Effects of Argon-Ion Bombardment on the Basal Plan Surface of MoS2

摘要

The surface composition and structure of the basal plane surface of Molybdenum Disulfide was modified by 10 keV argon-ion bombardment and then studied with x-ray photoelectron spectroscopy. The rigid shift of both sulfur and molybdenum core levels is demonstrated to result from the formation of a small amount of Molybdenum islands on the surface, although there is no a priori evidence for changes in oxidation state at the surface after bombardment. This conclusion is suggested by recent data on the deposition of metals on the MoS2 basal plane that indicate a strong correlation between the Mo or sulfur binding energy and the electronegativity of the metal. Our results are compared with those of previous studies and are explained in terms of recent theories on the effects of surface ion bombardment that suggest that chemical/thermal effects dominate over substrate mass effects for higher projectile-ion mass and energy.