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Core-multishell heterostructure with excellent heat dissipation for electromagnetic interference shielding.

Research paper by Yudhajit Y Bhattacharjee, Dipanwita D Chatterjee, Suryasarathi S Bose

Indexed on: 15 Aug '18Published on: 15 Aug '18Published in: ACS Applied Materials & Interfaces



Abstract

Herein, we report high electromagnetic interference (EMI) shielding effectiveness of -40 dB in the Ku- band (for a 600 µm thick film) through unique core-shell hetereostructure consisting of a ferritic core (Fe3O4) and a conducting shell (multiwalled carbon nanotubes, MWCNT) supported onto a dielectric spacer (here SiO2). In recent times, materials with good flexibility, heat dissipating ability and sustainability together with efficient EMI shielding at minimal thickness is highly desirable; especially if they can be easily processed into thin films. The resulting composites here shielded EM radiation mostly through absorption driven by multiple interfaces provided by the heterostructure. The shielding value obtained here is fairly superior among the different polymer nanocomposite based EMI shielding material. In addition to EMI shielding capability, this composite material exhibits outstanding heat dissipation ability (72ºC to room temperature in less than 90 s) as well as high heat sustainability. The composite material retained its EMI shielding property even after repeated heat cycles thereby opening new avenues in the design of lightweight, flexible and sustainable EMI shielding material.