通过测试石墨烯分散液的吸光度,比较了几种表面活性剂分散石墨烯的能力.结果表明:聚乙烯吡咯烷酮(PVP)这种"绿色"、低成本的表面活性剂,具有很好的分散能力.通过提高PVP溶液浓度,可以得到浓度高达～1.3mg/mL的石墨烯分散液,这种高浓度石墨烯分散液可以在气液界面自组装得到石墨烯膜,这种无支撑石墨烯膜具有平整的表面和规则的结构,在很多领域都有良好的潜在应用价值.
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