Spin-Injection in Graphene: An EPR and Raman Study

Christos Fragkogiannis; Loukas Belles; Dimitrios P Gournis; Yiannis Deligiannakis; Vasilios Georgakilas

doi:10.1002/chem.202301720

Spin-Injection in Graphene: An EPR and Raman Study

Chemistry. 2023 Oct 23;29(59):e202301720. doi: 10.1002/chem.202301720. Epub 2023 Sep 20.

Authors

Christos Fragkogiannis¹, Loukas Belles², Dimitrios P Gournis³, Yiannis Deligiannakis², Vasilios Georgakilas¹

Affiliations

¹ Materials Science Department, University of Patras, 26504, Rio, Greece.
² Laboratory of Physical Chemistry of Materials & Environment, Department of Physics, University of Ioannina, 45110, Ioannina, Greece.
³ Department of Materials Science and Engineering, University of Ioannina, 45110, Ioannina, Greece.

PMID: 37515521
DOI: 10.1002/chem.202301720

Abstract

In this article, the enrichment of graphene and graphene oxide with free radicals through their functionalization with tyrosine is studied. In contrast with what is commonly observed in the functionalization of graphene with organic species the addition of tyrosine radicals on to the graphene substrate led to a remarkable increase of the aromatic character as indicated by the spectroscopic data. Similar behaviour was observed for the functionalization of graphene oxide. In addition, a brief analysis of the tyrosine functionalized graphene with EPR spectroscopy showed a remarkable enhancement of the spin density that could be useful in spintronics.

Keywords: EPR study of graphene; aromaticity; graphene; graphene functionalisation; spin injection.