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- Title
Deuterium Adsorption on Free-Standing Graphene.
- Authors
Abdelnabi, Mahmoud Mohamed Saad; Izzo, Chiara; Blundo, Elena; Betti, Maria Grazia; Sbroscia, Marco; Di Bella, Giulia; Cavoto, Gianluca; Polimeni, Antonio; García-Cortés, Isabel; Rucandio, Isabel; Moroño, Alejandro; Hu, Kailong; Ito, Yoshikazu; Mariani, Carlo
- Abstract
A suitable way to modify the electronic properties of graphene—while maintaining the exceptional properties associated with its two-dimensional (2D) nature—is its functionalisation. In particular, the incorporation of hydrogen isotopes in graphene is expected to modify its electronic properties leading to an energy gap opening, thereby rendering graphene promising for a widespread of applications. Hence, deuterium (D) adsorption on free-standing graphene was obtained by high-energy electron ionisation of D 2 and ion irradiation of a nanoporous graphene (NPG) sample. This method allows one to reach nearly 50 at.% D upload in graphene, higher than that obtained by other deposition methods so far, towards low-defect and free-standing D-graphane. That evidence was deduced by X-ray photoelectron spectroscopy of the C 1s core level, showing clear evidence of the D-C sp 3 bond, and Raman spectroscopy, pointing to remarkably clean and low-defect production of graphane. Moreover, ultraviolet photoelectron spectroscopy showed the opening of an energy gap in the valence band. Therefore, high-energy electron ionisation and ion irradiation is an outstanding method for obtaining low defect D-NPG with a high D upload, which is very promising for the fabrication of semiconducting graphane on large scale.
- Subjects
DEUTERIUM; HYDROGEN isotopes; X-ray photoelectron spectroscopy; PHOTOELECTRON spectroscopy; ULTRAVIOLET spectroscopy; BAND gaps
- Publication
Nanomaterials (2079-4991), 2021, Vol 11, Issue 1, p130
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano11010130