Asymmetrical MAX Phase and MXene for Tunable Functional Properties
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Solution Overview
Problem
Existing MXenes and MAX phases lack asymmetrical out-of-plane ordering, limiting their application in advanced technologies requiring tailored semiconductive, magnetic, and photocatalytic properties.
Innovation Solution
Manufacture a MAX phase with asymmetrical out-of-plane ordering by mixing transition metals and adjusting the atomic radii difference between elements in the outer layers, followed by etching to obtain an asymmetrical MXene with tunable semiconductive and magnetic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If symmetrical out-of-plane-ordered MAX phases (M''2M'AX2 or M''2M'2AX3) are manufactured, then structural stability is achieved, but the MXene lacks tailored semiconductive, magnetic, and photocatalytic properties
Solution Approach 1:
The patent applies asymmetry by designing a MAX phase with different outer transition metal layers (M''1 and M''2) instead of identical symmetric layers. This asymmetrical configuration (M''1M'M''2MXn) enables tailored semiconductive, magnetic, and photocatalytic properties while maintaining structural stability through the ordered arrangement of different metal elements in specific positions.
Solution Approach 2:
The patent implements local quality by assigning different transition metal elements to specific layers (central M' layer and outer M''1/M''2 layers) to create localized functional properties. This allows different regions of the material to exhibit different characteristics, enabling tailored semiconductive, magnetic, and photocatalytic behaviors in specific layers while maintaining overall structural integrity.
2Adaptability or versatility
If transition metals are mixed to control MXene characteristics, then functional properties are improved, but the manufacturing precision of the MAX phase structure deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-selecting and arranging specific transition metal elements in predetermined layers before etching to form the MXene. The MAX phase is manufactured with precise asymmetrical ordering of M''1M'M''2 layers, which then translates to the desired functional properties in the final MXene product, ensuring both manufacturing precision and functional performance.
Solution Approach 2:
The patent uses composite materials by combining multiple transition metal elements (M''1, M’, M''2) in a structured asymmetrical configuration. This composite approach allows the material to exhibit multiple functional properties (semiconductive, magnetic, photocatalytic) simultaneously while maintaining structural order through the defined layering sequence, resolving the contradiction between mixing metals and manufacturing precision.
Data Source
AI summary
A MAX phase has a layered structure of M(n+1)AXn including a plurality of transition metal layers (where n is a natural number, and n and n+1 represent a number of layers). M includes at least two transition metal elements. X includes nitrogen or carbon. A includes at least a first element and a second element, which are different from each other and selected from a Group 13 element, a Group 14 element, a Group 15 element, and a Group 16 element. A difference in atomic radii of the first element and the second element is greater than or equal to 0.1 Å. A first transition metal layer and a second transition metal layer corresponding to opposite outer layers among the transition metal layers have different compositions so that the MAX phase and a MXene obtained from the MAX phase have an asymmetrical out-of-plane-ordered structure.