Bottom-up synthesis of nanographene structures for optoelectronic applications (anglais)

Graphene is a 2D material with excellent optical properties and has attracted the interest of the scientific community since its discovery. However, its lack of band gaps limits its applications in optics and optoelectronics. Various methods have been proposed to create a bandgap. There are two approaches to producing nanographenes: the top-down approach and the bottom-up approach. However, these materials may have limitations in certain applications due to significant aggregation and limited solubility in organic solvents. The first part of this thesis is dedicated to the synthesis of a family of graphene nanoparticles soluble in organic solvents, thanks to the integration of additional bulky functional groups. Despite good solubility, this did not allow for a better understanding of the intrinsic optical properties of these molecules. In the second part, we modified the structure of these graphene nanoparticles to create “platform” molecules. These new families of nanoparticles have been used for post-functionalization reactions, such as palladium-catalyzed coupling reactions. The final part focuses on the synthesis of graphene nanomesh precursors. For this, we synthesized different precursors to produce nanomeshes through lateral fusion and direct coupling on metallic surfaces.