Enhanced Low-Frequency Electromagnetic Properties of MOF-Derived Cobalt through Interface Design

Liu, Wei; Tan, Shujuan; Yang, Zhihong; Ji, Guangbin

doi:10.1021/acsami.8b10685

Cited by 148 publications

(60 citation statements)

References 70 publications

(124 reference statements)

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“…Compared with CF/PANI, the larger PANI particles in NaCF/PANI can provide more efficient electron propagation paths, which results in stronger conduction loss. Polarization loss can be categorized into interfacial and dipole polarization . As mentioned above, the different electrical conductivity between PANI coating layer and NaCF induce interfacial polarization.…”

Section: Resultsmentioning

confidence: 99%

An Ingenious Strategy to Construct Helical Structure with Excellent Electromagnetic Shielding Performance

Zhang

Yang

Wen

2019

Adv Materials Inter

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necessary features has captured enormous scientific attentions.In particular, intrinsically conductive polymers (ICPs) have gained a special status among the promising EMI shielding materials. Among the large family of ICPs, polyaniline (PANI) is one of the prominent polymers, primarily owing to its fascinating properties, such as high electrical conductivity, ease of fabrication, unique controlled chemical and physical properties, as well as low cost. [3] Recently, PANI-based composite has aroused great interest due to the magnified or enhanced electromagnetic properties compared to their bulk counterpart. [4] Various components, such as carbon material, barium titanate (BaTiO 3 ), and bagasse fiber have been adopted to prepare the composites. For example, multi-walled carbon nanotube (MWCNT)/PANI nanocomposites possess a total EMI shielding effectiveness (SE) of ≈39.2 dB at the thickness of 2.0 mm, which is attributed to the synergistic effect of two complementary MWCNT and PANI phases. [5] Due to the optimized dielectric and electrical properties, an excellent SE of 71.5 dB was achieved for BaTiO 3 /PANI nanocomposites with the thickness of 2.7 mm. [6] Compared to pristine PANI, the core-shelled bagasse fiber@PANI composite exhibits immense potential for EMI shield with higher attenuation performance due to the synergistic and interfacial effects. [4b] It is noteworthy that in above cases the structure of PANI is a key parameter that determines its properties and application. Therefore, the delicate regulation and control of highly ordered PANI structures are highly desirable.On the other hand, inspired by natural materials, the designed helical structures endow materials the unique electrical and magnetic performance. Motojima et al. reported the microwave can be significantly attenuated by the helical structure, because of the effective generation of an inductive current. [7] Most recently, Yang et al. reported that PANI with a helical superstructure was produced by co-self-assembly process combined with emulsion droplets methods. The enhanced microwave absorption ability was achieved due to the supramolecular chirality. [8] So, the helical structure is expected to produce excellent EMI shielding performances. But as of yet, sparse research has concentrated on the effect of spiral structure on the shielding properties of PANI-based composites and their underlying mechanism. Furthermore, the EMI shielding capability of the PANI-based helical composite lacks sufficient theoretical Herein, a unique, 3D helical composite with excellent electromagnetic interference (EMI) shielding capability is fabricated. The alkali treated natural cotton fiber (NaCF) is adopted as the helical templet. The compacted polyaniline (PANI) clusters are grafted over NaCF surface via in situ polymerization technology. The correlation between structure and electromagnetic characteristics is investigated in details. The high doping degree and high crystalline phase of PANI coating layer results in the enhanced electrical conductivit...

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Section: Resultsmentioning

confidence: 99%

An Ingenious Strategy to Construct Helical Structure with Excellent Electromagnetic Shielding Performance

Zhang

Yang

Wen

2019

Adv Materials Inter

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“…In this study, the permittivity measurement was conducted using the open-ended coaxial probe 16,19,21,26,27 covering frequency range 5-50 GHz. The Scattering parameters S 11 was measured with a probe connected to Anritsu Vector Network Analyzer (VNA).…”

Section: Methodsmentioning

confidence: 99%

Microwave Absorbing properties of metal functionalized-CNT-polymer composite for stealth applications

Hussein

Jehangir

Rajmohan

et al. 2020

Sci Rep

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In this study, we report on the electrical properties of multi-wall carbon nanotubes (MWCNT) composites functionalized with metal or metal alloy oxides and embedded in a polyurethane matrix to develop a lightweight material for microwave absorption and shielding. The CNT nanoparticles are functionalized with metallic oxides such as Cobalt oxide, Iron oxide, and Cobalt Iron oxide, at three different concentrations. Metallic oxides are used at 5%, 10%, and 20% concentration of the total CNT percentage weight. The resulting functionalized CNT is mixed with polyurethane polymer at 5% wt of the total composite weight. Three sets of cylindrical samples are developed, and each set contains three different metal oxide concentrations. The dielectric properties of the nine developed samples are obtained by measuring their permittivity spectra using an open-ended coaxial probe technique in the spectral range 5–50 GHz. The absorption efficiency of the composites is then obtained by calculating the reflection loss at normal incidence. The results show that the spectral range of absorption can be tuned by changing the CNT concentration, and the material thickness. Functionalized CNT with different alloyed metal oxides enhanced the absorption efficiency of the polyurethane/CNT composites. Such functionalized composites can be used to replace the common heavyweight materials used for microwave applications.

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“…Finally, a minimum RL of À20 dB could be achieved at a low frequency (2-8 GHz). 117 However, when the compounding conditions are relatively harsh (such as strong acid, strong alkali, and high-temperature environments), the microstructure and the components of the MOF may be destroyed.…”

Section: Materials Advances Reviewmentioning

confidence: 99%

Porous carbon materials for microwave absorption

et al. 2020

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Enhanced Low-Frequency Electromagnetic Properties of MOF-Derived Cobalt through Interface Design

Cited by 148 publications

References 70 publications

An Ingenious Strategy to Construct Helical Structure with Excellent Electromagnetic Shielding Performance

An Ingenious Strategy to Construct Helical Structure with Excellent Electromagnetic Shielding Performance

Microwave Absorbing properties of metal functionalized-CNT-polymer composite for stealth applications

Porous carbon materials for microwave absorption

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