Journal Article10.1021/NN1015506
Efficient Preparation of Large-Area Graphene Oxide Sheets for Transparent Conductive Films
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TL;DR: A modified chemical exfoliation technique to prepare large-area graphene oxide (GO) sheets is introduced and it is found that the GO area is strongly correlated with the C-O content of the graphite oxide, which enables the area of the synthesized GO sheets to be controlled.
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Abstract: Large-area sheets are highly desirable for fundamental research and technological applications of graphene. Here we introduce a modified chemical exfoliation technique to prepare large-area graphene oxide (GO) sheets. The maximum area of the GO sheets obtained can reach ∼40000 μm2. We found that the GO area is strongly correlated with the C−O content of the graphite oxide, which enables the area of the synthesized GO sheets to be controlled. By simply changing oxidation conditions, GO sheets with an average area of ca. 100−300, ca. 1000−3000, and ∼7000 μm2 were selectively synthesized. For transparent conductive film applications, thin GO films were fabricated by self-assembly on a liquid/air interface and reduced by HI acid. We found that the sheet resistance of the reduced GO (rGO) films decreases with increasing sheet area at the same transmittance because of the decrease in the number of intersheet tunneling barriers. The rGO film made from GO sheets with an average area of ∼7000 μm2 shows a sheet res...
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References
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