离子
石墨烯
选择性
二价
材料科学
纳米孔
纳米技术
离子运输机
电压
化学物理
光电子学
化学
量子力学
生物化学
物理
催化作用
有机化学
冶金
作者
Shihao Su,Yifan Zhang,Shengyuan Peng,Linxin Guo,Yong Liu,Engang Fu,Huijun Yao,Jinlong Du,Guohao Du,Jianming Xue
标识
DOI:10.1038/s41467-022-32590-9
摘要
Abstract Ion-selective nanoporous two-dimensional (2D) materials have shown extraordinary potential in energy conversion, ion separation, and nanofluidic devices; however, different applications require diverse nanochannel devices with different ion selectivity, which is limited by sample preparation and experimental techniques. Herein, we develop a heterogeneous graphene-based polyethylene terephthalate nanochannel (GPETNC) with controllable ion sieving to overcome those difficulties. Simply by adjusting the applied voltage, ion selectivity among K + , Na + , Li + , Ca 2+ , and Mg 2+ of the GPETNC can be immediately tuned. At negative voltages, the GPETNC serves as a mono/divalent ion selective device by impeding most divalent cations to transport through; at positive voltages, it mimics a biological K + nanochannel, which conducts K + much more rapidly than the other ions with K + /ions selectivity up to about 4.6. Besides, the GPETNC also exhibits the promise as a cation-responsive nanofluidic diode with the ability to rectify ion currents. Theoretical calculations indicate that the voltage-dependent ion enrichment/depletion inside the GPETNC affects the effective surface charge density of the utilized graphene subnanopores and thus leads to the electrically controllable ion sieving. This work provides ways to develop heterogeneous nanochannels with tunable ion selectivity toward broad applications.
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