Highly‐Efficient Ion Gating through Self‐Assembled Two‐Dimensional Photothermal Metal‐Organic Framework Membrane

Biological ion channels regulate the ion flow across cell membrane via opening or closing of the pores in response to various external stimuli. Replicating the function of high ion gating effects with artificial porous materials has been challenging. Herein, we report that the self‐assembled two‐dimensional metal‐organic framework (MOF) membrane can serve as an excellent nanofluidic platform for smart regulation of ion transport. The MOF membrane with good photothermal performance exhibits extremely high ion gating ratio (up to 104), which is among the highest values in MOF membrane nanochannels for light‐controlled ion gating reported so far. By repeatedly turning on and off the light, the nanofluidic device shows outstanding stability and reversibility that can be applied in the remote light‐switching system. This work may spark promising applications of MOF membrane with variety of stimuli responsive properties in ion sieving, biosensing, and energy conversion. A self‐assembled 2D metal‐organic framework (MOF) membrane is shown to be an excellent nanofluidic platform for the smart regulation of transverse ion transport. It exhibits extremely high ion gating ratios (up to 104) due to its good photothermal performance. This approach may lead to applications of MOF membranes which have a variety of stimuli responsive properties in ion sieving, biosensing, and energy conversion.