine, F2, reacts quite slowly; a saturation coverage of less than one fifth of a monolayer after several hundred monolayers exposure to F2 at temperatures from 300 K to 700 K is achieved. In addition, diamond substrates saturated with fluorine atoms showed no loss of fluorine after exposure to beams of H2 and O2 at temperatures between 300 K and 700 K. Keywords: Diamond thin films; Fluorination; Tribology.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 04, 1990
- Accession Number
- ADA217452
Entities
People
- Andrew Freedman
- Charter Stinespring
Organizations
- Aerodyne Research