Electromagnetic interference shielding effectiveness of monolayer graphene

Abstract

We report the first experimental results on the electromagnetic interference (EMI) shielding effectiveness (SE) of monolayer graphene. The monolayer CVD graphene has an average SE value of 2.27 dB, corresponding to ~40% shielding of incident waves. CVD graphene shows more than seven times (in terms of dB) greater SE than gold film. The dominant mechanism is absorption rather than reflection, and the portion of absorption decreases with an increase in the number of graphene layers. Our modeling work shows that plane-wave theory for metal shielding is also applicable to graphene. The model predicts that ideal monolayer graphene can shield as much as 97.8% of EMI. This suggests the feasibility of manufacturing an ultrathin, transparent, and flexible EMI shield by single or few-layer graphene.

Coupling behaviors of graphene/SiO2/Si structure with external electric field

“…8,9,36 Hong et al have obtained the EMI shielding effectiveness (SE) of monolayer CVD graphene as 2.27 dB, which is seven times greater than gold film and can block ∼40% shielding of incident waves in frequency range of 2.2∼7.0 GHz. 37 Those screening lengths of 0.14 − 1.2 nm correspond to the thicknesses of 3∼4 atomic layers of carbon. Also, because of high electrical conductivity, excellent mechanical properties, light weight, and flexibility of the graphene films, the graphene-based composites have also been used as EMI shielding materials.…”

Flexible Microwave Absorber Based on Strontium Ferrite-Rubber Composite for X-Band Applications

“…The more critical and sensitive the equipment, the more important is the need to shield it.To provide a suitable solution for the EMI problem, the shielding or absorbing of the electromagnetic field is taken into account to make an electromagnetic compatibility (EMC) environment. The EMI shielding can be achieved either by reflection or absorption of interfering electromagnetic wave [1].With progressive development of wireless technology thin, flexible and broadband EM wave absorption materials have attracted considerable attention as EMI shielding through absorption mechanismto today's advanced applications due to the fact that they can absorb microwave energy [2][3].Microwave energy, when incident on a lossy dispersive material, creates heating within the material through the interactions of the electromagnetic field with the material's molecular and electronic structure [4].…”

Material Analysis and Application for Radio Frequency Electromagnetic Wave Shielding

“…There are numerous studies in the literature on electromagnetic shielding effectiveness and some of them related to our motivation can be found in [1][2][3][4][5][6][7][8][9][10][11][12][13].…”