Tailoring electronic states of nanographenes through heteroatom substitution and substrate interactions
BORIS DOI
Abstract
Technology advances demand new materials for faster and more efficient electronics. Carbon-based nanostructures, particularly planar nanographenes, offer tunable electronic properties through atomic-scale design. This thesis explores different strategies to control these properties in nanographenes synthesized via on-surface synthesis (a bottom-up arrpoach in UHV) and characterized by scanning probe techniques. Three approaches are investigated: geometry and edge structure, heteroatom substitution, and substrate choice. Seventeen-atom-wide graphene nanoribbons are grown and integrated into devices, demonstrating favorable transport behavior. Nitrogen substitution, shown to be compatible with on-surface synthesis, enables doping of the nanographenes but leads to charge transfer to Au(111). To mitigate this effect, TbAu₂ is introduced as a substrate, enabling reduced charging and magnetic coupling. These findings highlight pathways to engineer nanographene electronic properties.
Year of graduation
2025
Theses Type
dissertation
Subject(s)
Keyword(s)
Nanographene
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On-surface synthesis
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Scanning Tunneling Spectrosocpy
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Heteroatom substitution
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Spin
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Ferromagentism
Language(s)
en
Author(s)
Faculty/Graduate School
Institute
EMPA
Related Publications(s)
Access(Rights)
embargo
Primary OA Publication
true