Application progress of conductive conjugated polymers in electromagnetic wave absorbing composites

Lan, Di; Gao, Zhenguo; Zhao, Zijie; Kou, Kaichang; Wu, Hongjing

doi:10.1016/j.coco.2021.100767

Cited by 72 publications

(24 citation statements)

References 170 publications

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“…Scheme 2 shows a possible EMW absorption mechanism for S-5, which implies that the excellent absorption performance comes as a result of multiple mechanisms. Due to the large specific surface area of the composite material, it is easy to form a conductive network, which is conducive to induced current transmission under the action of the external magnetic field, causing the internal electrons to undergo directional migration and converting electromagnetic energy into thermal energy [68,69]. On the one hand, the incident EMW that can enter the material is reflected and scattered, with large amount of EMW attenuating in the process [70].…”

Section: Microwave Absorption and Mechanismmentioning

confidence: 99%

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

et al. 2021

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Layered double hydroxides (LDHs) have a special structure and atom composition, which are expected to be an excellent electromagnetic wave (EMW) absorber. However, it is still a problem that obtaining excellent EMW-absorbing materials from LDHs. Herein, we designed heterostructure NiCo-LDHs@ZnO nanorod and then subsequent heat treating to derive NiCo@C/ZnO composites. Finally, with the synergy of excellent dielectric loss and magnetic loss, an outstanding absorption performance could be achieved with the reflection loss of − 60.97 dB at the matching thickness of 2.3 mm, and the widest absorption bandwidth of 6.08 GHz was realized at 2.0 mm. Moreover, this research work provides a reference for the development and utilization of LDHs materials in the field of microwave absorption materials and can also provide ideas for the design of layered structural absorbers.

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Section: Microwave Absorption and Mechanismmentioning

confidence: 99%

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

et al. 2021

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“…Contrarily, the ε′ value of PINF/MA dropped from a high value of 9.1 to 3.1, which can be explained by the increase in the polarization hysteresis . It is widely acknowledged that the resonance behavior of dielectric materials largely depends on the ion polarization, interfacial polarization, electronic polarization, dipolarization, and space charge polarization. , In this case, the increase in ε″ for the composite aerogel is mainly attributed to the enhancement of dipolar polarization caused by the functional groups and defects of the Ti 3 C 2 T x sheet and the interfacial polarization between the dipoles. Hence, MXene can effectively increase the consumption ability of composite aerogel toward electromagnetic waves.…”

Section: Resultsmentioning

confidence: 97%

Polyimide Nanofiber-Reinforced Ti₃C₂T_x Aerogel with “Lamella-Pillar” Microporosity for High-Performance Piezoresistive Strain Sensing and Electromagnetic Wave Absorption

Liao

Liu

et al. 2021

ACS Appl. Mater. Interfaces

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Assembling two-dimensional MXenes into 3D macroscopic structures is an applicable method to give full play to its excellent electrical and mechanical properties toward multi-functionality. Considering the weak interfacial interaction and poor gelation ability of MXenes, short polyimide nanofibers (PINFs) are utilized as cross-linking and supporting building blocks in this work to construct a lightweight, robust, and elastic PINF/Ti3C2T x MXene composite aerogel (PINF/MA) via a simple synergistic assembly strategy. Taking advantage of its unique 3D “lamella-pillar” microporous architecture, the designed PINF/MA composite aerogel exhibits excellent piezoresistive sensing performance in terms of a wide pressure range of 0–8 kPa (50% strain), a high piezoresistive sensitivity of 22.32 kPa–1, an ultra-low detection limit of 0.1% strain, and great compression/rebound stability (signal remained stable after 1500 cycles). These remarkable piezoresistive sensing properties enable the PINF/MA with intriguing capability to detect small and large human activities in real time (wrist and finger bending, pulse, and vocal cord vibration). More interestingly, the parallelly aligned leaf vein-like lamellae also empower the PINF/MA with prominent wave absorption performance [RLmin is −40.45 dB at 15.19 GHz, with an effective absorption bandwidth of 5.66 GHz (12.34–18 GHz)], making the multi-functional PINF/MA composite aerogels promising candidates for wearable strain sensors and microwave absorbers.

