Flexible multilayered films consisting of alternating nanofibrillated cellulose/Fe3O4 and carbon nanotube/polyethylene oxide layers for electromagnetic interference shielding

Li, Yi; Xue, Bai; Yang, Shengdu; Cheng, Zhentao; Xie, Lan; Zheng, Qiang

doi:10.1016/j.cej.2020.128356

Cited by 117 publications

(68 citation statements)

References 67 publications

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“…Generally, the electrical conductivity of materials is of great relevance to the EMI shielding performance [ 16 , 42 , 55 ]. It can be proved that the electrical conductivity of Ni@MF foams is enormously elevated from 28.6 to 460.8 S m −1 , with the plating time extending from 1 to 5 min (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…4 e, f. No matter which side of Ni@MF/CNT-75/PBAT composites EM wave is incident from, R is always higher than A, indicating the dominant role of EM reflection in the EMI shielding process. This phenomenon is mainly ascribed to the fact that a large part of EM wave is reflected by the material surface before penetrating it [ 42 ]. When the EM wave is incident from Ni@MF layer, some incident EM wave passes into Ni@MF layer with relatively weak reflectivity due to the low electrical conductivity of Ni@MF layer (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…However, the issues of high thickness, poor mechanical properties, and weak flexibility are still existing. Inspired by the structure of nacre, the "brick-and-mortar" structure with superimposed layer toughening effects could impart the composites with excellent toughness and strength [41][42][43][44][45]. For instance, Shahzad et al [43] prepared nacre-like MXene/sodium alginate (SA) via vacuum-assisted filtration beginning from colloidal solutions.…”

Section: Introductionmentioning

confidence: 99%

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Directional Electromagnetic Interference Shielding Based on Step-Wise Asymmetric Conductive Networks

Xue

Cheng

et al. 2021

Nano-Micro Lett.

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Some precision electronics such as signal transmitters need to not only emit effective signal but also be protected from the external electromagnetic (EM) waves. Thus, directional electromagnetic interference (EMI) shielding materials (i.e., when the EM wave is incident from different sides of the sample, the EMI shielding effectiveness (SE) is rather different) are strongly required; unfortunately, no comprehensive literature report is available on this research field. Herein, Ni-coated melamine foams (Ni@MF) were obtained by a facile electroless plating process, and multiwalled carbon nanotube (CNT) papers were prepared via a simple vacuum-assisted self-assembly approach. Then, step-wise asymmetric poly(butylene adipate-co-terephthalate) (PBAT) composites consisting of loose Ni@MF layer and compact CNT layer were successfully fabricated via a facile solution encapsulation approach. The step-wise asymmetric structures and electrical conductivity endow the Ni@MF/CNT/PBAT composites with unprecedented directional EMI shielding performances. When the EM wave is incident from Ni@MF layer or CNT layer, Ni@MF-5/CNT-75/PBAT exhibits the total EMI SE (SET) of 38.3 and 29.5 dB, respectively, which illustrates the ΔSET of 8.8 dB. This work opens a new research window for directional EMI shielding composites with step-wise asymmetric structures, which has promising applications in portable electronics and next-generation communication technologies.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Directional Electromagnetic Interference Shielding Based on Step-Wise Asymmetric Conductive Networks

Xue

Cheng

et al. 2021

Nano-Micro Lett.

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“…As the most abundant natural polymer on earth, cellulose and its derivatives have become promising materials for the fabrication of sensors due to their biodegradability, optical stability, nontoxicity, good biocompatibility and easily modified abilities. [26][27][28][29][30] Among them, carboxymethyl cellulose (CMC) is commonly widely used in the medicine, papermaking and food additive industries, and the special structure of CMC allows it to be easily dissolved in water owing to the presence of COO─ groups. In addition, CMC also contains several other important groups and can be covalently bonded or electrostatically attracted to appropriate molecules.…”

Section: Introductionmentioning

confidence: 99%

A Facile Strategy for the Preparation of Carboxymethylcellulose‐Derived Polymer Dots and Their Application to Detect Tetracyclines

Zhang

Wang

Yang

2021

Macro Chemistry & Physics

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Developing nonconjugated fluorescent polymer dots based on cellulose materials through a simple and economical method is of high value for sensing or imaging. However, great challenges are still being suffered. Herein, strong blue‐green emission water‐soluble cellulose polymer dots (CPDs) are synthesized with excellent stability using carboxymethyl cellulose (CMC) and citric acid (CA) as precursors via a mild reaction and facile synthesis process. Near‐spherical nanoparticles with an average size of approximately 11.3 nm and quantum yield of 11.5% are obtained. Importantly, CPDs can be utilized as an excellent fluorescent probe for the detection of tetracyclines (TCs) in aqueous solutions through fluorescence quenching via the inner filter effect. The detection limit for fluorescent CPDs for TC detection is found to be as low as 4.1 × 10‐9 m, and two good linear relationships for TC concentration ranging from 51.8 × 10‐9 to 256.8 × 10‐9 m (R2 = 0.996) and 0 × 10‐6 to 15.3 × 10‐6 m (R2 = 0.997) are obtained. Finally, the fluorescent CPD fluorescent probe is successfully utilized to detect TC in real samples, including tap water, milk, and river water.

