Elasticity, wear, and friction properties of thin organic films observed with atomic force microscopy

  • R. M. Overney
    Institute of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
  • T. Bonner
    Institute of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
  • E. Meyer
    Institute of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
  • M. Rüetschi
    Institute of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
  • R. Lüthi
    Institute of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
  • L. Howald
    Institute of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
  • J. Frommer
    Institute of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
  • H.-J. Güntherodt
    Institute of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
  • M. Fujihira
    Department of Bimolecular Engineering, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan
  • H. Takano
    Department of Bimolecular Engineering, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan

Abstract

<jats:p>An atomic force microscopy study is presented on lubricating systems, such as thin organic Langmuir–Blodgett films. Local elastic compliance was measured simultaneously with topography and friction on thin films of mixtures of fluorocarbons and hydrocarbons. On the phase-separated fluorocarbon domains, higher friction and lower Young’s modulus than on the hydrocarbon domains was found. Adhesive wear has been observed to occur randomly on the stiffer hydrocarbon domains if the film is complexed with a counterion polymer of a larger cross-sectional area. A quantitative fractal analysis of the hydrocarbon film remaining areas provided a linear adhesive wear dependence on the scan cycle number.</jats:p>

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