Highly Flexible Fabrics/Epoxy Composites with Hybrid Carbon Nanofillers for Absorption-Dominated Electromagnetic Interference Shielding

Abstract

Highlights Highly flexible carbon ink-loaded polyester fabric/epoxy composites with outstanding mechanical durability and absorption-dominant EMI-shielding characteristics are fabricated. The fracture toughness is ~ 38.5 MPa m 1/2 and electrical conductivity is maintained after 1000 bending cycles. A superior electromagnetic interference SE /t of ~ 66.8 dB mm –1 was observed in the X-band frequency with over 0.7 absorption coefficient, related to the hierarchical structures composed of macro-scaled voids from the polyester nonwoven fabric skeleton and nano-scaled networks from SWCNTs/rGO.

Development of Electromagnetic-Wave-Shielding Polyvinylidene Fluoride–Ti3C2Tx MXene–Carbon Nanotube Composites by Improving Impedance Matching and Conductivity

“…The Schelkunoff theory [ 49 ] represents the attenuation mechanism of shields to electromagnetic waves. The electromagnetic interference total shielding efficiency (EMI SE T ) is the sum of absorption (SE A ), reflection (SE R ), and multiple reflections (SE M ) [ 50 , 51 ]: where t is the thickness of the shielding material, f is the electromagnetic wave frequency, and σ r and μ r are the electrical conductivity relative to pure copper and relative magnetic permeability, respectively. The equation is valid for material with thicknesses above the skin depth [ 52 ].…”

Ultraviolet-Induced Gas Sensing Performance of Ag/WO3/rGO Nanocomposites for H2S Gas Sensors

“…The D-band is a result of the disorder of carbon materials caused by the presence of sp 3 -hybridized C atoms in the grain boundary and defects. On the other hand, the G-band is attributed to the E 2g vibration of sp 2 carbon atoms. , These bands of WO 3 and rGO are also found in the WO 3 /rGO nanocomposite but slightly shifted toward lower wavenumbers, confirming the successful preparation of the WO 3 /rGO nanocomposite.…”

“…On the other hand, the G-band is attributed to the E 2g vibration of sp 2 carbon atoms. 33,34 These bands of WO 3 and rGO are also found in the WO 3 /rGO nanocomposite but slightly shifted toward lower wavenumbers, confirming the successful preparation of the WO 3 /rGO nanocomposite.…”

Absorption-Dominant mmWave EMI Shielding Films with Ultralow Reflection using Ferromagnetic Resonance Frequency Tunable M-Type Ferrites

“…This is a more serious issue with a short wavelength of 5G mmWave frequency bands and tight component-to-component spacing in integrated 5G mobile modules [20]. Therefore, there is a high demand for absorption-dominant 5G EMI shielding materials with low reflection and high absorption of EMI [21][22][23]. The SER of absorption-dominant shielding materials should not be higher than 3 dB as it will reflect more than 50% of EMI [24].…”