Electromagnetic interference shielding effectiveness of monolayer graphene.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Electromagnetic interference (EMI) poses challenges in electronic devices.
• Graphene, a single layer of carbon atoms, is a promising material for advanced applications.
• Existing EMI shielding materials often lack flexibility, transparency, or are too thick.

Purpose of the Study:

• To experimentally determine the EMI shielding effectiveness (SE) of monolayer graphene.
• To compare the SE of graphene with traditional shielding materials like gold.
• To investigate the shielding mechanisms and theoretical potential of graphene-based EMI shields.

Main Methods:

• Chemical Vapor Deposition (CVD) was used to synthesize monolayer graphene.
• Experimental measurements quantified the SE of monolayer graphene.
• Comparative analysis was performed against gold film.
• Modeling based on plane-wave theory was employed to predict shielding performance.

Main Results:

• Monolayer CVD graphene achieved an average SE of 2.27 dB, shielding approximately 40% of incident waves.
• Graphene demonstrated over seven times higher SE (in dB) compared to gold film.
• Absorption was identified as the primary shielding mechanism, decreasing with more graphene layers.
• Modeling predicted ideal monolayer graphene could achieve 97.8% EMI shielding.

Conclusions:

• Monolayer graphene offers superior EMI shielding compared to gold.
• Absorption is the dominant shielding mechanism in graphene.
• Graphene's properties make it suitable for developing ultrathin, transparent, and flexible EMI shields.
• Further research into few-layer graphene could enhance shielding capabilities.