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Terahertz charge transport dynamics in 3D graphene networks with localization and band regimes
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SYSNO ASEP 0572515 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Terahertz charge transport dynamics in 3D graphene networks with localization and band regimes Author(s) Kumar, Prabhat (FZU-D) ORCID
Šilhavík, Martin (FZU-D) ORCID
Parida, Manas Ranjan (FZU-D) ORCID
Němec, Hynek (FZU-D) RID, ORCID, SAI
Červenka, Jiří (FZU-D) RID, ORCID
Kužel, Petr (FZU-D) RID, ORCID, SAINumber of authors 6 Source Title Nanoscale Advances. - : Royal Society of Chemistry - ISSN 2516-0230
Roč. 5, č. 11 (2023), s. 2933-2940Number of pages 8 s. Language eng - English Country GB - United Kingdom Keywords terahertz ; graphene ; networks Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects EF16_026/0008382 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF16_019/0000760 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000984116400001 EID SCOPUS 85159162265 DOI 10.1039/D2NA00844K Annotation 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. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2024 Electronic address https://hdl.handle.net/11104/0343184
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