Graphene Core-Shell EMI Suppressing Material for Wave Absorption
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Solution Overview
Problem
Existing electromagnetic interference suppressing materials fail to adequately reduce electromagnetic failure in advanced communication devices, and methods involving reflection can cause autointoxication, necessitating improved electromagnetic wave absorption and interference suppression.
Innovation Solution
An electromagnetic interference suppressing material comprising a base material with organic and/or inorganic substances and a carbon composite material, specifically core-shell particles or connected bodies coated with graphene layers of 4 or less, offering high electromagnetic wave absorption and interference suppression performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal or conventional materials are used for electromagnetic wave blocking by reflection, then electromagnetic wave blocking performance is improved, but autointoxication occurs and electromagnetic failure reduction performance deteriorates
Solution Approach 1:
The patent converts the harmful effect of electromagnetic wave reflection into beneficial absorption. By using a carbon composite material with specific graphene content (0.01-30 mass%) dispersed in a polymer matrix, the material absorbs electromagnetic waves through dielectric loss and conductive loss mechanisms, transforming the harmful reflected waves into heat energy that can be dissipated, thereby eliminating autointoxication while maintaining blocking performance
Solution Approach 2:
The patent employs a composite material system consisting of carbon composite particles (with core-shell or aggregated structures), graphene sheets, and a polymer matrix. This composite structure combines the advantages of different materials: the carbon composite provides electromagnetic wave absorption, graphene enhances conductivity and absorption efficiency, and the polymer matrix provides structural stability. The synergistic effect achieves superior electromagnetic interference suppression without causing autointoxication
2Object-affected harmful factors
If conventional electromagnetic shielding materials are used, then electromagnetic wave blocking is achieved, but electromagnetic failure reduction performance is insufficient for advanced communication devices
Solution Approach 1:
The patent optimizes critical parameters of the carbon composite material to enhance electromagnetic failure reduction performance. Key parameters include: graphene content (0.01-30 mass%) to control conductivity and absorption; particle size distribution (0.1-100 μm) to optimize wave interaction; and carbon composite content (10-90 mass%) to balance absorption efficiency and mechanical properties. These parameter optimizations enable the material to effectively suppress electromagnetic failures in advanced communication devices operating at higher frequencies
Solution Approach 2:
The patent creates local quality variations within the shielding material by incorporating carbon composite particles with different sizes, shapes, and graphite crystallinity levels. This heterogeneous structure provides multiple relaxation mechanisms for electromagnetic wave energy dissipation at different locations and frequencies, enhancing the overall reliability and broadband absorption capability of the material
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 material achieves enhanced electromagnetic wave absorption, interference suppression, and reduced electromagnetic failure, with improved thermal conductivity and thermal expansion properties, eliminating the need for additional heat dissipation mechanisms and reducing device size and weight.
Implementation Method 1
a carbon composite material, in which the carbon composite material includes at least one selected from the group consisting of a core-shell particle and a core-shell connected body, the core-shell particle including an inorganic particle in which a surface of the inorganic particle is coated with a coating layer composed of graphene having an average number of layers of 4 or less
Implementation Method 2
the electromagnetic interference suppressing material has a volume resistance of 10³ Ω·cm or more
Implementation Method 3
a coating layer composed of graphene having an average number of layers of 4 or less
Implementation Method 4
the inorganic particle contained in the core-shell particle and the inorganic particles contained in the core-shell connected body contain at least one selected from the group consisting of alumina, silica, magnesium oxide, tungsten carbide, and aluminum nitride
Data Source
AI summary
An electromagnetic interference suppressing material includes: a base material containing at least one selected from the group consisting of an organic substance and an inorganic substance; and a carbon composite material. The carbon composite material includes at least one selected from the group consisting of a core-shell particle and a core-shell connected body, where the core-shell particle includes an inorganic particle in which a surface of the inorganic particle is coated with a coating layer composed of graphene having an average number of layers of 4 or less, and the core-shell connected body includes a connected body of inorganic particles in which a surface of the connected body of inorganic particles is coated with a coating layer of graphene having an average number of layers of 4 or less, and the electromagnetic interference suppressing material has a volume resistance of 103 Ω·cm or more.