Ordered 2D Double-Metal Carbides for Stronger Conductive Layers
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Solution Overview
Problem
Current 2D materials, such as graphene, have limitations due to their simple chemistry and weak van der Waals bonding, which restricts their applications beyond composite reinforcement and electronics.
Innovation Solution
Development of novel ordered nano-laminate metal carbide compositions with the stoichiometry M′2M″nXn+1, where M′ and M″ are different Group IIIB, IVB, VB, or VIB metals, and X is C, N, or a combination thereof, forming a two-dimensional array of crystal cells with specific surface terminations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If graphene and simple 2D materials are used, then high specific surface area is achieved, but chemical complexity and bonding strength are limited
Solution Approach 1:
The patent employs composite materials by creating 2D metal carbides with dual metal elements (M1 and M2) in a layered structure. The composition M1-xM2xMX2 combines different metal elements to achieve both high surface area and enhanced chemical complexity, allowing tailored electronic and structural properties that single-element materials cannot provide.
Solution Approach 2:
The invention applies local quality by positioning different metal elements (M1 and M2) at specific locations within the crystal structure. The parameter x controls the local composition, enabling spatial variation of electronic properties while maintaining the overall 2D layered structure and high surface area.
2Shape
If graphene with weak van der Waals bonding is used, then 2D structure is achieved, but structural strength and stability are limited
Solution Approach 1:
The patent strengthens the 2D structure by creating composite metal carbides with strong covalent bonding within layers. The M-X bonds in the 2H polytype structure provide intrinsic structural strength, while the layered architecture maintains the 2D morphology needed for high surface area applications.
3Ease of manufacture
If simple 2D materials are used, then ease of manufacture is improved, but electronic and structural properties are limited
Solution Approach 1:
The invention utilizes parameter changes by controlling the composition parameter x in the range 0 < x < 1 to tune electronic properties. This allows optimization of electrical conductivity and other electronic characteristics while maintaining a relatively simple synthesis approach based on established MAX phase preparation methods.
Data Source
AI summary
The present disclosure is directed to compositions comprising at least one layer having first and second surfaces, each layer comprising: a substantially two-dimensional array of crystal cells, each crystal cell having an empirical formula of M′2M″nXn+1, such that each X is positioned within an octahedral array of M′ and M″; wherein M′ and M″ each comprise different Group 11113, WE, VB, or VIB metals; each X is C, N, or a combination thereof; n=1 or 2; and wherein the M′ atoms are substantially present as two-dimensional outer arrays of atoms within the two-dimensional array of crystal cells; the M″ atoms are substantially present as two-dimensional inner arrays of atoms within the two-dimensional array of crystal cells; and the two dimensional inner arrays of M″ atoms are sandwiched between the two-dimensional outer arrays of M′ atoms within the two-dimensional army of crystal cells.