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

Abstract

Polymer composite films containing fillers comprising quasi‐1D van der Waals materials, specifically transition metal trichalcogenides with 1D structural motifs that enable their exfoliation into bundles of atomic threads, are reported. These nanostructures are characterized by extremely large aspect ratios of up to ≈106. The polymer composites with low loadings of quasi‐1D TaSe3 fillers (<3 vol%) reveal excellent electromagnetic interference shielding in the X‐band GHz and extremely high frequency sub‐THz frequency ranges, while remaining DC electrically insulating. The unique electromagnetic shielding characteristics of these films are attributed to effective coupling of the electromagnetic waves to the high‐aspect‐ratio electrically conductive TaSe3 atomic‐thread bundles even when the filler concentration is below the electrical percolation threshold. These novel films are promising for high‐frequency communication technologies, which require electromagnetic shielding films that are flexible, lightweight, corrosion resistant, inexpensive, and electrically insulating.

Directional Electromagnetic Interference Shielding Based on Step-Wise Asymmetric Conductive Networks

“…In recent years, conductive polymer composites (CPCs) comprising polymer matrix and conductive fillers have drawn a wide of research interest and emerged as promising candidates in next-generation protection devices in terms of their superiorities such as light weight, low cost, flexibility, easy processing, and corrosion resistance [12][13][14][15]. Gu et al [16] fabricated multifunctional flexible EMI shielding silver nanowires (AgNWs)/cellulose films via vacuum filtration and hot-pressing process.…”

Robust, Multiresponsive, Superhydrophobic, and Oleophobic Nanocomposites via a Highly Efficient Multifluorination Strategy

“…With the rapid development of electronic technology, electromagnetic pollution has a serious impact on people’s lives. Therefore, materials with EMI shielding properties have attracted wide attention due to their excellent reflection or absorption properties for electromagnetic waves . The PFEP 30 matrix exhibits very poor EMI shielding performance due to the low dielectric constant of tetrafluorophenyl groups and perfluorinated long chains .…”

“…Therefore, materials with EMI shielding properties have attracted wide attention due to their excellent reflection or absorption properties for electromagnetic waves. 59 The PFEP 30 matrix exhibits very poor EMI shielding performance due to the low dielectric constant of tetrafluorophenyl groups and perfluorinated long chains. 39 For composites, electrical conductivity directly affects EMI SE and has a reference value for the electromagnetic shielding ability of materials.…”

Growth of highly conducting MoS2-xNx thin films with enhanced 1T' phase by pulsed laser deposition and exploration of their nanogenerator application

“…Transition metal chalcogenides (TMCs) have rapidly acquired the status of technology materials of interest during the past decade because of their immensely interesting application-worthy physical properties ( Jariwala et al., 2014 )( Sebastian et al., 2021 ) ( Barani et al., 2021 ) ( Zhang et al., 2019 )( Lee et al., 2017 ) ( Briggs et al., 2019 ) ( Mak et al., 2019 ), ( Shin et al., 2012 ). Amongst the various materials belonging to this class, MoS 2 has perhaps been the most investigated one in recent years, a remarkable feature of MoS 2 being its intrinsic ability to support multiple polymorphs( Acerce et al., 2017 ).…”