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.
Source: https://www.graphene-info.com/graphene-emi-shielding-film-keeps-99-its-shielding-after-400000-folds
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