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中文摘要：
以Hummers法制备氧化石墨,超声剥离得到氧化石墨烯（graphene oxide,GO）。在25℃和90℃两种温度下,以聚乙烯亚胺（polyethyleneimine,PEI）为GO的还原剂和修饰剂,制备了PEI改性石墨烯分散液。光电子能谱和红外光谱揭示了温度对PEI还原GO反应的影响。研究结果表明：25℃时,PEI具有部分还原GO的能力,得到PEI修饰的氧化石墨烯（PEI-GO）;90℃时,接枝的PEI逐渐从GO片层上解离,并将GO还原为表面修饰的石墨烯（PEI-RGO）。将石墨烯分散液抽滤组装为PEI-RGO薄膜,发现其电导率为117 S·m^（-1）,有望用于石墨烯导电材料。
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