Tuning the Electronic Response of Metallic Graphene by Potassium Doping.

Content Provider	Europe PMC
Author	Marchiani, Dario Tonelli, Andrea Mariani, Carlo Frisenda, Riccardo Avila, José Dudin, Pavel Jeong, Samuel Ito, Yoshikazu Magnani, Francesco Saverio Biagi, Roberto De Renzi, Valentina Betti, Maria Grazia
Copyright Year	2022
Abstract	Electron doping of graphene has been extensively studiedon graphene-supportedsurfaces, where the metallicity is influenced by the substrate. Herewithwe propose potassium adsorption on free-standing nanoporous graphene,thus eluding any effect due to the substrate. We monitor the electronmigration in the π* downward-shifted conduction band. In thisrigid band shift, we correlate the spectral density of the π*state in the upper Dirac cone with the associated plasmon, blue-shiftedwith increasing K dose, as deduced by electron energy loss spectroscopy.These results are confirmed by the Dirac plasmon activated by theC 1s emitted electrons, thanks to spatially resolved photoemission.This crosscheck constitutes a reference on the correlation betweenthe electronic π* states in the conduction band and the Diracplasmon evolution upon in situ electron doping of fully free-standinggraphene.
ISSN	15306984
Journal	Nano Letters
Volume Number	23
PubMed Central reference number	PMC9838101
Issue Number	1
PubMed reference number	36562744
e-ISSN	15306992
DOI	10.1021/acs.nanolett.2c03891
Language	English
Publisher	American Chemical Society
Publisher Date	2022-12-23
Access Restriction	Open
Rights License	Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). © 2022 The Authors. Published by American Chemical Society
Subject Keyword	nanoporous graphene alkali metal doping spectromicroscopy plasmon
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Chemistry Condensed Matter Physics Bioengineering Materials Science Mechanical Engineering