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A. Tomala, I. Gebeshuber, M. Roy, A. Pauschitz, T. Polcar, A. Cavaleiro:
"A comparative AFM study of carbon alloyed Mo-Se-C and W-S-C films for tribological applications";
Vortrag: 35th Leeds-Lyon Symposium on Tribology, Trinity and All Saints College, The University of Leeds/UK; 11.09.2008; in: "Book of Abstracts, 35th Leeds-Lyon Symposium on Tribology, Duncan Dowson AT 80", (2008), S. paper XXI (iii).

Transition metal dichalcogenides have layered structure and are therefore promising self lubricating films. They can be considered as potential substitutes for carbon based films in various environmental conditions. In this work, a comparative atomic force microscopy study of co-sputtered Mo-Se-C and W-S-C films is performed. Both films are alloyed at approximately 55% carbon. The microstructural features of these films are characterised using scanning electron microscopy and x-ray diffraction. The topography, friction forces and pull off forces of the films are evaluated by means of atomic force microscopy and spectroscopy. The results show that the roughness parameters of Mo-Se-C film are lower than that of W-S-C films at high carbon content whereas the reverse is true at low carbon content. Adhesion forces of these films based on pull-off force measurements show that Mo-Se-C films have higher pull off forces than W-S-C films. An AFM technique is developed to estimate microscopic values of friction coefficients and to characterise the nature of surface changes due to nanotribological experiments. The friction force and friction coefficients of Mo-Se-C films are higher than that of W-S-C films at low carbon content and these friction coefficients are comparable at high carbon content.