NDLI: Microstructure evolution of diazonium functionalized graphene: A potential approach to change graphene electronic structure

Content Provider	Royal Society of Chemistry (RSC)
Author	Gao, Xueyun Huang, Ping Jing, Long Zuo, Taisen Zhu, Huarui Zhao, Yuliang
Copyright Year	2012
Abstract	Graphene sheets were successfully functionalized with 4-nitrophenyl diazonium (NPD). Two dimensional Raman analysis demonstrated that the reaction preferred to happen on single-layer graphene rather than bi-layer or multi-layer, and the edges of graphene were more reactive than the central areas. Atomic force microscopy (AFM) indicated the aryl groups were covalently bonded to one side of the graphene basal plane in a perpendicular configuration. Transmission electron microscopy (TEM) and selected area electron diffraction (SAED) manifested that the modified graphene maintained the hexagonal symmetry but its microstructure changed. The main change was that the crystal lattice expanded compared with that of pristine graphene. Meanwhile, for the first time, a crystal lattice constant d ≈ 5.30 Å of functionalized graphene was obtained, which was approximately twice that of the pristine graphene's crystal lattice constant. This implied that the modified graphene had a super-lattice microstructure. Furthermore, the fast Fourier transform (FFT) of the modified graphene verified the formation of the super-lattice structures, and density functional theory (DFT) calculations showed the stability of the super-lattice structures. These modifications—elongation of crystal lattice constant and formation of super-lattice structures—may induce different electronic structures in graphene.
Starting Page	2063
Ending Page	2068
Page Count	6
File Format	HTM / HTML PDF
ISSN	09599428
Volume Number	22
Issue Number	5
Journal	Journal of Materials Chemistry
DOI	10.1039/c1jm14862a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Raman Fourier Graphene Diazonium compound Atomic-force microscopy Aromaticity Crystal structure Transmission electron microscopy Electron diffraction Lattice constant Superlattice Fast Fourier transform Density functional theory
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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