Department of Chemistry, Beijing Key Laboratory for Analytical Methods and Instrumentation, Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Tsinghua University, Beijing 100084, China.
Nat Commun. 2013;4:1539. doi: 10.1038/ncomms2555.
Chemical reduction of graphene oxide can be used to produce large quantities of reduced graphene oxide for potential application in electronics, optoelectronics, composite materials and energy-storage devices. Here we report a highly efficient one-pot reduction of graphene oxide using a sodium-ammonia solution as the reducing agent. The solvated electrons in sodium-ammonia solution can effectively facilitate the de-oxygenation of graphene oxide and the restoration of π-conjugation to produce reduced graphene oxide samples with an oxygen content of 5.6 wt%. Electrical characterization of single reduced graphene oxide flakes demonstrates a high hole mobility of 123 cm(2) Vs(-1). In addition, we show that the pre-formed graphene oxide thin film can be directly reduced to form reduced graphene oxide film with a combined low sheet resistance (~350 Ω per square with ~80% transmittance). Our study demonstrates a new, low-temperature solution processing approach to high-quality graphene materials with lowest sheet resistance and highest carrier mobility.
氧化石墨烯的化学还原可用于大量生产还原氧化石墨烯，潜在应用于电子学、光电学、复合材料和储能器件。在此，我们报告了一种使用钠氨溶液作为还原剂的高效一步还原法。钠氨溶液中的溶剂化电子能有效促进氧化石墨烯的脱氧和π键的恢复，生成氧含量为 5.6wt%的还原氧化石墨烯样品。单还原氧化石墨烯片的电学特性表明其空穴迁移率高达 123cm2Vs-1。此外，我们表明预先形成的氧化石墨烯薄膜可直接还原形成具有低面电阻（350Ω/平方，80%透光率）的还原氧化石墨烯薄膜。我们的研究展示了一种新的、低温溶液处理方法，可获得具有最低面电阻和最高载流子迁移率的高质量石墨烯材料。
