Phosphorus-Stabilized MXene Conductive Film Against Oxidation
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Solution Overview
Problem
Conductive MXene films experience a decrease in conductivity over time due to oxidation, and existing methods fail to maintain high initial conductivity and prevent this degradation effectively in dry films.
Innovation Solution
A conductive film comprising MXene particles with a surface modification or termination and a phosphorus atom content of 0.001% to 0.09% by mass, produced using a method involving a mixture of MXene particles and a phosphoric acid group-containing polyanion in an aqueous solvent, followed by drying, which maintains a conductivity of 2,000 S/cm or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oxidation prevention methods (polyphosphate or sodium L-ascorbate) are added to MXene dispersion, then oxidation of MXene is suppressed, but initial conductivity decreases to 1/2 or less in dry film
Solution Approach 1:
The patent changes the concentration parameter of phosphoric acid group-containing polyanion to a specific range (0.001 mol/L to 0.1 mol/L) to achieve optimal balance between oxidation prevention and conductivity maintenance. This parameter optimization resolves the contradiction by finding the precise concentration that prevents oxidation while preserving initial conductivity above 2,000 S/cm
Solution Approach 2:
The patent creates a composite system combining MXene particles with phosphoric acid group-containing polyanion in a specific configuration. The polyanion acts as a capping agent on MXene edges while maintaining conductive pathways, forming a composite structure that simultaneously achieves oxidation resistance and high conductivity
2Adaptability or versatility
If MXene is used in dry film form, then application versatility is improved, but oxidation occurs rapidly causing conductivity decrease over time
Solution Approach 1:
The patent applies preliminary protection by adding phosphoric acid group-containing polyanion to cap MXene edges before the oxidation process begins. This preliminary capping action creates a protective barrier that prevents subsequent oxidation, enabling dry films to maintain conductivity stability over extended periods while preserving application versatility
Solution Approach 2:
The phosphoric acid group-containing polyanion serves as an intermediary substance between MXene particles and the oxidizing environment. It mediates the interaction by binding to MXene edges and blocking oxygen access, thereby protecting the conductive MXene structure while allowing the dry film to be used in various applications
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The film effectively prevents oxidation and maintains high conductivity over time, with a conductivity retention rate of 95% or more over 50 days, suitable for applications in electrodes and electromagnetic shields.
Implementation Method 1
the edges of individual MXene flakes can be capped, and oxidation of MXene can be suppressed
Implementation Method 2
an aqueous colloidal suspension of MXene
Implementation Method 3
drying the mixture to obtain a conductive film
Data Source
AI summary
A conductive film that includes: particles of a layered material including one or more layers, wherein each of the one or more layers includes a layer body represented by: MmXn, wherein M is at least one metal of Group 3, 4, 5, 6, or 7, X is a carbon atom, a nitrogen atom, or a combination thereof, n is 1 to 4, m is greater than n and 5 or less, a modification or termination T is present on a surface of the layer body, where the T is at least one selected from the group consisting of a hydroxyl group, a fluorine atom, a chlorine atom, an oxygen atom, or a hydrogen atom; and a phosphorus atom in an amount of 0.001% by mass to less than 0.09% by mass.