离子液体和水溶液中石墨烯的电化学门控电荷传输
Electrochemical gate-controlled charge transport in graphene in ionic liquid and aqueous solution.
作者信息
Chen Fang, Qing Quan, Xia Jilin, Li Jinghong, Tao Nongjian
机构信息
Center for Bioelectronics and Biosensors, Biodesign Institute, Department of Electrical Engineering, Arizona State University, Tempe, Arizona 85287, USA.
出版信息
J Am Chem Soc. 2009 Jul 29;131(29):9908-9. doi: 10.1021/ja9041862.
We have studied the electron transport behavior of electrochemically gated graphene transistors in different solutions. In an ionic liquid, we have determined the electron and hole carrier densities and estimated the concentration of charged impurities to be (1-10) x 10(12) cm(-2). The minimum conductivity displays an exponential decrease with the density of charged impurities, which is attributed to the impurity scattering of the carriers. In aqueous solutions, the position of minimum conductivity shifts negatively as the ionic concentration increases. The dependence of the transport properties on ionic concentration is important for biosensor applications, and the observation is modeled in terms of screening for impurity charges by the ions in solutions.
我们研究了电化学门控石墨烯晶体管在不同溶液中的电子输运行为。在离子液体中，我们确定了电子和空穴载流子密度，并估计带电杂质的浓度为(1 - 10)×10¹² cm⁻²。最小电导率随带电杂质密度呈指数下降，这归因于载流子的杂质散射。在水溶液中，随着离子浓度增加，最小电导率的位置向负方向移动。输运性质对离子浓度的依赖性对于生物传感器应用很重要，并且该观察结果是根据溶液中离子对杂质电荷的屏蔽作用来建模的。
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