Coadsorption of K and O 2 on MoS 2(0001)

Abstract

The coadsorption of K and O 2 on MoS 2(0001) at RT, has been investigated by LEED, AES, TDS and WF measurements. The sticking coefficient and the maximum amount of oxygen on the surface increase with K coverage. For θ K > 0.5 the amount of desorbed oxygen increases almost linearly with θ K . The oxygen interacts strongly with K and forms K-O complexes on the surface of MoS 2. The TD spectra show K 2O 2, K 2O and KO 2. The interaction of the adsorbed oxygen with K causes the diffusion of intercalated K to the surface (deintercalation). The deintercalation of K to the surface helps estimating the coverage of K on MoS 2