Ultra-thin and highly flexible cellulose nanofiber/silver nanowire conductive paper for effective electromagnetic interference shielding

Chen, Yiming; Pang, Ling; Li, Yang; Luo, Hang; Duan, Gaigai; Mei, Changtong; Xu, Wenhui; Zhou, Wei; Liu, Kunming; Jiang, Shaohua

doi:10.1016/j.compositesa.2020.105960

Cited by 154 publications

(74 citation statements)

References 59 publications

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“…It can be seen that the expressions of ε 1 and ε 2 are consistent with the Debye Equations (5) and (6), where RC1, C1/C0 and C2/C0 represent τ, εs -ε∞ and ε∞, respectively, and plotting ε1 against ε2 can obtain a semicircle, which further demonstrates that the polarization relaxation composed of SG-SG micro-capacitors, AlN grain resistance and SG/AlN heterogeneous interfaces resulting from the SG addition contribute to the enhancement of the ε' and ε" values. Whereas, aside from the typical Cole-Cole semicircle, a smooth tail is also observed in the ε"−ε' curves for the samples with 6−8 wt% SG, which may be attributed to that the excessive conduction loss caused by the SG addition hides the effect of the relaxation process, the similar results can also be found in earlier reports [65][66][67].…”

Section: Dielectric Propertiessupporting

confidence: 63%

High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite as attenuating agent

Xia

Jiang

Pan

et al. 2020

Preprint

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High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite (SG) as the attenuating agent were fabricated through hot-pressing sintering. The SG maintains its three-dimensional morphology within the sintered bodies, which considerably impedes the sintering of the composites to some extent but slightly influences on the growth of AlN grains. The addition of SG reduces the strength of the composites, but provides a moderate toughening effect at the optimal addition amount (3.8 MPa·m1/2 at 4 wt% SG). Benefiting from the low anisotropy, high thermal conductivity, and the three-dimensional morphology of SG, the composites exhibit a relatively higher thermal conductivity (76.82 W·m-1·k-1 at 10 wt% SG) compared with composites added with non-spherical attenuating agent. The dielectric constant and loss (8.2–12.4 GHz) increase remarkably as the amount of SG added increases up to 8 wt%, revealing that the incorporation of SG improves the dielectric property of the composite. The composite with 7 wt% SG exhibits the best absorption performance with a minimum reflection loss of -14 dB at 12.4 GHz and an effective absorbing bandwidth of 0.87 GHz. The excellent overall properties of the SG/AlN microwave attenuating composites render them as a promising material for various applications. Moreover, SG has a great potential as an attenuating agent for microwave attenuating composites due to its strong attenuation upon integration, high thermal conductivity, and low anisotropy.

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Section: Dielectric Propertiessupporting

confidence: 63%

High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite as attenuating agent

Xia

Jiang

Pan

et al. 2020

Preprint

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“…Furthermore, Ag/ZnO and Ag@ZnO NPs exhibited some additional peaks at theta (2θ) = 38.28, 44.48, and 64.68, corresponding to (1 1 1), (2 0 0), and (2 2 0) facets of face‐centered cubic metallic Ag according to the JCPDS standard card (No. 04‐0783) and previous studies (Y. Chen, Pang, et al, 2020; Y. Chen, Zhang, et al, 2020). The morphology and microstructure of the as‐synthesized ZnO, Ag/ZnO, and Ag@ZnO NPs were studied by TEM.…”

Section: Resultsmentioning

confidence: 70%

Comparison of cytotoxicity of Ag/ZnO and Ag@ZnO nanocomplexes to human umbilical vein endothelial cells in vitro

Yan

Zhang

et al. 2020

J of Applied Toxicology

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Novel metal and metal oxide‐based nanocomplexes are being developed due to their superior properties compared with nanoparticles (NPs) based on single composition. In this study, we synthesized Ag‐coated ZnO (Ag/ZnO) and Ag‐doped ZnO (Ag@ZnO) NPs. The cytotoxicity and mechanisms associated with the synthesized NPs were investigated to understand the influence of Ag positions on biocompatibility of the NPs. After exposure to human umbilical vein endothelial cells (HUVECs), Ag/ZnO, Ag@ZnO, and ZnO NPs all significantly induced cytotoxicity, but the cytotoxic effects of Ag/ZnO and Ag@ZnO NPs were more modest in comparison with ZnO NPs. At cytotoxic concentrations, all NPs significantly induced intracellular Zn ions, which suggested a role of excessive Zn ions on cytotoxicity of NPs. All types of NPs significantly induced the expression of endoplasmic reticulum (ER) stress genes including DNA damage‐inducible transcript 3 (DDIT3), X‐box binding protein 1 (XBP‐1), and ER to nucleus signaling 1 (ERN1), but Ag/ZnO and Ag@ZnO NPs were less effective to induce DDIT3 and XBP‐1 expression compared with ZnO NPs. Not surprisingly, only ZnO NPs significantly induced the expression of caspase 3. Combined, the results from this study showed that Ag/ZnO and Ag@ZnO NPs were less cytotoxic and less potent to induce ER stress gene expression compared with ZnO NPs, but there were no significant differences between Ag/ZnO and Ag@ZnO NPs. Our results may provide novel understanding about the biocompatibility of Ag–ZnO nanocomplexes.

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“…[ 16,17 ] Various approaches have been explored to synthesize flexible/stretchable conductive films and fibers, including metallic wires, conducting polymer threads, [ 18 ] carbon‐based fibers, [ 19,20 ] carbon nanotube (CNT) fibers, [ 21,22 ] graphene fibers, [ 23,24 ] and nanocomposite fibers. [ 2,4,25 ] Silver nanowires and their composites, [ 26 ] electrospun carbon nanofibers, [ 27 ] and electrospun metal‐carbide nanofibers [ 28 ] have also been actively investigated for conductive films and fibers. However, the practical industrial employment of these fibers has been impeded by the tradeoff between electrical and mechanical properties.…”

Section: Figurementioning

confidence: 99%

Significantly Enhanced Mechanical Strength by the Hollow Structure of Conductive Stretchable Silver Nanoflower‐Polyurethane Fibers

et al. 2020

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The conductive stretchable nanocomposite fibers, synthesized by the wet spinning technology, are typically composed of conductive nanofillers and polymer matrix to achieve both high electrical conductivity and stretchability. However, the inclusion of nanofillers blocks the solvent extraction passages, resulting in large voids (>3 μm2) and decreasing mechanical strength. Herein, hollow fibers synthesized using a coaxial spinneret with double concentric needles are presented. The dope mixture of silver nanoflower‐shaped particles (AgNFPs, 36 vol%), polyurethane (PU), and dimethylformamide is extruded through the outer nozzle, whereas the coagulant is supplied to the inner nozzle. This significantly shortens the maximum solvent diffusion length from 127.5 μm of solid fibers to 18.5 μm of hollow fibers. Resultantly, the large void becomes negligible in the hollow AgNFP‐PU fiber, and the mechanical strength increases by 100% (29 MPa) compared with that of the solid AgNFP‐PU fiber (14.5 MPa). The initial electrical conductivity (≈10 990 S cm−1) and rupture strain (≈120%) of both hollow and solid fibers are similar. Furthermore, the change in resistance decreases by 50% at 50% strain when the inner space is filled with liquid metal. This demonstrates that versatile functionality can be implemented by filling the gap with functional materials.

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Ultra-thin and highly flexible cellulose nanofiber/silver nanowire conductive paper for effective electromagnetic interference shielding

Cited by 154 publications

References 59 publications

High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite as attenuating agent

High-thermally conductive AlN-based microwave attenuating composite ceramics with spherical graphite as attenuating agent

Comparison of cytotoxicity of Ag/ZnO and Ag@ZnO nanocomplexes to human umbilical vein endothelial cells in vitro

Significantly Enhanced Mechanical Strength by the Hollow Structure of Conductive Stretchable Silver Nanoflower‐Polyurethane Fibers

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