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001048442 0247_ $$2doi$$a10.18154/RWTH-2025-07835
001048442 037__ $$aFZJ-2025-04648
001048442 041__ $$aEnglish
001048442 1001_ $$0P:(DE-Juel1)164856$$aYin, Hao$$b0$$eCorresponding author
001048442 245__ $$aInvestigation of 2D materials using low energy electron microscopy (LEEM)$$f - 2025-05-22
001048442 260__ $$bRWTH Aachen University$$c2025
001048442 300__ $$apages 1 Online-Ressource : Illustrationen
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001048442 3367_ $$02$$2EndNote$$aThesis
001048442 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1764068068_22515
001048442 3367_ $$2DRIVER$$adoctoralThesis
001048442 502__ $$aDissertation, RWTH Aachen, 2025$$bDissertation$$cRWTH Aachen$$d2025
001048442 520__ $$aLow-energy electron microscopy (LEEM) is a versatile and powerful surface science tool for imaging, structural analysis and the study of kinetic surface processes such as molecular island growth, thin film growth and surface reconstruction. It uses electrons with kinetic energies below a few hundred electronvolts, often below 10 eV. In this thesis, LEEM serves as the main technique to support our research efforts in fabricating 30◦-twisted bilayer graphene (TBG) and in studying the deposition and degradation behavior of a cyclic, tire-shaped molecules on a metal crystal. The first two topics of this thesis build on previous work from our group that demonstrated the epitaxial growth of unconventionally oriented monolayer graphene on a 6H-SiC(0001) substrate. In the first topic, LEEM and other investigation methods were used to characterize the morphology and electronic properties of such unconventionally oriented monolayer graphene. The effect of the preparation temperature on the resulting graphene sample was highlighted. In the second topic, we achieved and studied bilayer stacking and twist configurations of graphene by hydrogen intercalation of the carbon buffer layer, an intrinsic component between the epitaxial graphene and the SiC substrate. Hydrogen atoms were successfully introduced to decouple the buffer layer from the substrate. The buffer layer was transformed into a true graphene layer with distinct π-band properties. This intercalation process was carried out in a stepwise manner, with LEEM being used to study each step. The deintercalation process was monitored in situ and in real time. This provided deeper insights into the mechanisms of hydrogen intercalation and deintercalation. In the third topic of the thesis, the deposition behavior of a carbon-based cyclic aromatic molecule, [6]-cycloparaphenylenes, is investigated using LEEM in addition to pristine 2D graphene layers. Interestingly, our observations contradict previous results obtained by scanning tunneling microscopy. This provides new insights into the deposition behavior of this type of molecules on surfaces.
001048442 536__ $$0G:(DE-HGF)POF4-5213$$a5213 - Quantum Nanoscience (POF4-521)$$cPOF4-521$$fPOF IV$$x0
001048442 588__ $$aDataset connected to DataCite
001048442 650_7 $$2Other$$aHochschulschrift
001048442 650_7 $$2Other$$atwisted bilayer graphene (TBG) ; unconventionally oriented epitaxial graphene ; low energy electron microscopy (LEEM) ; hydrogene intercalation
001048442 7001_ $$0P:(DE-Juel1)128774$$aKumpf, Christian$$b1$$eSupervisor
001048442 7001_ $$0P:(DE-Juel1)130824$$aMayer, Joachim$$b2$$eSupervisor
001048442 773__ $$a10.18154/RWTH-2025-07835
001048442 8564_ $$uhttps://publications.rwth-aachen.de/record/1018412
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001048442 9141_ $$y2025
001048442 920__ $$lyes
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