Open AccessRaman spectra of bilayer graphene covered with Poly(methyl methacrylate) thin film
Author(s) -
Minggang Xia,
Zhidan Su,
Shengli Zhang
Publication year - 2012
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/1.4739785
Subject(s) - graphene , materials science , raman spectroscopy , methyl methacrylate , thin film , laser , bilayer , bilayer graphene , graphene nanoribbons , composite material , optoelectronics , nanotechnology , membrane , optics , polymer , copolymer , chemistry , biochemistry , physics
The Raman spectra of bilayer graphene covered with poly(methyl methacrylate) (PMMA) were investigated. Both the G and 2D peaks of PMMA-coated graphene were stiff and broad compared with those of uncovered graphene. This could be attributed to the residual strain induced by high-temperature baking during fabrication of the nanodevice. Furthermore, the two 2D peaks stiffened and broadened with increasing laser power, which is just the reverse to uncovered graphene. The stiffness is likely caused by graphene compression induced by the circular bubble of the thin PMMA film generated by laser irradiation. Our findings may contribute to the application of PMMA in the strain engineering of graphene nanodevices