Methods of characterizing two-dimensional materials, devices comprising said materials and methods of making and use thereof
Inventors
Kidambi, Piran R. • Moehring, Nicole • Chaturvedi, Pavan
Assignees
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Publication Number
US-12553853-B2
Publication Date
2026-02-17
Expiration Date
Abstract
Disclosed herein are methods of characterizing two-dimensional materials, devices comprising said materials and methods of making and use thereof. For example, disclosed herein are methods for characterizing pore(s) and/or defect(s) in a two-dimensional (2D) material, comprising: performing electrically driven ionic transport measurements on a K+-form membrane using a first liquid electrolyte comprising KCl to determine the K+ conductance of the K+-form membrane; subsequently converting the K+-form membrane to a H+-form membrane; and performing electrically driven ionic transport measurements on the H+-form membrane using a second liquid electrolyte comprising HCl to determine the H+ conductance of the H+-form membrane; and analyzing the K+ conductance of the K+-form membrane and the H+ conductance of the H+-form membrane to determine a property of the two-dimensional material, wherein the property relates to a characteristic of the pore(s) and/or defect(s) in the two-dimensional material.
Core Innovation
The invention relates to a method for characterizing pore(s) and/or defect(s) in a two-dimensional (2D) material. The method performs electrically driven ionic transport measurements on a K+-form membrane to determine K+ conductance, where the K+-form membrane comprises the 2D material sandwiched between a first ionomer and a second ionomer, and each ionomer is in a K+-form.
After the K+-form measurements, the K+-form membrane is converted to an H+-form membrane while maintaining the two-dimensional material sandwiched between the first ionomer and the second ionomer. The H+-form membrane comprises the first ionomer and the second ionomer each in an H+-form, and the method then performs electrically driven ionic transport measurements using a second liquid electrolyte comprising HCl to determine H+ conductance.
The invention determines a property of the 2D material by analyzing the K+ conductance and the H+ conductance, where the property relates to a characteristic of the pore(s) and/or defect(s) in the 2D material. In the described resistance-based ionic transport modeling context, differences in measured H+ and K+ conductance and selectivity are attributed to contributions from nanometer-scale defects and larger graphene tears.
Claims Coverage
The provided materials include one independent claim. The claim covers a K+-form to H+-form conversion workflow with electrically driven ionic transport measurements, followed by analysis of K+ and H+ conductances to determine a pore/defect-related property.
Dual-ion electrically driven conductance characterization for pore/defect properties
Perform electrically driven ionic transport measurements on a K+-form membrane using a first liquid electrolyte comprising KCl to determine K+ conductance, convert the K+-form membrane to an H+-form membrane, then perform electrically driven ionic transport measurements on the H+-form membrane using a second liquid electrolyte comprising HCl to determine H+ conductance, and analyze the K+ conductance and the H+ conductance to determine a property related to a characteristic of the pore(s) and/or defect(s) in the two-dimensional material.
Ionomer-sandwiched 2D membrane with ion-form matched ionomers
Use a K+-form membrane comprising a two-dimensional material sandwiched between a first ionomer and a second ionomer, wherein the first ionomer and the second ionomer are each in a K+-form, and after conversion use an H+-form membrane comprising the two-dimensional material sandwiched between the first ionomer and the second ionomer, wherein the first ionomer and the second ionomer are each in an H+-form.
Across the independent claim, the method is centered on measuring K+ and H+ conductance in corresponding K+-form and H+-form ionomer-supported 2D membranes, then analyzing both conductances to determine a pore/defect-related property.
Stated Advantages
Provides a way to determine a property relating to a characteristic of pore(s) and/or defect(s) in a two-dimensional material using electrical ionic transport measurements.
Documented Applications
Characterization and modeling of atomically thin monolayer CVD graphene using resistance-based ionic transport analysis to attribute measured H+ and K+ conductance/selectivity differences to nanometer-scale defects and larger graphene tears.
Use with Nafion|graphene|Nafion membranes to reproduce measured conductances and H+/K+ selectivity via selected model parameters.
Use with PCTE-supported membranes sealed by interfacial polymerization, as described in the modeling context including impact of sealing via interfacial polymerization.
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