Synthesis of nanocomposite thin films with self-assembled structures by pulsed ion beam ablation of MoS₂ target

Nanocomposite films with unusual structures were synthesized by ablating a molybdenum disulfide target with pulsed intense ion beams and depositing the films on substrates kept at 573 K. Microstructure of the films was comprised of 10-100 nm size pure molybdenum boulders in an amorphous matrix of Mo and S, instead of a single homogeneous phase. Tribological studies indicate that frictional contact during the initial run-in period can transform the amorphous matrix into crystalline MoS₂ with basal planes oriented along the direction of sliding. The films appear to have potential for low friction and low wear applications in harsh environments.