亚纳米孔中离子电导振荡的光电控制探测
Ionic conductance oscillations in sub-nanometer pores probed by optoelectronic control
摘要：
离子库仑阻塞是离子输运过程中的一种介观效应，它揭示了离子电荷的量子化本质，对于理解纳米流体中的亚连续输运和生物离子通道的机理具有重要意义。在这里，我们报告了离子传导振荡的实验观察和合理的理论推理。我们的实验在单个亚纳米MoS2孔中的强约束下进行，其中光电控制使得能够对孔表面电荷进行主动调谐。在这种电荷控制下，我们在固定电压下测量离子电流，并观察到多个电流峰。我们的分析讨论和分子动力学模拟进一步揭示了原子级薄纳米孔中的电导振荡可能源于孔入口处的多离子相互作用，特别是孔外离子与孔内离子的静电排斥。我们的工作为进一步理解原子级细纳米孔中极端约束下的离子库仑阻塞效应奠定了基础，并为开发先进的离子机械奠定了基础。
英文摘要：
Ionic Coulomb blockade is one of the mesoscopic effects in ion transport revealing the quantized nature of ionic charges, which is of crucial importance to our understanding of the sub-continuum transport in nanofluidics and the mechanism of biological ion channels. Herein, we report an experimental observation and plausible theoretical reasoning of ionic conduction oscillations. Our experiment was performed under strong confinement in single sub-nanometer MoS2 pores with optoelectronic control enabled for active tuning of pore surface charges. Under this charge control, we measured the ionic current at fixed voltages and observed multiple current peaks. Our analytical discussions and molecular dynamics simulations further reveal that the conductance oscillations in atomically thin nanopores may originate from the multi-ion interaction at the pore entry, particularly the electrostatic repulsion of ions external to the pore by ions bound inside the pore. Our work adds a further understanding of ionic Coulomb blockade effect under extreme confinement in atomically thin nanopores and paves the way for developing advanced ionic machineries.
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