The Synthesis and Nanotribology Study of MS2 Nanotube

Transition metal dichalcogenides MS₂ (M = Mo, W, Nb, Ta) have the lamellar structures similar to graphite. They are often used as solid lubricants in high/low temperature, high load, vacuum, in which oil lubrication is failed. We have synthesized WS₂ nanotubes with decomposition method using Al₂O₃ template. Moreover, chemical vapor transportation reaction is used to produce NbS₂ nanotubes in evacuated and sealed quartz ampoules. Scanning electronic microscope (SEM), transmission electronic microscope (TEM) and X-ray diffraction (XRD) are used to characterize the obtained products. Friction tests of MS₂ nanotubes are carried out on atomic friction microscope (AFM) and pin on disc tester, and it founds that they shows low friction coefficient corresponding to the powder. Finally, their tribological properties and the growth mechanism of nanotubes with different methods are discussed