Ion Selectivity, Current, and Water Flow Regulation in Ti<sub>3</sub>C<sub>2</sub> MXene Nanopores.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38949896.
- Also identified by DOI 10.1021/acs.nanolett.4c01892 and PMC identifier 11311525.
- Licence recorded as CC BY-NC-ND.
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Abstract
Recent years have seen a growing interest in zero-dimensional (0D) transport phenomena occurring across two-dimensional (2D) materials for their potential applications to nanopore technology such as ion separation and molecular sensing. Herein, we investigate ion transport through 1 nm-wide nanopores in Ti<sub>3</sub>C<sub>2</sub> MXene using molecular dynamics simulations. The high polarity and fish-bone arrangement of the Ti<sub>3</sub>C<sub>2</sub> MXene offer a built-in potential and an atomic-scale distortion to the nanopore, causing an adsorption preference for cations. Our observation of variable cation-specific ion selectivity and Coulomb blockade highlights the complex interplay between adsorption affinity and cation size. The cation-specific ion selectivity can induce both the ion current and electro-osmotic water transmission, which can be regulated by tailoring the ions' preferential pathways through electric field tilting. Our finding underscores the pivotal role of the atomic arrangement of MXenes in 0D ion transport and provides fundamental insight into the application of 2D material in nanopores-based technologies.