▎ 摘　　要

Hierarchically stacked graphene oxide (GO) membranes have been observed to undergo physical and chemical changes under ambient conditions. In this study, the slow degradation of GO membranes is mimicked and accelerated by UV light (254 nm) exposure. Spectroscopic and X-ray diffraction analyses confirm that the observed changes, including macroscopic as well as atomic-scale, alterations, cannot be attributed to loss of intercalated water-molecules between the GO sheets, but UV light exposure triggers a partial reduction of the GO membrane to a more graphene-like material.