TY - GEN A1 - Stegemann, Bert A1 - Backhaus, Henrik A1 - Kloß, Heinz A1 - Santner, Erich ED - Méndez-Vilas, A. ED - J. Diaz, T1 - Spherical AFM Probes for Adhesion Force Measurements on Metal Single Crystals KW - Atomic force microscopy KW - Force distance curves KW - Adhesion force KW - Ultrahigh vacuum KW - Silver KW - Copper KW - Antimony PY - 2007 SN - 978-84-611-9420-9 VL - 2 SP - 820 EP - 827 CY - Badajoz, Spain AN - OPUS4-17400 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Stegemann, Bert A1 - Klemm, M. A1 - Horn, S. A1 - Woydt, Mathias T1 - Switching adhesion forces by crossing the metal-insulator transition in Magnéli-type vanadium oxide crystals N2 - Magnéli-type vanadium oxides form the homologous series VnO2n-1 and exhibit a temperature-induced, reversible metal–insulator first order phase transition (MIT). We studied the change of the adhesion force across the transition temperature between the cleavage planes of various vanadium oxide Magnéli phases (n = 3 ... 7) and spherical titanium atomic force microscope (AFM) tips by systematic force–distance measurements with a variable-temperature AFM under ultrahigh vacuum conditions (UHV). The results show, for all investigated samples, that crossing the transition temperatures leads to a distinct change of the adhesion force. Low adhesion corresponds consistently to the metallic state. Accordingly, the ability to modify the electronic structure of the vanadium Magnéli phases while maintaining composition, stoichiometry and crystallographic integrity, allows for relating frictional and electronic material properties at the nano scale. This behavior makes the vanadium Magnéli phases interesting candidates for technology, e.g., as intelligent devices or coatings where switching of adhesion or friction is desired. KW - Adhesion force KW - Atomic force microscopy KW - Magnéli phases KW - Metal-insulator transition KW - Vanadium oxide PY - 2011 DO - https://doi.org/10.3762/bjnano.2.8 SN - 2190-4286 VL - 2 SP - 59 EP - 65 CY - Frankfurt, M. AN - OPUS4-23155 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -