Research on high electromagnetic interference shielding effectiveness of a foldable buckypaper/polyacrylonitrile composite film via interface reinforcing

Xia, Qianshan; Zhang, Zhichun; Chu, Hetao; Liu, Yanju; Leng, Jinsong

doi:10.1016/j.compositesa.2018.07.019

Cited by 33 publications

(24 citation statements)

References 54 publications

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“…In this study, electromagnetic waves were applied to the MWCNT/PVA buckypaper surface, and parameters like reflection (SER), absorption (SEA) and multiple reflection (SEMR) were collected. For reference, materials with 20 dB EMI shielding effectiveness (criteria for commercial applications) can shield 99% of electromagnetic waves [ 52 , 53 ].…”

Section: Resultsmentioning

confidence: 99%

Multi-Functional Properties of MWCNT/PVA Buckypapers Fabricated by Vacuum Filtration Combined with Hot Press: Thermal, Electrical and Electromagnetic Shielding

et al. 2020

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The applications of pure multi-walled carbon nanotubes (MWCNTs) buckypapers are still limited due to their unavoidable micro/nano-sized pores structures. In this work, polyvinyl alcohol (PVA) was added to a uniform MWCNTs suspension to form MWCNT/PVA buckypapers by vacuum infiltration combined with a hot press method. The results showed an improvement in the thermal, electrical, and electromagnetic interference (EMI) shielding properties due to the formation of dense MWCNTs networks. The thermal and electrical properties rose from 1.394 W/m·k to 2.473 W/m·k and 463.5 S/m to 714.3 S/m, respectively. The EMI performance reached 27.08 dB. On the other hand, ABAQUS finite element software was used to simulate the coupled temperature-displacement performance. The electronic component module with buckypapers revealed a homogeneous temperature and thermal stress distribution. In sum, the proposed method looks promising for the easy preparation of multi-functional nanocomposites at low-cost.

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Section: Resultsmentioning

confidence: 99%

Multi-Functional Properties of MWCNT/PVA Buckypapers Fabricated by Vacuum Filtration Combined with Hot Press: Thermal, Electrical and Electromagnetic Shielding

et al. 2020

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“…Fracture elongation of 0.5 CNT films/SR is the minimum among the four samples due to a big gap of intrinsic strains between CNT films and SR matrix. However, it is still improved with complementarity from durability of SR matrix, compared to the ones of other pure 2D microstructured CNT assemblies [43,44]. More details of mechanical properties can be found in table S1 (See the supplementary material).…”

Section: Characterization Of Cnt Films and Cnt/sr Compositesmentioning

confidence: 99%

Preparation and characterization of CNT films/silicone rubber composite with improved microwave absorption performance

Shen

Yao

Liu

et al. 2019

Mater. Res. Express

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Fabrications of CNT films/SR and CNT powders/SR composites are introduced to provide the rational comparisons of their thermal, mechanical and electrical properties in this work. The growth of CNT films is firstly prepared with floating catalyst chemical vapor deposition (FCCVD) method. CNT films belong to multi-walled CNT and mesoporous characteristic by Raman and nitrogen adsorption-desorption measurements, respectively. CNT films/SR composite also presents better microwave absorption performances with the low-level CNT loadings (0.5 wt%), compared to the CNT powders/SR composites. It exhibits the minimum reflection loss (RL min ) of the CNT films/SR composite is −26.55 dB and related effective absorption bandwidth (RL<−10 dB) of 3.57 GHz) with 1 mm thickness. A proposed absorption mechanism is attributed to optimized impedance matching and enhanced conductive/dielectric losses in the CNT films/SR absorber.

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“…BPs are commonly prepared from vacuum filtration of an aqueous suspension of CNTs, which results in a porous film formed from randomly distributed CNTs interconnected by van der Waals forces. [21][22][23] One of buckypapers advantages is associated with their safe manipulation compared to the individual nanofillers and the porous structure, which facilitates their impregnation by polymer matrixes. 24 The dense CNTs structure promotes several conducting paths, which facilitate electrical conduction and electromagnetic shielding applications.…”

Section: Introductionmentioning

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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Research on high electromagnetic interference shielding effectiveness of a foldable buckypaper/polyacrylonitrile composite film via interface reinforcing

Cited by 33 publications

References 54 publications

Multi-Functional Properties of MWCNT/PVA Buckypapers Fabricated by Vacuum Filtration Combined with Hot Press: Thermal, Electrical and Electromagnetic Shielding

Multi-Functional Properties of MWCNT/PVA Buckypapers Fabricated by Vacuum Filtration Combined with Hot Press: Thermal, Electrical and Electromagnetic Shielding

Preparation and characterization of CNT films/silicone rubber composite with improved microwave absorption performance

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

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