Jiangsu Key Laboratory for Organic Electronics & Information Displays, Institute of Advanced Materials, Nanjing University of Posts and Telecommunications, 9 Wenyuan Road, Nanjing 210046, China.
Phys Chem Chem Phys. 2010 Mar 7;12(9):2164-9. doi: 10.1039/b914546j. Epub 2010 Jan 15.
Graphene is a promising candidate for making next-generation nanoelectronic devices. Developing methods to produce large sized graphene with high yield is the key for graphene applications. Here, we report a simple method for large-scale production of ultra-large single-layer graphene sheet (up to 50 microm) reduced from graphene oxides by hydrazine in the presence of aromatic tetrasodium 1,3,6,8-pyrenetetrasulfonic acid (TPA) which efficiently disperse the resulting graphene sheet in aqueous solutions. Field-effect transistors can be readily fabricated using such large reduced graphene oxide sheets. It was found that the mobility of the reduced graphene oxide increases with the temperature of subsequent thermal reduction and reaches 3.5 cm(2) V(-1) s(-1) after reduction at 1000 degrees C. Such solution-processable method is of great potential in printable fabrication of graphene-based devices.
石墨烯是下一代纳米电子器件的理想候选材料。开发大规模制备高产率大尺寸石墨烯的方法是实现石墨烯应用的关键。在此，我们报告了一种在芳香族四磺酸钠 1,3,6,8-苝四磺酸（TPA）存在下，通过水合肼还原氧化石墨烯制备超大单层石墨烯片（最大 50 微米）的简单方法。TPA 可有效将所得石墨烯片分散在水溶液中。使用这种大尺寸还原氧化石墨烯片可轻松制备场效应晶体管。研究发现，还原氧化石墨烯的迁移率随后续热还原温度的升高而增大，在 1000℃还原后达到 3.5 cm(2) V(-1) s(-1)。这种溶液处理方法在基于石墨烯器件的可印刷制造中具有很大的潜力。
