Terahertz charge transport dynamics in 3D graphene networks with localization and band regimes

0572515 - FZÚ 2024 RIV GB eng J - Článek v odborném periodiku
Kumar, Prabhat - Šilhavík, Martin - Parida, Manas Ranjan - Němec, Hynek - Červenka, Jiří - Kužel, Petr
Terahertz charge transport dynamics in 3D graphene networks with localization and band regimes.
Nanoscale Advances. Roč. 5, č. 11 (2023), s. 2933-2940. ISSN 2516-0230. E-ISSN 2516-0230
Grant CEP: GA MŠMT EF16_026/0008382; GA MŠMT(CZ) EF16_019/0000760
GRANT EU: European Commission(XE) 101028425 - 3D-AM-TERA
Grant ostatní: Ministerstvo školství, mládeže a tělovýchovy - GA MŠk(CZ) CZ.02.1.01/0.0/0.0/16_026/0008382; OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institucionální podpora: RVO:68378271
Klíčová slova: terahertz * graphene * networks
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 4.7, rok: 2022
Způsob publikování: Open access

Terahertz steady-state and time-resolved conductivity and permittivity spectra were measured in 3D graphene networks assembled in free-standing covalently cross-linked graphene aerogels. Investigation of a transition between reduced-graphene oxide and graphene controlled by means of high-temperature annealing allowed us to elucidate the role of defects in the charge carrier transport in the materials. The THz spectra reveal increasing conductivity and decreasing permittivity with frequency. This contrasts with the Drude- or Lorentz-like conductivity typically observed in various 2D graphene samples, suggesting a significant contribution of a relaxational mechanism to the conductivity in 3D graphene percolated networks. The charge transport in the graphene aerogels exhibits an interplay between the carrier hopping among localized states and a Drude contribution of conduction-band carriers. Our findings provide important insight into the charge transport in complex graphene structures.
Trvalý link: https://hdl.handle.net/11104/0343184