| Summary: | 碩士 === 國立成功大學 === 地球科學系 === 104 === Graphene dispersions were produced by liquid-phase exfoliation method. Sonication of graphite powder in alcohol solution can yield graphene dispersions which contains numerous few-layers graphene sheets at micrometer scale, and they can be identified by the Raman spectroscopy and atomic force microscope (AFM). Raman spectroscopy analysis revealed two peaks at ~1580cm-1 and 2600~2700cm-1 called G peak and 2D peak, we focus on shape difference of 2D peak that can use to determine the graphene layers. The conductivity and concentration of dispersions is determined by the conductivity meter and visible absorbance via Lambert – Beer’s law (A=abc). It shows the yield of graphene is about 0.63%. In order to examine the stability of the graphene dispersions, the solution was placed for a month and the concentration variation was measured every interval. The experimental parameters are optimized by adjusting alcohol-water mixture proportion, sonication time, graphite mass and centrifugation speed. This study provides a green liquid-phase exfoliation method to prepare few-layers graphene with alcohol-water mixture.
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