Krapf Diego, Quinn Bernadette M, Wu Meng-Yue, Zandbergen Henny W, Dekker Cees, Lemay Serge G
Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.
Nano Lett. 2006 Nov;6(11):2531-5. doi: 10.1021/nl0619453.
Nanometer-sized electrodes are used to probe the transport of ions in liquid by monitoring heterogeneous electrochemical reactions. We observe pronounced nonlinearities of ion flux versus concentration when transport is localized within a region smaller than 10 nm. We show that these observations cannot be explained using conventional continuum, mean-field descriptions of ionic transport. The data indicate that these deviations are caused by the high flux of charged species that is achieved at nanometer-sized electrodes.
纳米级电极用于通过监测异相电化学反应来探测液体中离子的传输。当传输局限于小于10纳米的区域时，我们观察到离子通量与浓度之间存在明显的非线性关系。我们表明，使用传统的连续介质、离子传输的平均场描述无法解释这些观察结果。数据表明，这些偏差是由纳米级电极处实现的高带电物种通量引起的。
