Correlation of adhesion force and electrical conductivity in Magnéli-type vanadium oxides and highly oriented pyrolytic graphite

A correlation of adhesion force and electrical conductivity is established for a vanadium oxide and highly oriented pyrolytic graphite (HOPG). Adhesion forces were determined by analysis of pull-off forces obtained from force–distance curves with atomic force microscopy in ultrahigh vacuum, on clean...

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Bibliographic Details
Published in:Surface science 2011-07, Vol.605 (13-14), p.1271-1274
Main Authors: Marwitz, C., Stegemann, B., Breitkreitz, M., Spaltmann, D., Kloss, H., Woydt, M., Sturm, H.
Format: Article
Language:English
Subjects:
Adhesion
Adhesion force
Atomic force microscopy
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Correlation
Cross-disciplinary physics: materials science
rheology
Electrical conductivity
Electrical resistivity
Exact sciences and technology
HOPG
Magnéli phases
Physics
Pyrolytic graphite
Resistivity
Single crystal metals
Single crystals
Vanadium oxide
Vanadium oxides
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Summary:A correlation of adhesion force and electrical conductivity is established for a vanadium oxide and highly oriented pyrolytic graphite (HOPG). Adhesion forces were determined by analysis of pull-off forces obtained from force–distance curves with atomic force microscopy in ultrahigh vacuum, on clean surfaces and with defined contact conditions. The investigated samples include (i) different stoichiometries of Magnéli-type vanadium oxides (V3O5, V4O7, V6O11, and V7O13), which undergo metal-insulator-transitions as a function of temperature, (ii) the (0001) basal plane and the (10–10) prism plane of highly oriented pyrolytic graphite (HOPG), which differ in their respective perpendicular-plane electrical conductivities by several orders of magnitude, and (iii) the (100) surfaces of pure metal single crystals, i.e., silver (Ag), copper (Cu), iron (Fe) and gold (Au). It is shown, that the vanadium oxides as well as the graphite exhibit significantly lower adhesion forces in their electrical conductive state than in their non-electrical conductive state. The values obtained for the electrical conductive states are quantitatively confirmed by the measurements on the single crystal metals. ► Investigation of vanadium oxide and highly oriented pyrolytic graphite (HOPG). ► A correlation of adhesion force and electrical conductivity is established. ► Vanadium oxide and HOPG can exhibit both metallic and non-metallic characteristics. ► The adhesion force is lower in metallic than in non metallic situations. ► These results are supported by subsequent measurements on single crystal metals.
ISSN:0039-6028
1879-2758
DOI:10.1016/j.susc.2011.04.014