Química Analítica Farmacêutica: Acesso Aberto

Química Analítica Farmacêutica: Acesso Aberto
Acesso livre

ISSN: 2471-2698


Flight of Charges

Sathish Tanneru

X-ray and ultraviolet photoelectron spectroscopy are performed on transition metal dichalcogenides (TMDs) MoS2, MoSe2, and MoTe2 monolayers on Au surfaces, to spot charge transfer processes and changes in structural phase upon annealing up to 500 °C. Although charge transfer does appear to occur because the spacing between the TMD monolayer and therefore the Au surface decreases, we don't find spectroscopic evidence for the 2H to 1T phase change in exfoliated TMDs. Both metal–organic chemical vapor deposition grown and helium-ion irradiated exfoliated-TMDs annealed on Au surfaces show shifts in their spectra that would be interpreted as a phase transition, but are the results of TMD/Au hybridization, grain boundaries and defects interacting with the Au surface.