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Extreme electrochemical doping of a graphene-polyelectrolyte heterostructure
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SYSNO ASEP 0434833 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Extreme electrochemical doping of a graphene-polyelectrolyte heterostructure Author(s) Komínková, Zuzana (UFCH-W) RID
Kalbáč, Martin (UFCH-W) RID, ORCIDSource Title RSC Advances. - : Royal Society of Chemistry - ISSN 2046-2069
Roč. 4, č. 22 (2014), s. 11311-11316Number of pages 6 s. Language eng - English Country GB - United Kingdom Keywords electrochemistry ; graphene ; polyelectrolytes Subject RIV CG - Electrochemistry R&D Projects GAP208/12/1062 GA ČR - Czech Science Foundation (CSF) TA03010037 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Institutional support UFCH-W - RVO:61388955 UT WOS 000332469500039 EID SCOPUS 84894413278 DOI https://doi.org/10.1039/c3ra44780d Annotation A doped state of heterostructure, based on chemical vapour deposition grown graphene and polyelectrolytes (polyallylamine hydrochloride and polyacrylic acid), has been studied. The doping was realized electrochemically by application of an electrode potential in LiClO4-acetonitrile electrolyte solution. Our new setup allowed us to achieve extreme doping levels for both positive and negative electrode potentials. The extreme doping of graphene was demonstrated by a large shift of the G mode frequency in the Raman spectrum. In addition a significant enhancement of the G mode at large positive and also negative electrode potentials has been experimentally observed. The G mode intensity enhancement was attributed to cancelling of a part of the quantum Raman pathways thus reducing the destructive quantum interference effect. Since this effect only occurs if the Fermi level achieves half of the laser excitation energy, experimental observation of this phenomenon also confirms the extreme doping levels of graphene. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2015
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