| AVS 60th International Symposium and Exhibition | |
| Tribology Focus Topic | Monday Sessions |
| Session TR+AS+NS+SS-MoA |
| Session: | Molecular Origins of Friction |
| Presenter: | M.Z. Baykara, Bilkent University, Turkey |
| Authors: | M.Z. Baykara, Bilkent University, Turkey C. Ritter, Humboldt Universitat zu Berlin, Germany B. Stegemann, HTW Berlin – University of Applied Sciences, Germany M. Heyde, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Germany K. Rademann, Humboldt Universität zu Berlin, Germany J. Schroers, Yale University U.D. Schwarz, Yale University |
| Correspondent: | Click to Email |
We present frictional measurements involving controlled lateral manipulation of antimony nanoparticles on graphite featuring atomically smooth particle-substrate interfaces via tapping- and contact-mode atomic force microscopy. As expected from earlier studies, the power required for lateral manipulation as well as the frictional forces recorded during the manipulation events exhibit a linear dependence on contact area over a wide size range from 2000 nm2 to 120,000 nm2. However, we observe a significant and abrupt increase in frictional force and dissipated power per contact area at a value of about 20,000 nm2, coinciding with a phase transition from amorphous to crystalline within the antimony particles. Our results suggest that variations in the structural arrangement and stoichiometry of antimony oxide at the interface between the particles and the substrate may be responsible for the observed effect.