Surface scattering dynamics of graphene and graphite

Meyer, Sven

dc.contributor.advisor	Wodtke, Alec M. Prof. Dr.
dc.contributor.author	Meyer, Sven
dc.date.accessioned	2022-04-26T11:34:26Z
dc.date.available	2022-05-03T00:50:11Z
dc.date.issued	2022-04-26
dc.identifier.uri	http://resolver.sub.uni-goettingen.de/purl?ediss-11858/14008
dc.identifier.uri	http://dx.doi.org/10.53846/goediss-9197
dc.language.iso	eng	de
dc.subject.ddc	540	de
dc.title	Surface scattering dynamics of graphene and graphite	de
dc.type	doctoralThesis	de
dc.contributor.referee	Wodtke, Alec M. Prof. Dr.
dc.date.examination	2022-03-15	de
dc.description.abstracteng	Since its first successful preparation in 2004, graphene has been extensively studied because of its outstanding mechanical, thermal and electronic properties. Graphene is an especially interesting material because of its zero-bandgap electronic structure, which puts it right on the edge between metals and semiconductors. Up to this point, non-adiabatic interactions have only been observed on metal surfaces. In this work, vibrational excitation of NO was investigated as a probe for non-adiabatic interactions by scattering a molecular beam of NO from epitaxial graphene on Pt(111) (Gr/Pt) and highly oriented pyrolytic graphite (HOPG). No signs of non-adiabatic interactions were found. Instead, thermal vibrational excitation of NO was observed on Gr/Pt as a result of a trapping-desorption scattering mechanism, which is supported by state to state time of flight measurements. In contrast, on HOPG only direct scattering without vibrational excitation has been observed. Further state to state time of flight experiments revealed a very efficient coupling between the surface and the kinetic energy of the NO, resulting in a high translational energy loss of up to 80% for Gr/Pt, and up to 66% for HOPG. An enhanced sticking probability of NO on graphene compared to HOPG was observed that could be modeled using detailed balance. This enhanced sticking probability makes graphene an interesting substrate for catalysts, where it can act as a net to catch the reactands.	de
dc.contributor.coReferee	Suhm, Martin A. Prof. Dr.
dc.contributor.thirdReferee	Troe, Jürgen Prof. Dr.
dc.contributor.thirdReferee	Kitsopoulos, Theofanis N. Prof. Dr.
dc.contributor.thirdReferee	Schwarzer, Dirk Prof. Dr.
dc.contributor.thirdReferee	Steil, Daniel Dr.
dc.subject.eng	Dynamics at surfaces	de
dc.subject.eng	Molecular beam surface scattering	de
dc.subject.eng	REMPI spectroscopy	de
dc.subject.eng	Energy transfer	de
dc.subject.eng	Detailed balance	de
dc.subject.eng	Vibrationally excited NO	de
dc.subject.eng	vibrational relaxation	de
dc.subject.eng	Graphene	de
dc.identifier.urn	urn:nbn:de:gbv:7-ediss-14008-2
dc.affiliation.institute	Fakultät für Chemie	de
dc.subject.gokfull	Chemie (PPN62138352X)	de
dc.description.embargoed	2022-05-03	de
dc.identifier.ppn	1800458061

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