还原氧化石墨烯已被广泛用于制备基于石墨烯的材料。目前，还原处理方法均是尽可能地将氧化石墨烯中的功能团去除，恢复石墨烯的电子结构。由于氧化石墨烯中氧基功能团(如羟基、羧基及环氧基)不同的反应活性，氧化石墨烯是可能通过分步的方法进行还原。利用醇溶剂如乙醇、乙二醇、丙三醇还原氧化石墨烯，并采用不同分析手段对样品进行表征。结果发现，在一定条件下这些醇可选择性地还原氧化石墨烯。经这些醇的处理后，氧化石墨烯中环氧功能团被大部分去除，而其他的功能团如羟基和羧基仍被保留。这种选择性去除氧化石墨烯表面功能团的方法可利于有效地控制氧化石墨烯的还原程度、获得具有特定功能团的石墨烯衍生物，从而扩大这类材料的使用范围。
The reduction of graphene oxide has been widely used to control the properties of graphene-based materials. Traditional methods thoroughly remove oxygenated functional groups in graphene oxides. We show that ethanol, ethylene glycol and glycerol can se-lectively reduce epoxy groups in graphene oxide while hydroxyl and carboxyl groups remain unchanged. Hydrazine hydrate can reduce ox-ygen functional groups except carboxyl groups. These selective removals can be used to control the reduction degree of graphene oxides and their properties. The electrical conductivity of the reduced graphene oxides with different types of oxygen functional groups varied sig-nificantly and increased with the degree of reduction.
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