Graphene EMI shielding film keeps 99% of its shielding after 400,000 folds

Researchers at the Korea Institute of Industrial Technology (KITECH), Hanyang University and several other institutions in South Korea have developed a flexible electromagnetic interference (EMI) shielding film made from graphene nanoplatelets that, the team says, keeps nearly all of its shielding after 400,000 folds. After the folding test, at a 3 mm radius and 60 cycles per minute, the film retained 99.4% of its shielding effectiveness (49.1 dB) and 97.9% of its electrical conductivity, with no visible cracks.

The film before and after 400,000 folding–unfolding cycles. The researchers report no visible cracks. Credit: Kim et al. (2026).

The film is about 100 µm thick. The team reports shielding of around 49–50 dB in the X-band (8.2–12.4 GHz), which means it blocks the large majority of incoming electromagnetic energy, and an electrical conductivity of over 12,000 S/m. Shielding is reflection-dominated, with over 90% of the incident waves reflected. The researchers say the folding endurance exceeds that of previously reported flexible EMI shielding materials.

The film before and after 400,000 folding–unfolding cycles. The researchers report no visible cracks. Credit: Kim et al. (2026).The film is about 100 µm thick. The team reports shielding of around 49–50 dB in the X-band (8.2–12.4 GHz), which means it blocks the large majority of incoming electromagnetic energy, and an electrical conductivity of over 12,000 S/m. Shielding is reflection-dominated, with over 90% of the incident waves reflected. The researchers say the folding endurance exceeds that of previously reported flexible EMI shielding materials.

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