二硫化モリブデン結晶中への水素拡散の観察

Abstract

Permeation of hydrogen into the molybdenum disulfide crystal (MoS2) in the hydrogen atmosphere is investigated from a view point of gas release by cleavage. MoS2 crystals are exposed to H2 or D2 gas at temperatures between RT and 600°C, followed by the cleavage at the same temperatures after evacuation of H2 or D2 gas. The dependence of amount of outgassing on the exposed temperature shows similar tendency in H2 and D2 except maximum outgassing temperature. The concentration of hydrogen in the bulk increases at the temperature of 400 or 500°C due to permeation from the surface to the bulk. Beyond the temperatures the concentration in the bulk decreases due to thermal desorption. Regardless of the exposure to D2 gas, many D atoms are detected. The concentration of dissociated hydrogen atoms in MoS2 depends on the exposure temperatures.