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Switchable Ion Current Saturation Regimes Enabled via Heterostructured Nanofluidic Devices Based on Metal-Organic
Gregorio Laucirica1, Juan A Allegretto1, Michael F Wagner2
1Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET, CC 16 Suc. 4, La Plata, B1904DPI, Argentina.
Advanced Materials (Deerfield Beach, Fla.)
|October 14, 2022
Summary
This study introduces a novel nanochannel device modified with UiO-66 metal-organic frameworks (MOFs). The unique MOF structure creates an asymmetric ion current, tunable by pH, for advanced nanofluidic applications.
Area of Science:
- Nanofluidics
- Materials Science
- Chemical Engineering
Background:
- Track-etched membranes offer tunable transport properties for sensing and energy applications.
- Metal-organic frameworks (MOFs) enhance membrane capabilities.
- Combining MOFs with nanochannels presents new opportunities in nanofluidics.
Purpose of the Study:
- To create a single track-etched nanochannel modified with UiO-66 MOF.
- To investigate the impact of MOF heterostructure on nanofluidic transport.
- To explore the tunability and stability of the modified nanochannel's iontronic output.
Main Methods:
- Interfacial growth method for UiO-66 synthesis within a nanochannel.
- Fabrication of a single track-etched nanochannel.
- Characterization of ion transport under varying transmembrane voltages, pH, and salt concentrations.
Main Results:
- UiO-66 completely and smoothly filled the nanochannel, forming an axial heterostructure.
- The MOF heterostructure induced asymmetric ion current saturation above 0.3 V.
- The iontronic behavior was reversible with pH changes and stable across various KCl concentrations.
Conclusions:
- The constructional porosity of the MOF, not just its intrinsic microporosity, dominates the nanochannel's functionality.
- The modified nanochannel exhibits tunable iontronic properties suitable for sensing and energy applications.
- This work highlights the importance of MOF growth morphology in designing advanced nanofluidic devices.
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