<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "N-Heteropolycycles on graphene: Supramolecular\r\norganization and charge transfer"^^ . "This work aims at a more detailed understanding of non-covalent doping of graphene\r\nand Molybdenumdisulfide using aromatic N-heteropolycycles. Therefore a wide variety\r\nof molecules is first deposited via wet-deposition onto graphene, to then investigate the\r\ninduced changes in Fermi energy of graphene with both Raman spectroscopy and Kelvin-Probe-Force Microscopy. The induced shifts in graphene are then correlated with both\r\nthe molecular geometry and substituents, as well as their electronic properties to derive a\r\nstructure-effect relation that can be used to guide the fine tuning of graphene’s electronic\r\nand surface properties.\r\nAll methods in this work, form deposition to measurements are done under ambient\r\nconditions to mimic the conditions of real live applications and to avoid perfect lab conditions like ultra-high vacuum that are not viable for end-of-the line device production\r\nand use. This idea is also applied to the graphene that is used itself, as commercially\r\navailable graphene was used for all experiments.\r\nWith this framework in mind the first steps of this project were to establish a suitable\r\nsample preparation routine to achieve a reproducible and comparable graphene substrate\r\nfor the subsequent measurements. Due to CVD-grown and wet-transferred graphene being contaminated with polymer residues and water this was a crucial step for reliable\r\nresults in the end. Comparing a wide range of different molecules, it was also necessary\r\nand important to formulate a deposition procedure that can be applied to all molecules,\r\nalthough probably not optimized for the specific molecule it was optimized for the overall\r\ncomparison of all molecules on even ground.\r\nThe first results of the deposition of both TIPS-Tetraazapentacenes and Tetraazaperopyrenes show a strong dependence of the graphene doping on the acceptor strength\r\n(=LUMO energy) of the molecules and less on the overall molecular structure (i.e. substituents and substitutional patterns).\r\nWith those established protocols and findings the relations of charge transfer interaction\r\nbetween molecules and graphene were further refined with additional acceptor molecules\r\n(Benzonapthyridines) and also demonstrated for the opposite interaction with donor-type\r\nHeterotriangulenes showing trends in-line with the theory.\r\ni\r\nIn case of the Benzonaphthyridines and Heterotriangulenes the graphene modification\r\nwas carried a step further by utilizing the molecule specific properties of possible protonation with common acids and oxidation via UV irradiation to introduce a second stage\r\nof charge transfer after initial deposition. This demonstrated that it is possible to further\r\nmodify already assembled molecules on graphene (and as a consequence the Fermi level\r\nof graphene as well) without major damage to graphene itself, although in our cases the\r\noverall changes following the second modification were small, but could easily be increased\r\nwith specific molecules engineered for those kinds of applications.\r\nTo delve even further into the non-covalent nanomaterial doping all, the gained insights\r\nand experiences from graphene were then taken to Molybdenumdisulfide (MoS2) to see\r\nwhether the rules of structure-effect-relations derived from graphene can be applied to a\r\ndifferent class of nanomaterial and to see specific differences and whether they follow the\r\ntheoretical expectations. With the self-assembly of molecules being guided by mainly π-π\r\ninteractions on graphene, MoS2 shows that the acceptor strength is one of the driving\r\nfactors not only for the electronic modification but also for the deposition itself."^^ . "2022" . . . . . . . "Maximilian"^^ . "Krings"^^ . "Maximilian Krings"^^ . . . . . . "N-Heteropolycycles on graphene: Supramolecular\r\norganization and charge transfer (PDF)"^^ . . . "Dissertation_Maximilian Krings.pdf"^^ . . . "N-Heteropolycycles on graphene: Supramolecular\r\norganization and charge transfer (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "N-Heteropolycycles on graphene: Supramolecular\r\norganization and charge transfer (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "N-Heteropolycycles on graphene: Supramolecular\r\norganization and charge transfer (Other)"^^ . . . . . . "preview.jpg"^^ . . . "N-Heteropolycycles on graphene: Supramolecular\r\norganization and charge transfer (Other)"^^ . . . . . . "medium.jpg"^^ . . . "N-Heteropolycycles on graphene: Supramolecular\r\norganization and charge transfer (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #32089 \n\nN-Heteropolycycles on graphene: Supramolecular \norganization and charge transfer\n\n" . "text/html" . . . "540 Chemie"@de . "540 Chemistry and allied sciences"@en . .