Department of Physics and Astronomy, Wayne State University, Detroit, MI 48201, USA.
Nanotechnology. 2011 Aug 12;22(32):325201. doi: 10.1088/0957-4484/22/32/325201. Epub 2011 Jul 14.
A simple one-stage solution-based method was developed to produce graphene nanoribbons by sonicating graphite powder in organic solutions with polymer surfactant. The graphene nanoribbons were deposited on a silicon substrate, and characterized by Raman spectroscopy and atomic force microscopy. Single-layer and few-layer graphene nanoribbons with a width ranging from sub-10 nm to tens of nanometers and lengths ranging from hundreds of nanometers to 1 µm were routinely observed. The electrical transport properties of individual graphene nanoribbons were measured in both the back-gate and polymer-electrolyte top-gate configurations. The mobility of the graphene nanoribbons was found to be over an order of magnitude higher when measured in the latter than in the former configuration (without the polymer-electrolyte), which can be attributed to the screening of the charged impurities by the counter ions in the polymer-electrolyte. This finding suggests that the charge transport in these solution produced graphene nanoribbons is largely limited by charge impurity scattering.
一种简单的基于单步溶液法，通过在聚合物表面活性剂的有机溶剂中超声石墨粉，制备出了石墨烯纳米带。将石墨烯纳米带沉积在硅基底上，通过拉曼光谱和原子力显微镜对其进行了表征。通常可以观察到宽度从亚 10nm 到数十纳米、长度从数百纳米到 1μm 的单层和少数层石墨烯纳米带。在背栅和聚合物电解质顶栅两种配置下，对单个石墨烯纳米带的输运性质进行了测量。在聚合物电解质存在的情况下，石墨烯纳米带的迁移率比在后一种配置（没有聚合物电解质）下高出一个数量级，这可以归因于聚合物电解质中的抗衡离子对带电杂质的屏蔽作用。这一发现表明，这些溶液制备的石墨烯纳米带中的电荷输运主要受到电荷杂质散射的限制。
