Advanced Functional Materials · 2015 · 844 citations · 45 references
Natural SciencesMaterials EngineeringMaterials ScienceFunctional MaterialsMaterials ChemistryNanomaterialsComposite MaterialsMicrowave MaterialsNanocompositesNanotubesShielding DesignShielding MaterialsCarbon Nanotube CompositesCarbon Nanotube NanocompositesComposite Mechanical PropertiesComposite Shielding MaterialsElectrical PropertiesElectromagnetic InterferenceElectromagnetic Shielding MaterialsLightweight Shielding Materials
Lightweight, flexible, anisotropic porous MWCNT/WPU composites are fabricated via a facile freeze‑drying method, producing conductive cell walls, anisotropic pores, and interfacial polarization that drive ultrahigh EMI shielding. The composites achieve EMI shielding effectiveness exceeding 50 dB in the X‑band with densities as low as 20 mg cm⁻³, a specific SE up to 1148 dB cm³ g⁻¹ surpassing all previously reported materials, and improved mechanical properties.
Lightweight, flexible and anisotropic porous multiwalled carbon nanotube (MWCNT)/water‐borne polyurethane (WPU) composites are assembled by a facile freeze‐drying method. The composites contain extremely wide range of MWCNT mass ratios and show giant electromagnetic interference (EMI) shielding effectiveness (SE) which exceeds 50 or 20 dB in the X‐band while the density is merely 126 or 20 mg cm −3 , respectively. The relevant specific SE is up to 1148 dB cm 3 g −1 , greater than those of other shielding materials ever reported. The ultrahigh EMI shielding performance is attributed to the conductivity of the cell walls caused by MWCNT content, the anisotropic porous structures, and the polarization between MWCNT and WPU matrix. In addition to the enhanced electrical properties, the composites also indicate enhanced mechanical properties compared with porous WPU and CNT architectures.
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Freezing as a Path to Build Complex Composites
Sylvain Deville, Eduardo Saiz, R.K. Nalla et al. · Science · 2006 · 1.9K citations · Full text
Electromagnetic interference shielding effectiveness of carbon materials
D.D.L. Chung · Carbon · 2001 · 1.8K citations