Oriented Two-Dimensional Covalent Organic Framework Membranes with High Ion Flux and Smart Gating Nanofluidic Transport
Oriented Two-Dimensional Covalent Organic Framework Membranes with High Ion Flux and Smart Gating Nanofluidic Transport
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DOI：
10.1002/anie.202113141
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发表时间：
2021-12-18
影响因子：
16.6
通讯作者：
Lai, Zhiping
中科院分区：
文献类型：
--
作者：
Cao, Li;Liu, Xiaowei;Lai, Zhiping
纳米流体离子传输在生物传感和能量转换应用中具有很高的前景。然而，具有高离子通量和可调节离子传输能力的智能纳米流体装置仍有待实现。在这里，我们展示了智能纳米流体设备的基础上定向二维共价有机框架（2D COF）膜与垂直对齐的纳米通道阵列，实现了2-3个数量级的离子通量比传统的单通道纳米流体设备。表面电荷支配的离子电导是占主导地位的电解质浓度高达0.01 M。此外，由于亚胺和酚羟基的可定制的pH响应性，COF-DT膜获得了具有接近100的高pH门控开/关比的可主动调节的离子传输。COF材料的可定制结构和丰富的化学性质将为制造具有可改变的离子/分子传输特性的纳米流体设备提供有前途的平台。
Nanofluidic ion transport holds high promise in bio-sensing and energy conversion applications. However, smart nanofluidic devices with high ion flux and modulable ion transport capabilities remain to be realised. Herein, we demonstrate smart nanofluidic devices based on oriented two-dimensional covalent organic framework (2D COF) membranes with vertically aligned nanochannel arrays that achieved a 2-3 orders of magnitude higher ion flux compared with that of conventional single-channel nanofluidic devices. The surface-charge-governed ion conductance is dominant for electrolyte concentration up to 0.01 M. Moreover, owing to the customisable pH-responsivity of imine and phenol hydroxyl groups, the COF-DT membranes attained an actively modulable ion transport with a high pH-gating on/off ratio of approximate to 100. The customisable structure and rich chemistry of COF materials will offer a promising platform for manufacturing nanofluidic devices with modifiable ion/molecular transport features.