Aerogels of V2O5 nanowires reinforced by polyaniline for electromagnetic interference shielding

Narayanan, Aparna Puthiyedath; Unni, K. N. Narayanan; Surendran, Kuzhichalil Peethambharan

doi:10.1016/j.cej.2020.127239

Cited by 43 publications

(26 citation statements)

References 62 publications

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“…The value of SSE increased with coating cycles; for example, it was 7.2 dB cm 3 g –1 for the sample under one cycle, whereas it reached to the maximum of 73.0 dB cm 3 g –1 for the sample under four cycles. The value of SSE was lower than those of many aerogels or foams reported in published studies. , This was attributed to the fact that the existence of ULFs inevitably increased the density of composite aerogels leading to the unremarkable SSE. Even so, the result still exceeded the values of some high-performance porous materials .…”

Section: Resultsmentioning

confidence: 59%

“…The value of SSE was lower than those of many aerogels or foams reported in published studies. 59,60 This was attributed to the fact that the existence of ULFs inevitably increased the density of composite aerogels leading to the unremarkable SSE. Even so, the result still exceeded the values of some high-performance porous materials.…”

Section: Improved Thermal Stability and Flamementioning

confidence: 99%

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Leather Solid Waste/Poly(vinyl alcohol)/Polyaniline Aerogel with Mechanical Robustness, Flame Retardancy, and Enhanced Electromagnetic Interference Shielding

Zhang

Zeng

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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Renewable biobased aerogels display a promising potential to fulfill the surging demand in various industrial sectors. However, its inherent low mechanical robustness, flammability, and lack of functionality are still huge obstacles in its practical application. Herein, a novel integrated leather solid waste (LSW)/ poly(vinyl alcohol) (PVA)/polyaniline (PANI) aerogel with high mechanical robustness, flame retardancy, and electromagnetic interference (EMI) shielding performance was successfully prepared. Amino carboxyl groups in LSW could be effectively exposed by solid-state shear milling (S 3 M) technology to form strong hydrogen-bond interactions with the PVA molecular chains. This led to a change in the compressive strength and the temperature of the initial dimensional change to 15.6 MPa and 112.7 °C at a thickness of 2.5 cm, respectively. Moreover, LSW contains a large number of N elements, which ensures a nitrogen-based flame-retardant mechanism and increase in the limit oxygen index value of LSW/PVA aerogel to 32.0% at a thickness of 2.5 mm. Notably, by the cyclic coating method, a conductive PANI layer could be polymerized on the surface of LSW/PVA aerogel, which led to the construction of a sandwich structure with impressive EMI shielding capability. The EMI shielding effectiveness (SE) reached more than 40 dB, and the specific shielding effectiveness (SSE) reached 73.0 dB cm 3 g −1 . The inherent dipoles in collagen fibers and the conductive PANI synergistically produced an internal multiple reflection and absorption mechanism. The comprehensive performance of LSW/PVA/PANI aerogel not only demonstrates a new strategy to recycle LSW in a more value-added way but also sheds some more light on the development of biomass aerogels with high-performance, environmentally friendly, and cost-effective properties.

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Section: Resultsmentioning

confidence: 59%

Section: Improved Thermal Stability and Flamementioning

confidence: 99%

Leather Solid Waste/Poly(vinyl alcohol)/Polyaniline Aerogel with Mechanical Robustness, Flame Retardancy, and Enhanced Electromagnetic Interference Shielding

Zhang

Zeng

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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“…Thus, “green shielding material” not only protects the internal workspace from EM waves but also is friendly to the other living bodies and devices in the vicinity (external environment) . Among the fabricated multilayered constructs, PC/PF/CP/PC and PC/PF/CP/PC–CNT showed g s values (@8.2 GHz) as high as 7.0 and 8.6, respectively, some of the highest reported in the literature so far . The reflection coefficient ( R ) for these samples at 8.2 GHz is as low as approximately 0.12 and 0.10, respectively, among the lowest reported so far .…”

Section: Resultsmentioning

confidence: 89%

Absorption Dominated Directional Electromagnetic Interference Shielding through Asymmetry in a Multilayered Construct with an Exceptionally High Green Index

Sushmita

Ghosh

Nilawar

et al. 2022

ACS Appl. Mater. Interfaces

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Fabricating green electromagnetic interference (EMI) shields is the need of the hour because strong secondary reflections in the vicinity of the shield adversely affect the environment and the reliability of the neighboring devices. To this end, the present work aims to maximize the absorption-based EMI shielding through a multilayered construct comprising a porous structure (pore size less than λ/5), a highly conducting entity, and a layer to match the impedance. The elements of this construct were positioned so that the incoming electromagnetic (EM) radiation interacts with the other layers of the construct before the conducting entity. This positioning of the layers in the construct offers a high green shielding index (g s) and low reflection coefficient (R ∼ 0.1) with an exceptionally high percent absorption (up to 99%). Polyurethane (PU) foams were fabricated using the salt-leaching technique and strategically positioned with carbon nanotube (CNT) papers and polycarbonate (PC)-based films to obtain symmetric and asymmetric constructs. These structures were then employed to gain mechanistic insight into the directional dependency of shielding performance, g s, and heat dissipation ability. Interestingly, maximum total shielding effectiveness (SET) of −52 dB (88% absorption @8.2 GHz) and specific shielding effectiveness/thickness (SSEt) of −373 dB/cm2g were achieved for a symmetric construct whereas, for the asymmetric construct, the SET and SSEt were −37 dB and −280 dB/cm2g, respectively, with an exceptionally high g s of 8.6, the highest reported so far. The asymmetricity in the construct led to directional dependence of the absorption component (% SEA, shielding effectiveness due to absorption) and heat dissipation, primarily governed by the electrical and thermal conductivity gradient, respectively. This study opens new avenues in this field and reports constructs with an exceptionally high green index.

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“…They exhibited an impressive EMI SE of ∼34.7 dB at a nominal density of ∼0.02 g cm −3 . 35 The present study demonstrates another fruitful and facile strategy to synthesize a green polymer composite aerogel with more efficient EMI shielding. Herein, V 2 O 5 hydrogel synthesized by a simple one-pot hydrothermal method was reinforced by conducting polymer polyaniline followed by a freeze-drying process to obtain V 2 O 5 –polyaniline aerogel.…”

Section: Introductionmentioning

confidence: 84%

Outstanding electromagnetic interference shielding performance in hydrothermally derived vanadium pentoxide–polyaniline aerogels

Narayanan

Surendran

2022

J. Mater. Chem. C

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Aerogels of V2O5 nanowires reinforced by polyaniline for electromagnetic interference shielding

Cited by 43 publications

References 62 publications

Leather Solid Waste/Poly(vinyl alcohol)/Polyaniline Aerogel with Mechanical Robustness, Flame Retardancy, and Enhanced Electromagnetic Interference Shielding

Leather Solid Waste/Poly(vinyl alcohol)/Polyaniline Aerogel with Mechanical Robustness, Flame Retardancy, and Enhanced Electromagnetic Interference Shielding

Absorption Dominated Directional Electromagnetic Interference Shielding through Asymmetry in a Multilayered Construct with an Exceptionally High Green Index

Outstanding electromagnetic interference shielding performance in hydrothermally derived vanadium pentoxide–polyaniline aerogels

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