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DS: Fachverband Dünne Schichten
DS 35: Poster I: Application of thin films; Focus session: Sensoric micro and nano-systems; Focus Session: Sustainable photovoltaics with earth abundant materials; Graphen (joint session with TT; MA; HL; DY; O); Ion and electron beam induced processes; Layer properties: electrical, optical, and mechanical properties; Magnetic/organic interfaces, spins in organics and molecular magnetism; Micro- and nanopatterning (jointly with O); Organic electronics and photovoltaics (jointly with CPP, HL, O); Thermoelectric materials
DS 35.21: Poster
Mittwoch, 2. April 2014, 17:00–20:00, P1
Nanomechanics of carbon nanotube-metal contacts investigated by molecular dynamics and validating experiments — •Steffen Hartmann1, Ole Hölck2, Sascha Hermann1, Thomas Blaudeck1, Stefan E. Schulz1, Thomas Gessner1, and Bernhard Wunderle1 — 1TU Chemnitz, Sachsen, Germany — 2Fraunhofer IZM, Berlin, Germany
With this contribution we present our recent progress in understanding the mechanics of carbon nanotube-metal interfaces at the nano scale. A detailed understanding of the behaviour of a mechanically stressed CNT inside a metal support is of fundamental importance for thermo mechanical reliability predictions and failure-mechanistic treatment of future CNT devices. A simple test to study the reaction behavior of CNTs inside a metal support is the pull-out test. We simulated this pull-out test with molecular dynamics and varying parameters and conducted in-situ pull-out tests inside a scanning electron microscope. From our simulations we find that the ideal incommensurate interface between the lattices of chiral CNTs and metals leads to a behaviour that is independent on embedding length. On the other hand the CNT diameter is of significant importance. We report on predicted pull-out forces which were determined to be in the nN range. Further we explain the influence of defects on the pull-out forces. The results from our experiments are maximum forces between 20 and 35 nN. We compare our experimental findings with results of our numerical investigations and give interpretations for deviations according to material impurities or defects and their influence on the pull-out data.