研究目的
Investigating the preparation process of graphene flakes by exfoliation method and their characterization by Raman spectroscopy, as well as exploring some possible uses of graphene flakes applied to develop optical communication high speed devices.
研究成果
The micromechanically exfoliated graphene flakes were successfully prepared and characterized. Monolayer graphene has important opto-electronic characteristics that are useful in optical communication applications, such as the generation of ultrashort pulses, broadband polarizers and optical modulators.
研究不足
The micromechanical exfoliation process is very inefficient for a large-scale production. The size of the flake is very important for the interaction between graphene and the optical signal, and obtaining larger flakes by micromechanical exfoliation is difficult.
1：Experimental Design and Method Selection:
The micromechanical exfoliation process was used to obtain graphene flakes from graphite. Raman spectroscopy was employed for characterization.
2：Sample Selection and Data Sources:
Graphite from Nacional de Grafite Company was used. The samples were identified and characterized using an optical microscope and Raman spectrometer.
3：List of Experimental Equipment and Materials:
Scotch tape, SiO2/Si substrate, optical microscope OLYPUMS BX 51M, Raman spectrometer Alpha 300 R Confocal Raman Microscopy System.
4：Experimental Procedures and Operational Workflow:
The exfoliation process involved covering a graphite sample with Scotch tape and successively removing it. The graphene flakes were then transferred to a SiO2/Si substrate and characterized.
5：Data Analysis Methods:
The relation between intensities of the bands I(2D)/I(G) and the full-width at half-maximum (FWHM) of the band 2D were used for characterization.
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