High-performance hierarchical graphene/metal-mesh film for optically transparent electromagnetic interference shielding

• Published in: Carbon (New York) Vol. 115; pp. 34 - 42
• Main Authors: Han, Yu, Liu, Yuxuan, Han, Lin, Lin, Jie, Jin, Peng
• Format: Journal Article
• Language: English
• Published: New York Elsevier Ltd 01-05-2017; Elsevier BV
• Subjects: Absorption; Absorptivity; Aeronautics; Aviation; Camcorders; Corrosion resistance; Cracking (chemical engineering); Diffraction; Electromagnetic interference; Electromagnetic shielding; Graphene; Haze; Infrared spectroscopy; Liftoff; Optical properties; Optoelectronic devices; Protective coatings; Quartz; Reflectance; Touch control panels; Transmittance
• ISSN: 0008-6223; 1873-3891
• DOI: 10.1016/j.carbon.2016.12.092

This work first demonstrates the improved electromagnetic interference (EMI) shielding performance of monolayer graphene on highly transparent metal-meshes of random pattern. Metal-meshes are fabricated on quartz substrate by lift-off based on self-cracking template and CVD graphene is directly transferred onto thin metal-meshes to construct the hierarchical graphene/metal-mesh film, by which considerable improvements both in microwave reflection and absorption can be realized in thin metal-meshes. The shielding effectiveness (SE) of the hierarchical film even exceeds the summation of those of the monolayer graphene and the metal-mesh film. Detailed analyses reveal that absorption dominates the improvement in SE for a graphene/50 nm Ag-mesh film, with a three-fold absorption coefficient as well as a slightly increased reflectivity compared to the Ag-mesh itself. The as-prepared hierarchical film primely inherits the excellent optical transmission properties from random-pattern metal-meshes with high transmittance in visual-IR spectrum, low haze and faint diffraction. Moreover, the chemical stability of metal-meshes is highly improved with the protection of graphene. We anticipate that the hierarchical graphene/metal-mesh film can be a promising material to play a great role in realization of high-performance EMI shielding in emerging optoelectronic devices such as touch panels, displays, airborne optoelectronic pods, and aviation camcorders.
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