Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697, USA.
Phys Rev Lett. 2009 Dec 11;103(24):248104. doi: 10.1103/PhysRevLett.103.248104. Epub 2009 Dec 9.
We report a single rectifying conically shaped nanopore system with ion current fluctuations whose 1/f noise characteristics observed at low frequencies are voltage dependent. Switching the voltage polarity allows one to switch between a system that produces equilibrium and nonequilibrium 1/f ion current fluctuations. The nonequilibrium fluctuations in the high-conductance state of the device are characterized by exponential dependence of the normalized power spectrum on voltage. The asymmetric 1/f noise is found characteristic for rectifying polymer nanopores and absent in pores with Ohmic current-voltage curves.
我们报告了一个具有离子电流波动的单一整流圆锥形纳米孔系统，其在低频下观察到的 1/f 噪声特性与电压有关。切换电压极性可以在产生平衡和非平衡 1/f 离子电流波动的系统之间进行切换。在器件的高电导状态下，非平衡波动的归一化功率谱与电压呈指数关系。这种不对称的 1/f 噪声是整流聚合物纳米孔的特征，而在具有欧姆电流-电压曲线的孔中则不存在。
