Writing in RSC Advances, a team from Hangzhou Dianzi University led by Weitao Su demonstrates a fast and easy way in order to improve the photoluminescence yield of monolayer molybdenum disulfide. The methodology begins with the typical micro mechanical exfoliation of atomically thin layers of MoS2, which are subsequently deposited on oxidized silicon substrate. Monolayer are identified through a combination of optical and Raman spectroscopy. The samples are process in order to increase their photoluminescence.
The technique involves coating the substrate and flakes with a layer of hydrogen peroxide and toluene. This improves the photoluminescence in MoS2 by up to 30x times, a quite remarkable improvement.
Further reading “Tuning Photoluminescence of single-layer MoS2 using H2O2” Su et al, RSC Advances