Graphene Transparent Conductive Articles for RF Shielding
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Solution Overview
Problem
Conventional infrared and visible light transparent materials are susceptible to electromagnetic interference and detection due to their insulating nature, particularly in the radio frequency band, and existing solutions like metal meshes degrade optical performance and are prone to environmental damage.
Innovation Solution
Incorporating one or more layers of graphene into optical materials to create articles that transmit infrared and visible radiation while inhibiting radio frequency radiation, enhancing electrical conductivity and thermal conductivity, and reducing susceptibility to environmental damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal mesh or grid is applied to the surface of an optical material to provide low radio frequency transmission, then radio frequency transmission is reduced, but optical transmission is degraded and the material becomes more susceptible to environmental damage
Solution Approach 1:
The patent changes the material parameter from conventional metal to graphene, which has fundamentally different electrical and optical properties. Graphene's unique two-dimensional structure and electron mobility allow it to block radio frequencies while maintaining optical transparency, resolving the contradiction between RF shielding and optical transmission
Solution Approach 2:
The patent creates a composite structure by integrating graphene layers with optical materials such as zinc sulfide or zinc selenide. This composite approach combines the RF shielding capability of graphene with the optical transparency of the base material, achieving both reduced radio frequency transmission and maintained optical performance
2Object-affected harmful factors
If a metal mesh is applied to provide electromagnetic shielding, then radio frequency transmission is inhibited, but the metal reacts with or diffuses into the optical material degrading performance
Solution Approach 1:
The patent replaces durable metal coatings with graphene layers that are applied as thin films through deposition processes. While graphene itself is stable, the application method avoids the chemical reactions and diffusion problems associated with metal coatings, eliminating the composition stability issue
Solution Approach 2:
The patent uses graphene as an intermediary material between the optical material and the external environment. Graphene provides electromagnetic shielding without the chemical reactivity of metals, and can be applied through intermediate deposition processes that prevent direct contact and reaction between the shielding layer and optical material
3Object-affected harmful factors
If fine metal grids are applied close to the surface to reflect microwave radiation, then radio frequency shielding is improved, but uniformity is difficult to ensure and environmental damage risk increases
Solution Approach 1:
The patent replaces mechanical grid structures with continuously deposited graphene layers. Instead of applying discrete metal wires or meshes that require precise mechanical positioning, graphene is deposited as a uniform thin film through vapor deposition or other deposition techniques, eliminating uniformity issues associated with mechanical grid application
Solution Approach 2:
The patent changes the structural parameter from discrete grid elements to continuous thin film structure. This parameter change in the shielding layer morphology, combined with controlled deposition parameters, ensures uniform coverage and consistent electromagnetic shielding performance across the entire optical material surface
4Object-affected harmful factors
If optical materials are made electrically conducting to address interference, then electromagnetic shielding is improved, but transmission in visible and infra-red regions must be maintained
Solution Approach 1:
The patent changes the electrical conductivity parameter of the optical material by introducing graphene, which has high electron mobility and conductivity. This parameter change enables electromagnetic shielding while the unique optical properties of graphene maintain transmission in the visible and infra-red spectral regions
Solution Approach 2:
The patent creates a composite material system where graphene provides electrical conductivity for electromagnetic shielding, while the base optical material (zinc sulfide, zinc selenide, etc.) maintains optical transparency. The synergistic combination of these materials achieves both shielding and transmission requirements
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 graphene-based articles achieve high electrical conductivity, improved thermal management, and reduced susceptibility to environmental damage, facilitating ice removal in cold environments and maintaining optical transmission with minimal radio frequency transmission.
Implementation Method 1
Articles include one or more layers of graphene, the articles transmit in the infrared and visible regions of the electromagnetic spectrum and inhibit incident radio frequency radiation
Implementation Method 2
the articles have high electrical conductivity... The relatively high electrical conductivity in the articles facilitates ice removal when they are operated in cold environments
Implementation Method 3
Graphene films have high thermal conductivity. Accordingly, articles made with graphene layers near their surfaces or distributed throughout the articles can be used in high thermal shock environments to dissipate heat to the edges
Data Source
AI summary
Articles with graphene are selectively transparent to electromagnetic radiation. The articles transmit electromagnetic radiation in the infrared and visible light bands while inhibiting incident radio frequency radiation. The articles have high electrical conductivity and may be used in windows and domes.