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      Nanomechanics using an ultra-small amplitude AFM

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      Author(s)
      Hoffmann, P. M.
      Jeffery, S.
      Oral, Ahmet
      Grimble, R. A.
      Özer, H. Özgür
      Pethica, J. B.
      Date
      2001
      Source Title
      Materials Research Society Symposium: Symposium Q–Fundamentals of Nanoindentation & Nanotribology
      Print ISSN
      0272-9172
      Publisher
      Cambridge University Press
      Volume
      649
      Pages
      1 - 6
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      Abstract
      A new type of AFM is presented which allows for direct measurements of nanomechanical properties in ultra-high vacuum and liquid environments. The AFM is also capable to atomic-scale imaging of force gradients. This is achieved by vibrating a stiff lever at very small amplitudes of less than 1 Å (peak-to-peak) at a sub-resonance amplitude. This linearizes the measurement and makes the interpretation of the data straight-forward. At the atomic scale, interaction force gradients are measured which are consistent with the observation of single atomic bonds. Also, atomic scale damping is observed which rapidly rises with the tip-sample separation. A mechanism is proposed to explain this damping in terms of atomic relaxation in the tip. We also present recent results in water where we were able to measure the mechanical response due to the molecular ordering of water close to an atomically flat surface.
      Keywords
      Chemical bonds
      Damping
      Nanostructured materials
      Relaxation processes
      Stiffness
      Vibrations (mechanical)
      Atomic relaxation
      Atomic scale imaging
      Nanomechanics
      Atomic force microscopy
      Permalink
      http://hdl.handle.net/11693/27622
      Published Version (Please cite this version)
      https://doi.org/10.1557/PROC-649-Q9.2
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      • Department of Physics 2485
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