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Tuning the Electronic Response of Metallic Graphene by Potassium Doping
- Source :
- Nano Letters; January 2023, Vol. 23 Issue: 1 p170-176, 7p
- Publication Year :
- 2023
-
Abstract
- Electron doping of graphene has been extensively studied on graphene-supported surfaces, where the metallicity is influenced by the substrate. Herewith we propose potassium adsorption on free-standing nanoporous graphene, thus eluding any effect due to the substrate. We monitor the electron migration in the π* downward-shifted conduction band. In this rigid band shift, we correlate the spectral density of the π* state in the upper Dirac cone with the associated plasmon, blue-shifted with increasing K dose, as deduced by electron energy loss spectroscopy. These results are confirmed by the Dirac plasmon activated by the C 1s emitted electrons, thanks to spatially resolved photoemission. This crosscheck constitutes a reference on the correlation between the electronic π* states in the conduction band and the Dirac plasmon evolution upon in situ electron doping of fully free-standing graphene.
Details
- Language :
- English
- ISSN :
- 15306984 and 15306992
- Volume :
- 23
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Nano Letters
- Publication Type :
- Periodical
- Accession number :
- ejs61513456
- Full Text :
- https://doi.org/10.1021/acs.nanolett.2c03891