Microwave absorption and infrared emissivity of helical polyacetylene@multiwalled carbon nanotubes composites

Pan, Wenlu; He, Min; Bu, Xiaohai; Zhou, Yuming; Ding, Binbin; Huang, Tingyuan; Huang, Shuang; Li, Shiwei

doi:10.1007/s10854-017-6584-4

Cited by 25 publications

(8 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, acetylene is selectively adsorbed on the Cu crystal plane, which induces the reconstruction of the surface atoms of the nanocopper. As the ratio of (100) and (111) planes decreases, the nanocopper changes from a spherical shape to a regular polyhedral nanocrystal. The coordination polymerization rate also shows differences on the different crystal planes of Cu, resulting in the spiral structure of nanofibers.…”

Section: Coordination Polymerization Mechanismmentioning

confidence: 99%

A review of helical carbon materials structure, synthesis and applications

Wang

Jiao

et al. 2020

Rare Met.

View full text Add to dashboard Cite

The helical structures possess unique physical and chemical properties, such as superelasticity, high specific strength, chirality, and electromagnetic cross-polarization characteristics. With the development of nanoscience and nanotechnology, helical structures with various scales have been discovered or synthesized artificially. Among them, the helical carbon materials receive much attention around the world. Herein, we present a brief review of the development of helical carbon materials in terms of structures, synthesis techniques and mechanisms, and applications. The controllable designing of catalysts, carbon sources and reaction parameters plays a key role to optimize the properties of the helical carbon materials. At the same time, the applications in microwave absorption devices, sensors, catalysts, energy conversions and storage devices, and solar cell are also presented. For the good chemical and physical properties, helical carbon materials have a good application prospect in many fields. The potential issues and future opportunities of the helical carbon materials are also proposed.

show abstract

Section: Coordination Polymerization Mechanismmentioning

confidence: 99%

A review of helical carbon materials structure, synthesis and applications

Wang

Jiao

et al. 2020

Rare Met.

View full text Add to dashboard Cite

show abstract

“…With the speedy progress of electromagnetic (EM) technology in radar, wireless communication, local area network, and other communication systems, the electromagnetic (EM) radiation and electromagnetic interference (EMI) have become a serious problem for humankind and are disturbing the electronic devices especially in the X band region (8.2–12.4 GHz). − The X-band frequency region of the EM spectrum is widely used in wireless communication, satellites, terrestrial communication, motion detectors, traffic light crossing detection, weather radar, and medical sciences . Therefore, it is extremely important to develop effective shielding techniques to curb or eradicate the resultant problem produced by EMI.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Carbon Nanotube-Coated Carbon Fiber: Ultra Lightweight, Thin, and Highly Efficient Microwave Absorber

Singh

Akhtar

Kar

2018

ACS Appl. Mater. Interfaces

239

115

View full text Add to dashboard Cite

Strong EM wave absorption and lightweight are the foremost important factors that drive the real-world applications of the modern microwave absorbers. This work mainly deals with the design of highly efficient microwave absorbers, where a hierarchical carbon nanotube (CNT) forest is first grown on the carbon fiber (CF) through the catalytic chemical vapor deposition method. The hierarchical carbon nanotube grown on the carbon fiber (CNTCF) is then embedded in the epoxy matrix to synthesize lightweight nanocomposites for their use as efficient microwave absorbers. The morphological study shows that carbon nanotubes (CNTs) self-assemble to form a trapping center on the carbon fiber. The electromagnetic characteristics of resultant nanocomposites are investigated exclusively in the X-band (8.2-12.4 GHz) using the network analyzer. The synthesized nanocomposites, containing 0.35 and 0.50 wt % CNTCFs, exhibit excellent microwave absorption properties, which could be attributed to the better impedance matching conditions and high dielectric losses. The reflection loss (RL) of -42.0 dB (99.99% absorption) with -10 dB (90% absorption) and -20 dB (99% absorption) bandwidths of 2.7 and 1.16 GHz, respectively, is achieved for 0.35 wt % CNTCF loading at 2.5 mm thickness. The composite with 0.50 wt % CNTCF loading illustrates substantial absorption efficiency with the RL reaching -24.5 dB (99.65% absorption) at 9.8 GHz and -10 dB bandwidth comprising 84.5% of the entire X band. The excellent microwave properties obtained here are primarily due to the electric dipole polarization, interfacial polarization, and unique trapping center. These trapping centers basically induce multiple reflections and scatterings, which attenuate more microwave energy. This investigation opens a new approach for the development of extremely lightweight, small-thickness, and highly efficient microwave absorbers for X-band applications.

show abstract

“…PANI 3D superstructures display the lowest RL of −51.60 dB and a 5.12 GHz bandwidth (90% damping) with 2.0 mm in thickness and 20 wt% in loading rate [11]. PA@MWNTs show a bandwidth of 3.2 GHz (90% absorption) and a minimum RL of −20.65 dB at 9.7 GHz [18]. It can be seen from the previous research that researchers have made a breakthrough in the enhancement of EMW absorption properties (EMWAPs) for CCP and CCP-based composites.…”

Section: Introductionmentioning

confidence: 99%

HCl guided morphology and conductivity of chiral PPy nanostructures toward efficient electromagnetic wave absorption

Yang

Fan

Wang

et al. 2021

Sci. China Technol. Sci.

View full text Add to dashboard Cite

To solve the severe electromagnetic (EM) radiation from the widespread application of electronic equipment, we developed a simple template-guided oxypolymerization strategy to synthesize polypyrrole (PPy) planar helixes as an efficient EM wave (EMW) absorber, and systematically investigated the morphology-dependent chirality, conductivity, and microwave absorption properties. As HCl concentration [HCl] varied from 0 to 2.0 M, the morphology evolved from planar helix to 3D cross-linking network structures, the conductivity increased from 0.0019 to 0.0302 S/cm, and the EM parameters peaked at [HCl]=0.5 M. Compared to other absorbers, the PPy planar helix formed at [HCl]=0 M possessed wider absorption band (5.84 GHz), smaller matching thickness (1.6 mm), lower loading (25 wt.%), and intenser absorption (−48.17 dB). The reason lies in the strong attenuation capability, multiple resonances, multiple scattering, and good impedance matching generated by chiral PPy planar helixes with a distinctive helical configuration, doped heteroatoms (O,S), and a local conductive network. Our results suggest that PPy planar helixes offer great promise for fields such as chiral sensors, electronics, optics, chiral catalysis, and EMW absorption and shielding due to their distinctive morphology, tunable conductivity, and outstanding EMW absorption properties (EMWAPs).

show abstract

Microwave absorption and infrared emissivity of helical polyacetylene@multiwalled carbon nanotubes composites

Cited by 25 publications

References 57 publications

A review of helical carbon materials structure, synthesis and applications

A review of helical carbon materials structure, synthesis and applications

Hierarchical Carbon Nanotube-Coated Carbon Fiber: Ultra Lightweight, Thin, and Highly Efficient Microwave Absorber

HCl guided morphology and conductivity of chiral PPy nanostructures toward efficient electromagnetic wave absorption

Contact Info

Product

Resources

About