Voltage-Gated Ion Transport in Two-Dimensional Sub-1-Nanometer Nanofluidic Channels.
Voltage-Gated Ion Transport in Two-Dimensional Sub-1-Nanometer Nanofluidic Channels.
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DOI：
10.1021/acsnano.9b05758
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发表时间：
2019-09
期刊：
影响因子：
17.1
通讯作者：
Yuqi Wang;Huacheng Zhang;Yuan Kang;Yinlong Zhu;G. Simon;Huanting Wang
中科院分区：
文献类型：
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作者：
Yuqi Wang;Huacheng Zhang;Yuan Kang;Yinlong Zhu;G. Simon;Huanting Wang
电压门控纳米流体系统在生物传感器、能量收集和分离等方面具有广泛的应用前景。用导电纳米片制成的二维纳米流体膜具有高的离子电导率和电压门控离子传输行为。然而，亚纳米尺寸的2D通道膜的电压门控效应还没有得到很好的研究。在这项工作中，一个高性能的电压门控二维纳米流体装置是通过组装MXene纳米片到一个层状膜与亚1纳米的层间通道。通过向膜施加外部电压，装置的离子电导率通过正电压增强并通过负电压降低，表现出约10的高电压门控通断比。发现开关比取决于离子浓度和离子种类。这项工作表明，具有与水合离子直径相当的层间间距的2D膜可以实现高且可调的电压门控功能，这提供了一种构建高效按需离子传输装置的策略。
Voltage-gated nanofluidic systems have shown a wide range of potential applications in biosensors, energy harvest and separation. Two-dimensional (2D) nanofluidic membranes fabricated with electrically conductive nanosheets have high ion conductivity and voltage-gated ion transport behaviors. However, the voltage-gating effect of the sub-nanometer-sized 2D channel membranes has not been well investigated. In this work, a high-performance voltage-gated 2D nanofluidic device is constructed by assembling MXene nanosheets into a laminar membrane with sub-1-nm interlayer channels. By applying external voltage to the membrane, the ion conductivity of the device is enhanced by positive voltages and reduced by negative voltages, exhibiting a high voltage-gating on-off ratio of ~10. The on-off ratio is found to be dependent on ion concentration and ion species. This work demonstrates that 2D membranes with interlayer spacings comparable to hydrated ion diameters can achieve high and tunable voltage-gating function, which provides a strategy to construct devices for highly efficient on-demand ion transport.