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In-situ Raman Spectroscopy of the Graphene / Water Interface of a Solution-Gated Field Effect Transistor: Electron-Phonon Coupling and Spectroelectrochemistry
- Publication Year :
- 2014
-
Abstract
- We present a novel measurement approach which combines the electrical characterization of solution-gated field effect transistors based on epitaxial bilayer graphene on 4H-SiC (0001) with simultaneous Raman spectroscopy. By changing the gate voltage, we observed Raman signatures related to the resonant electron-phonon coupling. An analysis of these Raman bands enabled the extraction of the geometrical capacitance of the system and an accurate calculation of the Fermi levels for bilayer graphene. An intentional application of higher gate voltages allowed us to trigger electrochemical reactions, which we followed in-situ by Raman spectroscopy. The reactions showed a partially reversible character, as indicated by an emergence / disappearance of peaks assigned to C-H and Si-H vibration modes as well as an increase / decrease of the defect-related Raman D band intensity. Our setup provides a highly interesting platform for future spectroelectrochemical research on electrically induced sorption processes of graphene on the micrometer scale.
- Subjects :
- Materials science
Phonon
FOS: Physical sciences
Bioengineering
02 engineering and technology
01 natural sciences
7. Clean energy
law.invention
symbols.namesake
law
Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
0103 physical sciences
General Materials Science
Electrical and Electronic Engineering
010306 general physics
Spectroscopy
Condensed Matter - Mesoscale and Nanoscale Physics
business.industry
Graphene
Mechanical Engineering
Fermi level
General Chemistry
021001 nanoscience & nanotechnology
Semimetal
Mechanics of Materials
symbols
Optoelectronics
Field-effect transistor
0210 nano-technology
Bilayer graphene
Raman spectroscopy
business
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....a3d3cc2183301e4a7af03387e91373f5