Thinning and functionalization of few-layer graphene sheets by CF(4) plasma treatment

ABSTRACT: Structural changes of few-layer graphene sheets induced by CF(4) plasma treatment are studied by optical microscopy and Raman spectroscopy, together with theoretical simulation. Experimental results suggest a thickness reduction of few-layer graphene sheets subjected to prolonged CF(4) pla...

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Detalles Bibliográficos
Autores principales: Shen, Chao, Huang, Gaoshan, Cheng, Yingchun, Cao, Ronggen, Ding, Fei, Schwingenschlögl, Udo, Mei, Yongfeng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer 2012
Materias:
Nano Express
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3458992/
https://www.ncbi.nlm.nih.gov/pubmed/22625875
http://dx.doi.org/10.1186/1556-276X-7-268
Descripción
Sumario:ABSTRACT: Structural changes of few-layer graphene sheets induced by CF(4) plasma treatment are studied by optical microscopy and Raman spectroscopy, together with theoretical simulation. Experimental results suggest a thickness reduction of few-layer graphene sheets subjected to prolonged CF(4) plasma treatment while plasma treatment with short time only leads to fluorine functionalization on the surface layer by formation of covalent bonds. Raman spectra reveal an increase in disorder by physical disruption of the graphene lattice as well as functionalization during the plasma treatment. The F/CF(3) adsorption and the lattice distortion produced are proved by theoretical simulation using density functional theory, which also predicts p-type doping and Dirac cone splitting in CF(4) plasma-treated graphene sheets that may have potential in future graphene-based micro/nanodevices. PACS: 81.05.ue; 73.22.Pr; 52.40.Hf.

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