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“…A vector network analyzer (Anritsu MS46322B) was utilized to characterize the EM parameters (complex permittivity [ε r = ε″ − jε ″] and permeability [μ r = μ″ − jμ ″]) by a typical coaxial‐line method. According to the transmission line theory, EMW absorption performance was calculated based on following equation: [ 65 ]

\begin{matrix} R L (d B) = 20 \log (||, \frac{Z_{i n} - Z_{0}}{Z_{i n} + Z_{0}}) \end{matrix}

\begin{matrix} Z_{in} = Z_{0} \sqrt{\frac{μ_{r}}{ε_{r}}} \tanh (j \frac{2 π f d}{c} \sqrt{μ_{r} ε_{r}}) \end{matrix}

where Z in , Z 0 , f , d , and c were input impedance of EMAs, impedance of free space, incident EMW frequency, thickness of absorbers, and velocity of light. For detection, all EMAs (30.0 wt%) were constructed to 3.0 mm thick cylinders ( Φ in = 3.04 mm, Φ out = 7.00 mm) in paraffin.…”

Section: Methodsmentioning

confidence: 99%

Synergistic Polarization Loss of MoS₂‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption

Gao

Lan

et al. 2022

Adv Funct Materials

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159

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Given tunable hybridization structures in solid solutions, fascinating electromagnetic (EM) properties can be achieved for regulating EM wave (EMW) absorption. Herein, a novel metal–organic cooperative interactions method is proposed to manipulate the vacancy, interstitial, substitutional, and heterointerface structures in molybdenum disulfide (MoS2) solid solution simultaneously, thence meeting the synergistic polarization loss on various point and face sites. Assisted by the coordination between Cu2+ and polydopamine (PDA), the effect of Cu modification on MoS2 is highly improved, which further lead to polarization loss on S vacancy, interstitial Cu, substitutional N, and heterointerface between carbon and MoS2. Contributing to the synergetic effect among multiple polarizations, the Cu/C@MoS2 solid solution exhibit ultrahigh EMW absorption performance, of which EMA with twice PDA delivers the effective absorption bandwidth of 7.12 GHz and minimum reflection loss of −48.22 dB (2.5 mm). The energy attenuation of Cu/C@MoS2 improved almost 266.7% and 222.2% than C@MoS2 and Cu@MoS2, respectively. Finally, this work reveals the structural dependency of solid solution materials of EMW absorption and establishes an entirely new polarization loss model.

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Application progress of conductive conjugated polymers in electromagnetic wave absorbing composites

Cited by 72 publications

References 170 publications

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

Polyimide Nanofiber-Reinforced Ti₃C₂T_x Aerogel with “Lamella-Pillar” Microporosity for High-Performance Piezoresistive Strain Sensing and Electromagnetic Wave Absorption

Synergistic Polarization Loss of MoS₂‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption

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Application progress of conductive conjugated polymers in electromagnetic wave absorbing composites

Cited by 72 publications

References 170 publications

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

Construction of 1D Heterostructure NiCo@C/ZnO Nanorod with Enhanced Microwave Absorption

Polyimide Nanofiber-Reinforced Ti3C2Tx Aerogel with “Lamella-Pillar” Microporosity for High-Performance Piezoresistive Strain Sensing and Electromagnetic Wave Absorption

Synergistic Polarization Loss of MoS2‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption

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Polyimide Nanofiber-Reinforced Ti₃C₂T_x Aerogel with “Lamella-Pillar” Microporosity for High-Performance Piezoresistive Strain Sensing and Electromagnetic Wave Absorption

Synergistic Polarization Loss of MoS₂‐Based Multiphase Solid Solution for Electromagnetic Wave Absorption