Speaker: Jimmy Kotsakidis, Ph.D. Student at Monash University, Physics Dept., Australia
Title: Fundamental Experimental Studies on the Oxidation of Monolayer WS2 and Intercalation of Graphene on Silicon Carbide with the Alkali Earths
Abstract: This talk will cover experiments on the 2D materials WS2 and graphene. We have examined the ambient oxidation of monolayer WS2, finding that oxidation proceeds via a photoexcitation induced (photo-oxidation) pathway requiring absorbed light at or above the trion energy. Significant oxidation occurs for WS2 exposed to laboratory lights for weeks, or a single typical photoluminescence map though is prevented for WS2 stored in darkness. I will also present findings from STM and Synchrotron XPS studies on the intercalation of mono and bilayer graphene on SiC with magnesium and calcium.