Preparation and microwave absorption performance of a flexible Fe<sub>3</sub>O<sub>4</sub>/nanocarbon hybrid buckypaper and its application in composite materials

Wang, Jia; Sun, Guangmei; Yuan, Kai; Guan, Ziyi; Wei, Xinyi

doi:10.1039/c9ra07406f

Cited by 13 publications

(6 citation statements)

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“…The greater degree of mobile carrier charge accumulation from the interfacial polarization of the denser surface/interface structure of the NF substrate, imparted by the higher applied temperature of thermal-rolling, provided a greater increase in the electrical conductivity and EMI SE. 64,65 In summary, when the MWCNT suspension is filtered through the NF substrates, MWCNTs penetrated the pores and deposited on the NF surface from the top view of the interface between BP and NF as seen in Figure 5. More interfaces forming between the densely packed NF and MWCNTs provided more chances to enhance interfacial polarization.…”

Section: = + Se (Db) Se Sementioning

confidence: 98%

“…The interface between the two different heterogeneous materials in the BP/NF composite membrane could accumulate charges and dielectric losses, which could enhance the EMI SE. 64,65 In other words, the BP/NF composite membrane can undergo a synergy phenomenon called "interfacial polarization" between the CNT and PAN NF substrate; therefore, the EMI SE could be enhanced using the NF substrate. This is in agreement with previous findings on PAN/BP.…”

Section: = + Se (Db) Se Sementioning

confidence: 99%

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Multiwalled Carbon Nanotube Buckypaper/Polyacrylonitrile Nanofiber Composite Membranes for Electromagnetic Interference Shielding

Kim

Seong³

et al. 2021

ACS Appl. Nano Mater.

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Polymer composites have been explored for electromagnetic interference (EMI) shielding materials instead of metals due to their low density and flexibility. However, the insufficient EMI shielding effectiveness (EMI SE) caused by the loss of the conducting pathways within the filler-to-filler contacts inside the polymer matrix limits the use of polymers. Herein, we demonstrate a facile and scalable approach for preparing ultrathin and lightweight multiwalled carbon nanotube (MWCNT) buckypaper/electrospun polyacrylonitrile (PAN) nanofiber (BP/NF) composite membranes via electrospinning, thermal-rolling, and vacuum filtration. The smooth surface, higher surface energy, and high mechanical strength of 19 MPa were dependent on the enhanced interfacial network between the BP and NF substrates, thermal-rolled at 130 °C. Furthermore, a superior specific shielding efficiency of 13 734 dB cm2 g–1 was achieved for the 100 μm thick BP/NF composite membrane, which is superior to most of the previously reported MWCNT/polymer composite membranes. This study demonstrates a critical breakthrough for the application of the polymer composites for applications in portable, wearable electronics and military equipment.

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Section: = + Se (Db) Se Sementioning

confidence: 98%

Section: = + Se (Db) Se Sementioning

confidence: 99%

Multiwalled Carbon Nanotube Buckypaper/Polyacrylonitrile Nanofiber Composite Membranes for Electromagnetic Interference Shielding

Kim

Seong³

et al. 2021

ACS Appl. Nano Mater.

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“…Thus, conducting materials often show lower absorption and higher reflection losses since most of the energy is firstly reflected due to the impedance mismatch. 43 Hence, BP layers act as conductive plates reflecting most of the incident energy of the composites.…”

Section: Power Balancementioning

confidence: 99%

The influence of the transparent layer thickness on the absorption capacity of epoxy/carbon nanotube buckypaper at X‐band

Reis

Rezende

Ribeiro

2021

J of Applied Polymer Sci

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Carbon nanotube films (BPs) as EMI shielding materials can be applied in electronic and communication devices due to their high electrical conductivity.Sandwich structures can offer excellent shielding effectiveness by introducing a wave-transmitting layer between conductive films. However, the optimization of the structure demands a deep investigation and plays a crucial role in the final shielding properties of the composites. In this work, BPs are incorporated into epoxy substrates with variable thicknesses (1-6 mm) to fabricate epoxy/BP sandwich structures. The morphology of the CNT films is analyzed by SEM, and the electrical conductivity of all prepared samples is measured by 4-point method. The electromagnetic tests are carried out in the X-band (8.2-12.4 GHz) through the scattering parameters. SEM images reveal a porous structure without visible agglomeration. The electrical conductivity of the BP reaches up to 996 S/m, whereas the values for epoxy/BP composites varies in the range of 8.51-3.13 S/m (1 to 3 mm). BP total shielding efficiency (SE T ) is approximately 14 dB along the X-band spectrum, with similar contributions of reflection and absorption losses. While, the composites show mainly absorbing behavior, especially in the thicker samples, with more significant SE T values (23.4 dB-6 mm).

