MXene Composite Materials for Tunable Electronic and Mechanical Properties
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Solution Overview
Problem
There is a limited number of non-oxide, two-dimensional, atomically-scaled layered solids available, with graphene being the most studied but having limitations due to its simple chemistry and weak van der Waals bonding, which restricts its applications beyond composite reinforcement and electronics.
Innovation Solution
Development of compositions comprising stacked assemblies of two-dimensional crystalline solids with an empirical formula of M n+1 X n, where M is a Group IIIB, IVB, or VIB metal, and X is C or N, along with methods to prepare these materials by removing A atoms from MAX-phase compositions, resulting in MXene materials that can be used as free-standing layers or stacked assemblies with surface modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If graphene is used as a 2-D material, then it provides good mechanical strength and electrical conductivity, but its simple chemistry and weak van der Waals bonding limit its application versatility
Solution Approach 1:
The patent applies composite materials by combining transition metal carbides, nitrides, or carbonitrides with polymer matrices to create MXene-based composite materials. These composites leverage the unique properties of MXenes (high surface area, tunable surface chemistry, electrical conductivity) while maintaining polymer flexibility and processability, thereby achieving enhanced application versatility beyond what pure graphene can provide
Solution Approach 2:
The patent employs parameter changes by systematically varying the transition metal element (M), the A-group element (A), and the stoichiometric ratio (n) in the MAX phase precursor materials. This allows tuning of the resulting MXene properties including surface area, interlayer distance, surface chemistry, and electrical conductivity, enabling optimization for specific applications while maintaining structural stability
2Adaptability or versatility
If MAX-phase materials are used as precursors to produce MXene, then a wide range of compositions and properties can be achieved, but the synthesis and processing complexity increases
Solution Approach 1:
The patent applies preliminary action by first synthesizing the MAX phase precursor materials with controlled compositions and structures before performing the acid etching process to produce MXene. This pre-preparation of ordered layered precursors with specific M-A-X stoichiometries allows systematic control over the final MXene properties while streamlining the subsequent exfoliation process
Solution Approach 2:
The patent employs extraction by selectively removing the A-group element layers from the MAX phase precursor through acid etching processes. This extraction of specific layers from the layered precursor structure enables the formation of pure MXene (M n+1 X n) with controlled composition and structure, achieving composition tunability through selective removal rather than direct synthesis
3Reliability
If 2-D layered structures are exfoliated from 3-D bulk materials, then unique 2-D properties are achieved, but the number of available non-oxide materials is limited
Solution Approach 1:
The patent applies universality by demonstrating that the MAX phase to MXene exfoliation pathway can be applied across a broad family of materials with different transition metals (M), A-group elements (A), and stoichiometric ratios (n). This universal approach enables access to numerous non-oxide 2-D materials beyond graphene, each with tunable properties for different applications including energy storage, catalysis, and composite reinforcement
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 MXene materials exhibit enhanced properties such as tunable electronic structure, improved mechanical strength, and capability for intercalation of ions, making them suitable for energy storage devices and composite reinforcement beyond what graphene can offer.
Implementation Method 1
removing substantially all of the A atoms from a MAX-phase composition
Data Source
Figure 1(A)~1(C)
Figure 2(A)~2(B)
Figure 3(a)~3(c)
AI summary
The present invention is directed to compositions comprising free standing and stacked assemblies of two dimensional crystalline solids, and methods of making the same.