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Tip-Enhanced Raman Scattering of the Local Nanostructure of Epitaxial Graphene Grown on 4H-SiC (0001Ģ )
- Source :
- The Journal of Physical Chemistry C. 118:25809-25815
- Publication Year :
- 2014
- Publisher :
- American Chemical Society (ACS), 2014.
-
Abstract
- Step, ridge, and crack submicro/nanostructures of epitaxial graphene on 4H-SiC (0001) were characterized using tip-enhanced Raman scattering (TERS) spectroscopy. The nanostructures were created during graphene synthesis due to a difference in the thermal expansion coefficient of graphene and SiC. These structures are a distinctive property of epitaxial graphene, together with other desirable properties, such as large graphene sheet and minimal defects. The results of this study illustrate that the exceptional spatial resolution of TERS allows spectroscopic measurements of individual nanostructures, a feat which normal Raman spectroscopy is not capable of. By analyzing TERS spectra, the change of local strain on the nanoridge and decreased graphene content in the submicrometer crack were detected. Using Gā² band positions in the TERS spectra, the strain difference between the ridge center and flat area was calculated to be 1.6 × 10ā3 and 5.8 × 10ā4 for uniaxial and biaxial strain, respectively. This confir...
- Subjects :
- Nanostructure
Materials science
business.industry
Graphene
Nanotechnology
Spectral line
Thermal expansion
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
law.invention
symbols.namesake
General Energy
law
symbols
Optoelectronics
Physical and Theoretical Chemistry
Spectroscopy
Raman spectroscopy
business
Raman scattering
Graphene nanoribbons
Subjects
Details
- ISSN :
- 19327455 and 19327447
- Volume :
- 118
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry C
- Accession number :
- edsair.doi...........427f7c8766277eb30f9b327f98977864