By: Matěj Velický - Department of Electrochemical Materials - J. Heyrovský Institute of Physical Chemistry, Czech Academy of Sciences
When: June, 24 - 4PM
Where: Salón de Actos, ICMM
Abstract: Strong interactions between 2D materials and gold have attracted wide interest recently, leading to a reliable production of large-area monolayers of different 2D materials, in particular MoS2 and other transition metal dichalcogenides. MoS2 monolayers exfoliated on gold exhibit strong charge transfer, interfacial stress, and other phenomena, observable by optical spectroscopy, photoemission electron spectroscopy, and electrochemistry. Other metals should theoretically exhibit even stronger interaction with MoS2 than Au, however, experimental observations suggest that their susceptibility to oxidation prevents it in air-prepared samples.
We recently succeeded in exfoliating monolayer MoS2 on a range of different metals under an inert atmosphere and characterized the resulting monolayers using different techniques, in particular Raman spectroscopy and X-ray photoelectron spectroscopy. The positions, shapes, and intensities of the main E and A1 Raman vibration modes of MoS2 show significant changes on different metals. We rationalize these results based on differences between the MoS2 and metal work functions, morphology, and the extent of hybridization.
