Cao Li, Liu Xiaowei, Shinde Digambar B, Chen Cailing, Chen I-Chun, Li Zhen, Zhou Zongyao, Yang Zhongyu, Han Yu, Lai Zhiping
Division of Physical Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia.
Department of Chemistry and Biochemistry, North Dakota State University, Fargo, ND, 58102, USA.
Angew Chem Int Ed Engl. 2022 Feb 1;61(6):e202113141. doi: 10.1002/anie.202113141. Epub 2021 Dec 18.
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 ≈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.
纳米流体离子传输在生物传感和能量转换应用中极具前景。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。在此，我们展示了基于具有垂直排列纳米通道阵列的定向二维共价有机框架（2D COF）膜的智能纳米流体装置，与传统单通道纳米流体装置相比，其离子通量提高了2 - 3个数量级。对于浓度高达0.01 M的电解质，表面电荷控制的离子电导起主导作用。此外，由于亚胺和酚羟基具有可定制的pH响应性，COF - DT膜实现了可主动调节的离子传输，其高pH门控开/关比约为100。COF材料可定制的结构和丰富的化学性质将为制造具有可修改离子/分子传输特性的纳米流体装置提供一个有前景的平台。
