Plasma‐Driven Tuning of Dielectric Permittivity in Graphene

Author:

Tatarova Elena1ORCID,Dias Ana1,Dankov Plamen2ORCID,Kissovski Jivko2,Botelho do Rego Ana Maria3,Bundaleska Neli1ORCID,Felizardo Edgar1ORCID,Abrashev Miroslav2ORCID,Ferraria Ana Maria3ORCID,Strunskus Thomas4ORCID,Shvalya Vasyl5ORCID,Santhosh Neelakandan M.5ORCID,Ivanov Ivan Valeriev2,Košiček Martin5ORCID,Zavašnik Janez5ORCID,Alves Luis Lemos1ORCID,Gonçalves Bruno1,Cvelbar Uroš5ORCID

Affiliation:

1. Instituto de Plasmas e Fusão Nuclear Instituto Superior Técnico Universidade de Lisboa Lisboa 1049 Portugal

2. Faculty of Physics Sofia University Sofia 1164 Bulgaria

3. BSIRG iBB–Institute for Bioengineering and Biosciences Department of Chemical Engineering (DEQ) and Associate Laboratory i4HB–Institute for Health and Bioeconomy Instituto Superior Técnico Universidade de Lisboa Lisbon 1049‐001 Portugal

4. Institute for Materials Science Christian Albrechts Universitaet zu Kiel 24118 Kiel Germany

5. Department of Gaseous Electronics (F6) Jožef Stefan Institute Ljubljana 1000 Slovenia

Abstract

AbstractMaterials with tunable negative electromagnetic performance, i.e., where dielectric permittivity becomes negative, have long been pursued in materials research due to their peculiar electromagnetic (EM) characteristics. Here, this promising feature is reported in materials on the case of plasma‐synthesized nitrogen‐doped graphene sheets with tunable permittivity over a wide (1–40 GHz) frequency range. Selectively incorporated nitrogen atoms in a graphene scaffold tailor the electronic structure in a way that provides an ultra‐low energy (0.5–2 eV) 2D surface plasmon excitation, leading to subunitary and negative dielectric constant values in the Ka‐band, from 30 up to 40 GHz. By allowing the tailoring of structures at atomic scale, this novel plasma‐based approach creates a new paradigm for designing 2D nanomaterials like nanocarbons with controllable and tunable permittivity, opening a path to the next generation of 2D metamaterials.

Funder

Javna Agencija za Raziskovalno Dejavnost RS

Publisher

Wiley

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