The structural and electrical evolution of graphene by oxygen plasma-induced disorder

Evolution of a single graphene layer with disorder generated by remote oxygen plasma irradiation is investigated using atomic force microscopy, Raman spectroscopy and electrical measurement. Gradual changes of surface morphology from planar graphene to isolated granular structure associated with a d...

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Published inNanotechnology Vol. 20; no. 37; p. 375703
Main Authors Kim, Dong Chul, Jeon, Dae-Young, Chung, Hyun-Jong, Woo, YunSung, Shin, Jai Kwang, Seo, Sunae
Format Journal Article
LanguageEnglish
Published England IOP Publishing 16.09.2009
Subjects
Electrochemical Techniques
Graphite - chemistry
Microscopy, Atomic Force
Nanostructures - chemistry
Nanotechnology - methods
Spectrum Analysis, Raman
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Summary:Evolution of a single graphene layer with disorder generated by remote oxygen plasma irradiation is investigated using atomic force microscopy, Raman spectroscopy and electrical measurement. Gradual changes of surface morphology from planar graphene to isolated granular structure associated with a decrease of transconductance are accounted for by two-dimensional percolative conduction by disorder and the oxygen plasma-induced doping effect. The corresponding evolution of Raman spectra of graphene shows several peculiarities such as a sudden appearance of a saturated D peak followed by a linear decrease in its intensity, a relatively inert characteristic of a D' peak and a monotonic increase of a G peak position as the exposure time to oxygen plasma increases. These are discussed in terms of a disorder-induced change of Raman spectra in the graphite system.
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ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/20/37/375703