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“…Nanotubes have aroused intense interests among the fields of catalysis, [1][2][3][4] biomedicine, [5][6][7] electronics, [8,9] and ecology, [10] owing to the intrinsic merits of the large surface areas with abundant active sites for adsorptions and catalytic reactions, the easy modifiable inner and external surface, the short distance of the thin-wall for fast mass-transfer and photocarriers transport, and the high efficient utilization of light irradiation Dedicated to the 100th Anniversary of Chemistry at Nankai University proposed strategy is simple, applicable for synthesis of the doped NH 4 Ga(OH) 2 CO 3 nanotubes, and massive production of Ga 2 O 3 and doped Ga 2 O 3 nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Porous Ga₂O₃ Nanotubes Derived from Urease‐Mediated Interfacially‐Grown NH₄Ga(OH)₂CO₃ for High‐Efficient Hydrogen Evolution

Wang

Zhang

et al. 2021

Small

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by the hollow cavity. [11] Accordingly, many strategies for fabrication of nanotubes, such as arc discharge, [12] chemical vapor deposition (CVD), [13][14][15] ball-milling and annealing, [16] laser ablation, [17] molecular beam epitaxy, [18] sol-gel, [19,20] atomic layer deposition, [21][22][23] hydro/solvothermal, [24,25] electrochemical anode, [26,27] and electrospinning, [28][29][30] have been developed. However, in those strategies, the hightemperature and/or templates are usually acquired to get the hollow structure of nanotubes, and thus high energy-and time-consumption but low productivity are inevitable. Consequently, the green methodologies for massive fabrication of nanotubes are imperative to boost their widespread application.Gallium oxide (Ga 2 O 3 ), [31,32] a nearly direct band gap semiconductor, has found wide applications in optoelectronic devices, [33,34] gas-sensors, [35,36] energy storage, [37,38] photocatalysis, [39,40] photoelectrocatalysis, [41] and solar cells. [42] Numerous morphology of Ga 2 O 3 , including bulk, nanoparticles, nanosheets, nanowires, nanorods, and nanobelts, has been made mainly through GaOOH intermediates. [43] Though nanotubes have many advantages as indicated above, only two researches on Ga 2 O 3 nanotubes were reported, one was fabricated by the Au(Si)-templated CVD for high-temperature nanothermometers, [44] the other was prepared by anodization of Ga metal at −10 °C for generation of hydrogen from water. [45] Herein, we report a novel strategy for massive fabrication of porous Ga 2 O 3 nanotubes, processing from the intermediate of NH 4 Ga(OH) 2 CO 3 nanotubes that are interfacially-grown from the urease-mediated decomposition of urea in aqueous solution of gallium salts at 20-50 °C. The enzymolysis of urea by urease rapidly produces plenty of OH − , NH 3 /NH 4 + , and CO 2 /CO 3 2− , and in the presence of Ga 3+ , the NH 4 Ga(OH) 2 CO 3 nanotubes are interfacially grown. The pH change from urea enzymolysis (i.e. OH − ) has been utilized for regulating the uniform size of TiO 2 nanoparticles [46] and the morphology of Fe 3 O 4 nanomaterials. [47] However, in our case, all the species of OH − , NH 4 + , and CO 3 2− from urea enzymolysis participate in the formation of NH 4 Ga(OH) 2 CO 3 nanotubes. The formation mechanism of NH 4 Ga(OH) 2 CO 3 nanotubes is proposed, and the advantage of Ga 2 O 3 nanotubes over nanoparticles is demonstrated by the enhanced catalytic H 2 evolution from water-splitting. The The authors proposed a novel template-free strategy, urease-mediated interfacial growth of NH 4 Ga(OH) 2 CO 3 nanotubes at 20-50 °C, to fabricate the porous Ga 2 O 3 nanotubes. The subtlety of the proposed strategy is all the products from urea enzymolysis are utilized in formation of NH 4 Ga(OH) 2 CO 3 precipitates, and the key for interfacial growth of NH 4 Ga(OH) 2 CO 3 nanotubes is the dynamic match between the rate of CO 2 bubble fusion and NH 4 Ga(OH) 2 CO 3 precipitation. The proposed strategy works well for the doped porous Ga 2 O 3 nanotubes. As a proof-of...

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Flexible multilayered films consisting of alternating nanofibrillated cellulose/Fe3O4 and carbon nanotube/polyethylene oxide layers for electromagnetic interference shielding

Cited by 117 publications

References 67 publications

Directional Electromagnetic Interference Shielding Based on Step-Wise Asymmetric Conductive Networks

Directional Electromagnetic Interference Shielding Based on Step-Wise Asymmetric Conductive Networks

A Facile Strategy for the Preparation of Carboxymethylcellulose‐Derived Polymer Dots and Their Application to Detect Tetracyclines

Porous Ga₂O₃ Nanotubes Derived from Urease‐Mediated Interfacially‐Grown NH₄Ga(OH)₂CO₃ for High‐Efficient Hydrogen Evolution

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Flexible multilayered films consisting of alternating nanofibrillated cellulose/Fe3O4 and carbon nanotube/polyethylene oxide layers for electromagnetic interference shielding

Cited by 117 publications

References 67 publications

Directional Electromagnetic Interference Shielding Based on Step-Wise Asymmetric Conductive Networks

Directional Electromagnetic Interference Shielding Based on Step-Wise Asymmetric Conductive Networks

A Facile Strategy for the Preparation of Carboxymethylcellulose‐Derived Polymer Dots and Their Application to Detect Tetracyclines

Porous Ga2O3 Nanotubes Derived from Urease‐Mediated Interfacially‐Grown NH4Ga(OH)2CO3 for High‐Efficient Hydrogen Evolution

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Porous Ga₂O₃ Nanotubes Derived from Urease‐Mediated Interfacially‐Grown NH₄Ga(OH)₂CO₃ for High‐Efficient Hydrogen Evolution