MXene Films and Composites for Lightweight EMI Shielding
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Solution Overview
Problem
Current electromagnetic interference (EMI) shielding materials, such as metal shrouds, are heavy and costly, and polymer-matrix composites with conductive fillers do not provide high enough EMI shielding effectiveness for modern, compact electronic devices.
Innovation Solution
The use of two-dimensional transition metal carbides, nitrides, and carbonitrides, specifically MXene films and MXene-polymer composites, which are applied as coatings to objects to provide high EMI shielding due to their exceptional electrical conductivity and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal shrouds are used for EMI shielding, then EMI shielding effectiveness is improved, but weight and cost increase
Solution Approach 1:
The patent changes the material parameters from traditional metals to two-dimensional transition metal carbides (MXenes), which have comparable or superior electrical conductivity but significantly lower density. This parameter change allows achieving high EMI shielding effectiveness while reducing weight.
Solution Approach 2:
The patent employs composite material structures, specifically MXene-polymer composites and multilayer MXene configurations, which combine the high conductivity of MXenes with the mechanical properties of polymers, achieving effective EMI shielding with reduced weight compared to solid metal shrouds.
2Reliability
If metal shrouds are used for EMI shielding, then EMI shielding effectiveness is improved, but cost increases
Solution Approach 1:
The patent substitutes expensive metals with MXene materials that offer similar or better electrical conductivity at lower cost, particularly when used in thin-film and composite configurations that reduce material quantity requirements.
Solution Approach 2:
The patent utilizes thin-film MXene coatings and flexible composite structures that provide effective EMI shielding with minimal material consumption, significantly reducing the quantity of substance required compared to traditional metal shrouds and thereby reducing cost.
3Weight of moving object
If polymer-matrix composites with conductive fillers are used, then weight is reduced, but EMI shielding effectiveness is insufficient
Solution Approach 1:
The patent changes the conductive filler material from traditional particles to two-dimensional MXene sheets, which have superior electrical conductivity and aspect ratio, enabling effective EMI shielding at lower filler loadings and thus maintaining weight reduction while improving shielding effectiveness.
Solution Approach 2:
The patent optimizes the composite material structure by using MXene-polymer composites with specific configurations that enhance the conductive network formation, achieving both lightweight properties and high EMI shielding effectiveness that traditional conductive filler composites cannot achieve.
4Reliability
If traditional EMI shielding materials are used, then EMI shielding is provided, but device size and complexity increase
Solution Approach 1:
The patent employs ultra-thin MXene films and coatings that provide effective EMI shielding in minimal thickness, integrating seamlessly into compact electronic devices without adding significant size or complexity.
Solution Approach 2:
The patent uses integrated MXene-polymer composite structures that combine shielding functionality with structural components, reducing the need for separate shielding elements and thereby decreasing overall device complexity and size.
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
These materials achieve unexpectedly high EMI shielding effectiveness, outperforming most known materials except pure metals, with specific compositions like Ti3C2Tx and Mo2TiC2 exhibiting EMI shielding values up to 92 dB and 27 dB respectively, effectively blocking electromagnetic interference across a wide frequency range.
Implementation Method 1
The majority of MXenes have very high metallic conductivities... exceptional electrical conductivity... coating comprising a two-dimensional transitional metal carbide, nitride, or carbonitride composition having electrically conductive surfaces
Data Source
AI summary
The present disclosure is directed to materials which provide electromagnetic shielding and methods of providing such electromagnetic shielding. In particular, the present disclosure describes the use of two-dimensional transition metal carbide, nitride, and carbonitride materials for this purpose.