Novel microwave absorbers based on polypyrrole and carbon quantum dots

Rahal, Michel; Atassi, Yomen; Ali, Nassim Nasser; Alghoraibi, Ibrahim

doi:10.1016/j.matchemphys.2020.123491

Cited by 23 publications

(11 citation statements)

References 43 publications

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“…The typical peaks of pyrrole‐ring at 1635 and 1408 cm −1 are gradually decreased with increasing CQDs concentration as displayed in Figure 2D; it may be the formation of physical interaction in‐between the PPy and CQDs. which would reduce the vibrational peaks intensity of pyrrole ring, which provides the hypothesis of physical interaction amid the PPy and CQDs 43,44 …”

Section: Resultsmentioning

confidence: 99%

Fabrication of semi‐flexible carbon quantum dots‐reinforced polypyrrole ( PPy / CQDs ) composite electrodes by hybrid electrospray deposition for high‐performance energy storage device

Dhandapani¹,

Prabhu

Duraisamy³

et al. 2022

Intl J of Energy Research

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Summary A carbon quantum dots‐reinforced polypyrrole (PPy/CQDs) composite electrodes were prepared via the hybrid electrospray method. PPy/CQDs composite shows superior electrochemical performance with a specific capacity (Qg) of 174.21 C g−1 at 1 A g−1 in 3 M KOH aqueous electrolyte. An all‐solid‐state asymmetric supercapacitor (ASC) is composed of PPy/CQDs as a positive electrode and rGO as a negative electrode with PVA/KOH gel electrolyte, which exhibited the specific capacity (Qg) of 79.25 C g−1 at the current density of 1.5 A g−1 with an energy and power density of 26.44 Wh kg−1 and 18 090.82 W kg−1, respectively. An assembled PPy/CQDs//rGO device offers cyclic retention of about 76.8% at 15 A g−1 after 10 000 cycles. The above results confirmed that the as‐prepared PPy/CQDs composite electrode is more suitable for high‐performance‐based semi‐flexible supercapacitor application.

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Section: Resultsmentioning

confidence: 99%

Fabrication of semi‐flexible carbon quantum dots‐reinforced polypyrrole ( PPy / CQDs ) composite electrodes by hybrid electrospray deposition for high‐performance energy storage device

Dhandapani¹,

Prabhu

Duraisamy³

et al. 2022

Intl J of Energy Research

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“…The RL was studied to evaluate the EMWAPs of the PPy nanostructures at various [HCl], as shown in Figure 9 and Table 1 [47][48][49][50][51][52][53][54][55][56]. The PPy planar helix formed at [HCl]=0 M exhibits a wide absorption band over the frequency ranges of 3-18 GHz (Figure 9(a2)), corresponding to the λ/4 damping model.…”

Section: Em Propertiesmentioning

confidence: 99%

“…PPy and carbon quantum dots 25 −27.82 6.9 3.25 2.34 [47] Fe According to the Debye theory f f ( ) = 1 2 + [27,28],…”

Section: Absorbersmentioning

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.

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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).

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“…4 Indeed, recent research works aim to develop new shielding materials and most of the furnished efforts have been mainly focused on solving this issue using a new generation of conducting polymer composites films due to their many advantages. [5][6][7] In this context, conducting polymers such as polyaniline (PANI), 8,9 polythiophene (PT), 7,8,10 polypyrrole (PPy), [11][12][13][14] and their composites reinforced with metallic particles such as gold, silver, platinum, and copper, are considered to be the most load-bearing materials. 15 Recently, silver nanoparticles are being recommended for the preparation of conductive composite materials, due to their high electrical conductivity and low manufacturing cost.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic interference shielding effectiveness of polypyrrole-silver nanocomposite films on silane-modified flexible sheet

Benzaoui

Ales

Mekki

et al. 2021

High Performance Polymers

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The conventional electromagnetic interference (EMI) shielding materials are being gradually replaced by a new generation of supported conducting polymer composites (CPC) films due to their many advantages. This work presents a contribution on the effects of silane surface–modified flexible polypyrrole-silver nanocomposite films on the electromagnetic interference shielding effectiveness (EMI-SE). Thus, the UV-polymerization was used to in-situ deposit the PPy-Ag on the biaxial oriented polyethylene terephthalate (BOPET) flexible substrates whose surfaces were treated by 3-aminopropyltrimethoxysilane (APTMS). X-ray Photoelectron Spectroscopy (XPS) analyzes confirmed the APTMS grafting procedure. Structural, morphological, thermal, and electrical characteristics of the prepared films were correlated to the effect of substrate surface treatment. Thereafter, EMI-SE measurements of the elaborated films were carried out as per ASTM D4935 standard for a wide frequency band extending from 50 MHz to 18 GHz. The obtained results confirmed that the APTMS-treated BOPET film exhibit higher EMI shielding performance and better electrical characteristics compared to the untreated film. In fact, a 32% enhancement of EMI-SE was noted for the treated films compared to the untreated ones. Overall, these results put forward the role played by the surface treatment in strengthening the position of flexible PPy-Ag supported films as high-performance materials in electronic devices and electromagnetic interference shielding applications.

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Novel microwave absorbers based on polypyrrole and carbon quantum dots

Cited by 23 publications

References 43 publications

Fabrication of semi‐flexible carbon quantum dots‐reinforced polypyrrole ( PPy / CQDs ) composite electrodes by hybrid electrospray deposition for high‐performance energy storage device

Fabrication of semi‐flexible carbon quantum dots‐reinforced polypyrrole ( PPy / CQDs ) composite electrodes by hybrid electrospray deposition for high‐performance energy storage device

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

Electromagnetic interference shielding effectiveness of polypyrrole-silver nanocomposite films on silane-modified flexible sheet

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