Towards Self-Standing Graphane: Atomic Hydrogen and Deuterium Bonding to Nano-Porous Graphene

Proponente Carlo Mariani - Professore Ordinario
Sottosettore ERC del proponente del progetto
Componenti gruppo di ricerca
Componente Categoria
Maria Grazia Betti Componenti strutturati del gruppo di ricerca
Francesco Trequattrini Componenti strutturati del gruppo di ricerca

There is a growing interest in functionalizing graphene (Gr), the prototype one-atom-thick two-dimensional (2D) material, in order to obtain a semiconducting 2D material with the excellent mechanical and morphological properties of graphene. A fully hydrogenated graphene mesh is called "graphane" and it is predicted to present an energy gap above 3.5 eV, maintaining the sheet properties of graphene, with a distortion of the sp2 bonds towards sp3 due to C-H bonding, whose realization would have a high impact in opto-electronic devices. Experimental achievement of "graphane" with a high H-upload and a low density of defects is still an open problem, though. Furthermore, it has been recently proposed a new high-resolution detector whose core element is tritium (T) bonded to Gr, but the manipulation of T presents severe safety limitations.

In this project we propose a new path to realize "graphane" by bonding of atomic hydrogen (H) and deuterium (D), in a very compact Gr 3D architecture, nano-porous graphene (NPG), which limits the presence of defects with respect to Gr flakes, transferred Gr etc. NPG enhances the surface-active areas ensuring a topological structure with highly connected layers, negligible density of lattice and edge defects, to engineer physical and chemical properties for the desired functionalities.

We will synthesize "graphane" by low-energy ion and hot inlet tube, at increasing H and D doses, and study it by combining x ray photoemission (XPS), Raman and IR, to determine the electronic and optical properties of 3D graphane. We will also exploit synchrotron radiation (SR) spatially-resolved photoemission at SR facilities, where the participating groups are involved in the research and development activities. We will study the chemical bond, the concentration of H and D upload, and the stability of "graphane", also pointing at enlightening possible isotope dependences, of paramount importance in view of the perspective T application.

PE3_4, PE3_10, PE4_2

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