An International Research Journal

Vol 27 Nos 7&8

AJP

SSN : 0971 - 3093

Vol 27, Nos 7 & 8, July-August, 2018


Asian Journal of Physics                                                                                                             Vol. 27 Nos 7 & 8, (2018), 00-00


Raman spectroscopy of CVD-grown monolayer and bilayer graphenes


Yu-Chen Leng1,2, Miao-Ling Lin1,2 and Ping-Heng Tan1,2,*

1State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
2CAS Center of Excellence in Topological Quantum Computation, and College of Materials Science and Opto-Electronic Technology,
University of Chinese Academy of Sciences, Beijing 100049, China

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Monolayer graphene (1LG) and bilayer graphene (2LG) grown by chemical vapor deposition (CVD) are promising materials for electronic and optoelectronic devices. As a non-destructive characterization technique, Raman spectroscopy is widely used to detect the properties of graphene. Here, we review the Raman spectra of CVD-grown 1LG and 2LG. The Raman spectra of CVD-grown 1LG (CVD-1LG) and exfoliated 1LG (ex-1LG) were compared in the D and G spectral regions. The CVD-2LG tends to stack with a relative twist angle, which is usually denoted as t(1+1)LG. The Raman intensity of the G mode (|(G)) of the t(1+1)LG can be greatly enhanced under specific excitation energies, which is closely related with the twist angle of t(1+1)LG. The twist angle can be determined by the peak positions of R and R' modes. The CVD-1LG flakes can be distinguished by comparing its |(G) with that of ex-1LG whereas CVD-2LG can be identified by the optical contrast. © Anita Publications. All rights reserved.

Keywords: CVD-grown graphene, twist bilayer graphene, Raman spectra.

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