Photostability of Monolayer Transition-Metal Dichalcogenides in Ambient Air and Acidic/Basic Aqueous Solutions.

ABSTRACT: We report on the photostability of monolayer (1L) transition-metal dichalcogenides (TMDCs) in air and in aqueous solutions, as probed using photoluminescence spectroscopy. 1L-WSe₂ was readily degraded under continuous irradiation of visible light in aqueous solutions, whereas 1L-MoS₂ was relatively stable in both ambient air and aqueous solutions. The stability difference between these two materials was mainly ascribed to the oxidization reaction at the interface of 1L-TMDCs and the O₂/H₂O redox system induced by both band alignment and photogenerated holes. This interpretation was strongly supported by the observation of the lower degradation rate of 1L-WSe₂ in the dark and in degassed water with a lower concentration of dissolved oxy

SUBMITTER: Zhang W 

PROVIDER: S-EPMC6648714 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature