Exfoliated thin sheets of layered materials can readily reassemble to form a macroscopic lamellar film containing a massive array of parallel two-dimensional (2D) nanochannels. These 2D nanofluidic channels exhibit enhanced unipolar ionic conductivity with the counterions as the majority charge carriers, thus conceptually become an ionic analogue of extrinsically doped semiconductor wafers. Here we demonstrate “kirigami nanofluidics”, where ionic transport can be manipulated by tailor-cutting the shape of the film. Shapes with an asymmetric source and drain exhibit rectifying ionic currents, which is attributed to the asymmetric concentration polarization zones developed in the two reservoirs. Therefore, the rectification ratio can be continuously tuned simply by adjusting the relative edge sizes of the shape, or even programmed by selecting the number of source and drain branches in multi-armed shapes. Kirigami-made ionic rectifiers and resistors can be conveniently connected together to demonstrate simple AND and OR logic functions. These results demonstrate nanoscale ionic transport can be manipulated by patterning materials at the macroscopic length scale.

中文翻译：

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Kirigami纳米流体†

分层材料的剥落薄片可以很容易地重新组装，以形成宏观的层状薄膜，其中包含大量平行的二维（2D）纳米通道阵列。这些2D纳米流体通道以反离子为主要电荷载体表现出增强的单极离子电导率，因此从概念上讲成为非本征掺杂半导体晶圆的离子类似物。在这里，我们演示了“激流纳米流体”，其中可以通过裁剪膜的形状来控制离子的传输。源极和漏极不对称的形状表现出整流离子流，这归因于两个储层中形成的不对称浓度极化带。因此，只需调整形状的相对边缘尺寸，即可连续调整整流比，甚至通过选择多臂形状的源极和漏极分支的数量进行编程。Kirigami制造的离子整流器和电阻器可以方便地连接在一起，以演示简单的AND和OR逻辑功能。这些结果表明，可以通过在宏观长度尺度上对材料进行图案化来操纵纳米级离子传输。