Growth of non-concentric graphene ring on 6H-SiC (0001) surface

•The diameter of graphene ring is small (about 500nm). It is suitable to apply for nanodevice.•The fabrication method of the graphene ring is bottom up. Therefore the edge structure is intact.•The graphene ring is non-concentric and leads to the efficiency of optical antennas increase.•This method c...

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Bibliographic Details
Published in:Applied surface science 2014-07, Vol.307, p.136-141
Main Authors: Ruammaitree, A., Nakahara, H., Saito, Y.
Format: Article
Language:English
Subjects:
Annealing
Antenna
Antennas
Atomic force microscopy
Chairs
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Direct power generation
Eccentricity
Energy management
Exact sciences and technology
Graphene
Graphene ring
Lithography
Physics
Scanning electron microscope
Scanning tunneling microscope
Si-terminated 6H-SiC
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Summary:•The diameter of graphene ring is small (about 500nm). It is suitable to apply for nanodevice.•The fabrication method of the graphene ring is bottom up. Therefore the edge structure is intact.•The graphene ring is non-concentric and leads to the efficiency of optical antennas increase.•This method can control the size of graphene ring by adjusting annealing temperature and time. Optical antennas are devices that efficiently convert the energy of free propagating radiation into localized energy and vice versa. Optical antennas can be applied for sensing, photodetection, light emission, spectroscopy and so on. In this report we have demonstrated the growth of off-center graphene rings by annealing Si-terminated 6H-SiC under inert gas pressure of 0.05atm. The eccentricity of the graphene ring can increase the efficiency of optical antennas. In addition, this bottom-up fabrication method can keep ring edges intact unlike e-beam lithography. The edge structure of the ring is, moreover, armchair edge. We found that the width of the ring depends on annealing temperature and time.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2014.03.181