化学剥离石墨烯片的溶剂热还原
Solvothermal Reduction of Chemically Exfoliated Graphene Sheets
摘要：
石墨烯因其有趣的性质和潜在的应用而引起了人们的广泛关注。化学剥离法是近年来发展起来的一种制备石墨烯的新方法，主要用于大规模组装和应用，如复合材料和锂离子电池。虽然有效，但化学剥离方法涉及石墨烯的氧化并在制成的片材中引入缺陷。在100下的肼还原已显示部分恢复氧化石墨的结构和电导。然而，还原的GO在拉曼光谱中仍然显示出强的缺陷峰，其电阻率比原始石墨烯高2至3个数量级。重要的是生产比GO少得多的缺陷石墨烯片，并开发更有效的石墨烯还原。最近，我们报道了一种温和的剥离-再嵌入-膨胀方法，以形成比GO具有更高电导率和更低氧化度的高质量GS。5在这里，我们提出了一种180溶剂热还原方法用于我们的GS和GO。溶剂热还原在降低GS中的氧和缺陷水平、增加石墨烯域以及使GS的电导率接近原始石墨烯方面比早期的还原方法更有效。还原的GS在化学衍生的石墨烯中具有最高程度的原生性。
英文摘要：
Graphene has attracted much attention due to its interesting properties and potential applications. Chemical exfoliation methods have been developed to make graphene recently, aimed at large-scale assembly and applications such as composites and Li ion batteries. Although efficient, the chemical exfoliation methods involve oxidation of graphene and introduce defects in the as-made sheets. Hydrazine reduction at 100 has shown to partially restore the structure and conductance of graphite oxide. However, the reduced GO still shows strong defect peaks in Raman spectra with higher resistivity than pristine graphene by 2 to 3 orders of magnitude. It is important to produce much less defective graphene sheets than GO, and develop more effective graphene reduction. Recently, we reported a mild exfoliation-reintercalation-expansion method to form high-quality GS with higher conductivity and lower oxidation degree than GO.5 Here, we present a 180 solvothermal reduction method for our GS and GO. The solvothermal reduction is more effective than the earlier reduction methods in lowering the oxygen and defect levels in GS, increasing the graphene domains, and bringing the conductivity of GS close to pristine graphene. The reduced GS possess the highest degree of pristinity among chemically derived graphene.
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