Scientists develop novel transparent broadband electromagnetic interference shielding materials

Phys.org  July 27, 2020 Electromagnetic interference shielding materials are visibly opaque. Researchers in China proposed and fabricated visibly transparent EMI shielding materials using an ultrathin silver layer sandwiched by oxides (SLSO) as building blocks. The structure exhibited the highest EMI shielding effectiveness (SE) of 70 dB at 27.6 GHz (>62 dB on average at 4–40 GHz) and a transmittance close to 90% at a visible wavelength of 550 nm, which is comparable with those of polyethylene terephthalate (PET) and glass substrates. The D-SLSO structure suppresses optical reflections as antireflection coatings and enhances EMI shielding via Fabry–Pérot interference. They describe other […]

The lightest shielding material in the world

EurekAlert  July 2, 2020 An international team of researchers (Switzerland, Singapore) used nanofibers of cellulose as the basis for making an aerogel which is a light, highly porous material. Cellulose fibres obtained from wood enable a wide range of chemical modifications. The composite of cellulose nanofibers and silver nanowires created ultra-light fine structures which provide excellent shielding against electromagnetic radiation. The material has a density of 1.7 milligrams per cubic centimeter, achieves more than 40 dB shielding in the frequency range of high-resolution radar radiation (8 to 12 GHz) – in other words: virtually all radiation in this frequency range […]

New tech delivers high-tech film that blocks electromagnetic interference

Science Daily  November 1, 2018 An international team of researchers (USA – New York University, Drexel University, Yale University, China) has developed and demonstrated spin spray layer‐by‐layer (SSLbL) technique to rapidly assemble Ti3C2Tx MXene‐carbon nanotube composite films for EMI shielding. The technique allows strategic combinations of nanostructured materials and polymers providing a rich platform for developing hierarchical architehttps://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201803360ctures with desirable cross‐functionalities including controllable transparency, thickness, and conductivity, as well as high stability and flexibility. They demonstrated that the films show high conductivities up to 130 S cm−1 and high specific shielding effectiveness up to 58 187 dB cm2 g−1 and […]