Quartz Crystal Microbalance Studies of Atomic Scale Friction of Krypton on Graphene
No Thumbnail Available
Files
Date
2006-08-21
Authors
Advisors
Journal Title
Series/Report No.
Journal ISSN
Volume Title
Publisher
Abstract
The Quartz Crystal Microbalance (QCM) had been used to record adsorption and sliding friction data for molecularly thin krypton films, at 77K, on surfaces of single graphite layer (graphene) prepared under Ultra High Vacuum (UHV). Iron and nickel electrodes carbonized by reaction with CO at temperatures of about 375oC and 400oC respectively to produce graphene present varying surface quality. Adsorption isotherms of krypton were studied on graphene surfaces grown on iron, nickel and gold/nickel substrates. These have different lattice spacing. The adsorptions of krypton produce responses in the QCM mechanical properties that may be used to determine the formation of a monolayer adsorbate. At 77K, the krypton is known to adsorb on graphite surfaces forming two-dimensional phases which are in many respects, quite similar to the solid-gas phases encountered in the three-dimensional (bulk) substances. This work utilizes the static phase diagrams of such two-dimensional phases, in comparison to the dynamic phase change, to investigate the temperature rise at the sliding interface as a function of the sliding speed of the adsorbed krypton layer. The QCM data on graphene/nickel suggest that the temperature change of about 10K at the interface irrespective of the sliding velocity. Auger Electron Spectroscopy (AES) is used to determine the quality of surfaces.
Description
Keywords
quartz crystal microbalance, graphene, friction
Citation
Degree
PhD
Discipline
Physics
