With
the popularization of 5G communications and the internet of
things, electromagnetic wave (EW) radiation pollution has aroused
much concern from the public, and the search for new materials and
technologies for preparing electromagnetic shielding materials still
continues all around the world. However, the contradiction among high
shielding performance, economic applicability, and flexibility is
still not well balanced. Herein, we fabricated a novel foldable leather
solid waste (LSW)/polyvinyl alcohol (PVA)/silver (Ag) paper with excellent
electromagnetic interference (EMI)-shielding ability using a facile
but sustainable electroless plating (ELP) method with LSW as the resource.
Taking PVA as a cross-linker, debundled leather fibers (LFs) generated
by solid-state shearing milling could generate a flexible LSW/PVA
substrate with a high specific surface area, and eventually the deposited
Ag layer served as a protective layer not only to significantly improve
the mechanical and thermal robustness, but also to endow the LSW/PVA/Ag
paper with good hydrophobicity, which could protect from potential
moisture damage. In addition to the reflection effect of metallic
Ag on EW, the hierarchical structure of collagen fibers played an
important role in superior high EMI-shielding effectiveness (∼55–∼90
dB) by an absorption-dominant EMI-shielding mechanism. Furthermore,
a multilayer LSW/PVA/Ag paper was also prepared with enhanced EMI-shielding
effectiveness of 111.3 dB benefited by constructing multiple reflection–absorption
interfaces. The high-performance, environmentally friendly, and low-cost
EMI-shielding materials not only offered a new avenue toward recycling
LSW in a more value-added way, but also displayed promising potential
for application in flexible shielding materials or wearable clothing.
Triboelectric polymer with high charge density is the foundation to promote the wide range of applications of triboelectric nanogenerators. This work develops a method to produce triboelectric polymer based on repeated rheological forging. The fluorinated ethylene propylene film fabricated by repeated forging method not only has excellent mechanical properties and good transmittance, but also can maintain an ultrahigh tribo-charge density. Based on the film with a thickness of 30 μm, the output charge density from contact-separation nanogenerator reaches 352 μC·m−2. Then, the same film is applied for the nanogenerator with air-breakdown mode and a charge density of 510 μC·m−2 is further achieved. The repeated forging method can effectively regulate the composition of surface functional groups, the crystallinity, and the dielectric constants of the fluorinated ethylene propylene, leading to the superior capability of triboelectrification. Finally, we summarize the key parameters for elevating the electrification performance on the basis of molecular structure and related fabrication crafts, which can guide the further development of triboelectric polymers.
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