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“…However, due to their disadvantages such as high weight, poor corrosion resistance, poor mechanical flexibility, and narrow absorption band; carbon materials often require higher additions to achieve better wave absorption, but there is a problem of difficulty in uniform dispersion; conductive polymers have poor wave absorption ability when used alone and cannot meet the demand for electromagnetic absorbing materials in many fields. [6][7][8] Therefore, it is crucial to develop an electromagnetic wave absorbing material with lightweight, high strength, and good corrosion resistance. The composite material prepared by combining conductive fillers with polymers is an excellent choice for manufacturing high-performance electromagnetic wave absorbing materials because of its electrical conductivity, flexibility, and lightness of polymers.…”

Section: Introductionmentioning

confidence: 99%

Microwave absorbing properties of polyaniline coated Buckypaper reinforced epoxy resin composites

Xia

Wang

et al. 2022

J of Applied Polymer Sci

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With the development of science and technology and electronic industry, electromagnetic wave pollution has become the fifth largest pollution in the world today, so it is very important to develop a material with good wave absorbing properties. In this study, polyaniline was loaded onto the surface of carbon nanotubes (CNTs) bundles in Buckypaper by electropolymerization, and epoxy resin was used as the matrix to prepare a polyaniline (PANI)/Buckypaper/EP composite absorber with integrated structure and function. The research shows that the CNTs are prepared into Buckypaper with a three‐dimensional porous structure by vacuum filtration. This three‐dimensional porous structure ensures that CNTs can be added at a high content and uniformly dispersed in epoxy resin. PANI adjusts the impedance matching of Buckypaper and adds more loss mechanisms. Under the optimal matching thickness of 1.5 mm, the optimal reflection loss reaches −29.31 dB, and the absorption bandwidth is 3.12 GHz. At the same time, the interaction between the π–π noncovalent bond of PANI and the delocalized π electrons on the surface of CNTs improves the mechanical strength of Buckypaper. The tensile strength reached 42.17 MPa, an increase of 92.82% compared with pure BP/EP. The research in this article is expected to provide a feasible idea for the preparation of structure–function integrated materials.

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Preparation and microwave absorption performance of a flexible Fe₃O₄/nanocarbon hybrid buckypaper and its application in composite materials

Abstract: Flexible nanofilms are used as wave absorbing coatings for fiber/epoxy matrix to prepare lightweight wave-absorbing composites.

Cited by 13 publications

References 35 publications

Multiwalled Carbon Nanotube Buckypaper/Polyacrylonitrile Nanofiber Composite Membranes for Electromagnetic Interference Shielding

Multiwalled Carbon Nanotube Buckypaper/Polyacrylonitrile Nanofiber Composite Membranes for Electromagnetic Interference Shielding

The influence of the transparent layer thickness on the absorption capacity of epoxy/carbon nanotube buckypaper at X‐band

Microwave absorbing properties of polyaniline coated Buckypaper reinforced epoxy resin composites

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Preparation and microwave absorption performance of a flexible Fe3O4/nanocarbon hybrid buckypaper and its application in composite materials

Abstract: Flexible nanofilms are used as wave absorbing coatings for fiber/epoxy matrix to prepare lightweight wave-absorbing composites.

Cited by 13 publications

References 35 publications

Multiwalled Carbon Nanotube Buckypaper/Polyacrylonitrile Nanofiber Composite Membranes for Electromagnetic Interference Shielding

Multiwalled Carbon Nanotube Buckypaper/Polyacrylonitrile Nanofiber Composite Membranes for Electromagnetic Interference Shielding

The influence of the transparent layer thickness on the absorption capacity of epoxy/carbon nanotube buckypaper at X‐band

Microwave absorbing properties of polyaniline coated Buckypaper reinforced epoxy resin composites

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Preparation and microwave absorption performance of a flexible Fe₃O₄/nanocarbon hybrid buckypaper and its application in composite materials