Electrically Insulating Flexible Films with Quasi?1D van der Waals Fillers as Efficient Electromagnetic Shields in the GHz and Sub?THz Frequency Bands

We report polymer composite films containing fillers comprised of quasi-one-dimensional (1D) van der Waals materials, specifically transition metal trichalcogenides 1D structural motifs that enable their exfoliation into bundles atomic threads. These nanostructures are characterized by extremely large aspect ratios up to 10^6. The composites with low loadings quasi-1D TaSe3 (below 3 vol. %) revealed excellent electromagnetic interference shielding in the X-band GHz and EHF sub-THz frequency ranges, while remaining DC electrically insulating. unique characteristics these attributed effective coupling waves high-aspect-ratio electrically-conductive atomic-thread even when filler concentration is below electrical percolation threshold. novel promising for high-frequency communication technologies, which require flexible, lightweight, corrosion resistant, insulating inexpensive.