Spreminjanje lastnosti 2D materialov z molekulsko funkcionalizacijo

This thesis explores the modification of monolayer molybdenum disulfide (MoS$_2$) with the organic molecule 6-(4,5-Dihydro-1$H$-imidazol-3-ium-2-yl)-2-(naphthalene-2-yl)benzothiazole methanesulfonate (L63MS) using a drop-casting method under ambient conditions. Given it’s planar, electron‐delocalized scaffold and bulky sulfonate counterion, L63MS is expected to adsorb via $pi - pi$ stacking, tuning its electronic structure while potentially preventing ordered self‐assembly and passivating the surface. MoS$_2$ samples were synthesized via CVD and characterized using AFM, Raman spectroscopy, and PL spectroscopy to assess the impact of the organic molecule on the structural and opto-electronic properties of the material. The study evaluates the effects of both the solvents used in the drop-casting process and the L63MS molecule itself on MoS$_2$. Results show that the L63MS molecule adsorbs onto the MoS$_2$ surface, inducing measurable changes in the Raman spectra, PL signal, and excitonic properties. These changes suggest potential modifications in doping levels, bandgap, and defect states, all of which are influenced by the choice of solvent in the process. The modification remains stable over time under ambient conditions, and the original optical properties of MoS$_2$ can be restored by heating, indicating the reversibility of the organic molecule's effects. Finally, we demonstrate laser-assisted formation of molecular agglomerates on MoS$_2$ surface at elevated substrate temperatures