Absorption-Dominant, Low-Reflection Multifunctional Electromagnetic Shielding Material Derived from Hydrolysate of Waste Leather Scraps

Abstract

High-performance flexible conductive films are highly promising for the development of wearable devices, artificial intelligence, medical care, etc. Herein, a three-step procedure was developed to produce electromagnetic interference (EMI) shielding, Joule heating, and a hydrophobic nanofiber film based on hydrolysate of waste leather scraps (HWLS): (i) electrospinning preparation of the HWLS/polyacrylonitrile (PAN)/ zeolitic imidazolate framework-67 (ZIF-67) nanofiber film, (ii) carbonization of the HWLS/PAN/ZIF-67 nanofiber film, and (iii) coating of the carbon nanofiber@cobalt (Co@CNF) nanofiber film with perfluorooctyltriethoxysilane (POTS). The X-ray diffraction results showed that metal nanoparticles and amorphous carbon had obvious peaks. The micromorphology results showed that metal nanoparticles were coated with carbon nanofibers. The conductivity and shielding efficiency of the carbon nanofiber film with 250 μm thickness could reach 45 S/m and 49 dB, respectively, and absorption values (A > 0.5) were higher than reflection (R) values for the Co@CNF nanofiber film, which indicated that the contribution of absorption loss was more significant than that of reflection loss. Ultrafast electrothermal response performances were also achieved, which could guarantee the normal functioning of films in cold conditions. The water contact angle of the Co@CNF@POTS nanofiber film was ∼151.3°, which displayed a self-cleaning property with water-proofing and antifouling. Absorption-dominant and low-reflection EMI shielding and electrothermal films not only showed broad application potential in flexible wearable electronic devices but also provided new avenues for the utilization of leather solid waste.

Magnetically driven hierarchically ordered carbonyl iron@SiO2/Ni@Ag/silicone rubber composite film for enhanced electromagnetic interference shielding with ultralow reflection

“…5h. 20–22,50–63 The CSNA film prepared in this work exhibited a higher SE and a lower R value than them, indicating outstanding EMI shielding and a significant reduction in EMW secondary pollution.…”

Design of Highly Conductive Leather Based on Zirconium Ion Coordination for Health Protection in Severe Harsh Conditions

“…[ 20 ] Therefore, developing composite methods with a more stable binding force has become one of the research directions of functionalized leather. [ 21 ]…”

“…[20] Therefore, developing composite methods with a more stable binding force has become one of the research directions of functionalized leather. [21] Carbon nanotubes (CNTs) are similar to 1D nanomaterials, exhibiting lightweight, hexagonal structure and excellent mechanical, electrical, and chemical properties, military manufacturing and other fields have a wide range of applications. [22,23] Recently, Li et al [24] achieved excellent EMI shielding (78.9 dB at 0.27 mm thickness) and Joule heating by compounding four composite conductive pastes of CNTs, MXene, polyaniline, and liquid metal with fabrics through a simple dip-coating technique.…”

Improvement of mechanical property for BNNSs/PAN composite films via electro-spinning with high filtration performance

“…Electrospinning is an advanced technique to fabricate nanofibers and an effective way in-situ charge injection. [13][14][15][16] The ability of charge retention depends on the dielectric properties and electric field strength of the polymer, especially the position where the charge is trapped in the material. 14 Gao and coworkers 6 confirmed the volume charges trapped in deep energy levels and dipole charges formation during electrospinning.…”

“…It has smaller dielectric loss and higher thermal stability that allow it to be widely used as carbon fiber precursors. 13,15 Boron nitride nanosheets (BNNSs) are 2D materials which can be exfoliated from hexagonal boron nitride (h-BN). [23][24] The functional nanosheets could increase the storage modulus of the composites which improved the mechanical performance.…”