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Manipulation of epitaxial graphene towards novel properties and applications
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-8685-3332
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-1000-0437
Linköping University, Department of Science and Technology, Laboratory of Organic Electronics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-8478-4663
Linköping University, Department of Science and Technology, Laboratory of Organic Electronics. Linköping University, Faculty of Science & Engineering.
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2020 (English)In: MATERIALS TODAY-PROCEEDINGS, ELSEVIER , 2020, Vol. 20, p. 37-45Conference paper, Published paper (Refereed)
Abstract [en]

The integration of epitaxial graphene on 4H-SiC with different metals may allow tunability of electronic and optical properties of graphene, enabling novel high-performance devices. Here we present a Raman spectroscopy study on epitaxial graphene decorated with electrodeposited Pb and Li adatoms and with magnetron sputtered 5 nm-thick Ag nano-island films. We find that the presence of metals on the epitaxial graphene surface generates defects and induces n-type doping, which is evidenced by the observation of the defect related Raman modes (namely D, D and D + G) and systematic red-shift of the main characteristic modes of graphene. In-depth statistical analysis of the Raman data before and after metal deposition complemented by density functional theory (DFT) calculations allowed to link the interaction strength between the three selected metals and graphene with the metal-induced changes in the vibrational/electronic properties of graphene. Large-area uniform electron doping of epitaxial graphene and surface-enhanced Raman scattering (SERS) effect are reached by room temperature deposition of Ag nano-island films. Very promising results have been obtained from graphene subjected to electrochemical intercalation by Li, which can serve as prerequisites of the construction of Li batteries. The strong interaction between Li or Pb with graphene implies the possibility to exploit the epitaxial graphene as an efficient material for energy storage or for heavy metal sensing, while predominant van der Waals interaction between Ag and graphene favors the formation of extremely thin silver coatings towards two-dimensional metal systems. The present results give better understanding of the nature of epitaxial graphene response to metal deposition and can be useful to design high-performance energy storage devices, optical sensors and heavy metal detection systems. (C) 2019 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER , 2020. Vol. 20, p. 37-45
Keywords [en]
Epitaxial graphene; Metals; Lithium; Lead; Silver; Raman mapping
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-170175DOI: 10.1016/j.matpr.2019.08.213ISI: 000508911600008OAI: oai:DiVA.org:liu-170175DiVA, id: diva2:1472143
Conference
International Conference Nano Materials and Devices 2019, Paestum, ITALY, jun 04-08, 2019
Note

Funding Agencies|VR grant [2018-04962, 302791]; SSF grants [SSF GMT14-0077, SSF RMA15-0024]; Angpanneforeningens Forskningsstiftelse [16-541]; Linkoping University ("LiU Career Contract") [Dnr-LiU-2015-01510]; Swedish research councilSwedish Research Council [VR-2015-04630]; Olle Engkvist foundation [SOEB 190-312]; Wenner-Gren foundations [UPD2018-0071]

Available from: 2020-09-30 Created: 2020-09-30 Last updated: 2020-09-30

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Shtepliuk, IvanIvanov, Ivan GueorguievVagin, MikhailKhan, ZiyauddinIakimov, TihomirPliatsikas, NikolaosSarakinos, KostasYakimova, Rositsa
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