In situ etching by released proton in aniline polymerization to form network VO2 doped polyaniline composites with variable infrared emissivity for electromagnetic absorption application

Chu, Fangyuan; Cheng, Siyao; Ye, Zhimin; Wu, Fan; Zhuang, Haiyan; Dong, Wei; Xie, Aming

doi:10.1007/s42114-022-00566-4

Cited by 46 publications

(11 citation statements)

References 43 publications

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“…This will create a continuous impedance matching between the gradient pyramidal structures and free space. At the microscale, porous structures can significantly improve the absorption performance, especially for electromagnetic waves with smaller wavelengths (e.g., THz) since they experience more reflections in the pore. , …”

Section: Resultsmentioning

confidence: 99%

“…At the microscale, porous structures can significantly improve the absorption performance, especially for electromagnetic waves with smaller wavelengths (e.g., THz) since they experience more reflections in the pore. 47,48 To sum up, the excellent and ultrabroadband absorption of PGAA originates from the structure design at both the macroscale and microscale, aiming for different spectral ranges. These mechanisms will provide key guidelines for highperformance and ultrabroadband EMA design in the future.…”

Section: Electromagnetic Absorption Mechanismsmentioning

confidence: 99%

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Gradient-Reduced Graphene Oxide Aerogel with Ultrabroadband Absorption from Microwave to Terahertz Bands

Sun

Chen

Kuang

et al. 2023

ACS Appl. Nano Mater.

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Ultrabroadband electromagnetic (EM) absorbers, especially those covering microwave to terahertz (THz) bands, are urgently desired in multispectral applications such as 6G communication, radar stealth, atmospheric remote sensing, and radio astronomy. Here, we demonstrate that chemically reduced graphene oxide aerogels can be designed as an excellent absorber with the features of ultrabroadband, light weight, compressibility, and high-temperature resistance. This magnetic-free pyramidal absorber shows remarkably broad qualified absorption bandwidth from 4.7 GHz to 4 THz, with reflection loss ≤ −20 dB in the microwave and ≤ −40 dB in the THz band. Especially, an unprecedentedly excellent average absorption intensity of −53.9 dB (absorptivity over 99.999%) is obtained in the frequency range from 0.5 to 4 THz. We experimentally clarify that the gradient macrostructure together with the porous microstructure underlies the continuous impedance matching in such a large frequency range spanning about 3 orders of magnitude and leads to the consecutive strong EM absorption from microwave to terahertz. We believe that this absorber will offer multifunctional and multispectral applications in many scientific and technological fields.

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Section: Resultsmentioning

confidence: 99%

Section: Electromagnetic Absorption Mechanismsmentioning

confidence: 99%

Gradient-Reduced Graphene Oxide Aerogel with Ultrabroadband Absorption from Microwave to Terahertz Bands

Sun

Chen

Kuang

et al. 2023

ACS Appl. Nano Mater.

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“…Furthermore, several fresh peaks defined at 1480, 1400, 1293, 1239, and 1121 cm À1 in the CMP are characteristic peaks of PANI. 40,41 The C=C telescopic vibration of the benzenoid ring is responsible for the characteristic peak that was identified at 1480 cm À1 . The secondary aromatic amines' C-N stretching is where the peaks at 1293 and 1239 cm À1 come from.…”

Section: Resultsmentioning

confidence: 99%

Impedance matching optimization of hierarchical carbon fiber@MoS₂@PANI nanocomposite with core‐sheath structure for achieving excellent microwave absorption

Hu,

Zhou,

2023

Polymers for Advanced Techs

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Carbon fiber (CF) has been extensively used in the research of microwave absorption owning to its excellent performance, but it also faces a series of problems such as impedance mismatch and low absorption intensity. The core‐sheath microstructure with CF as the inner core is constructed to solve the above issues by the introduction of other sheath layers. In this work, the MoS2 sheath and polyaniline (PANI) sheath are successively introduced into the CF matrix to obtain a hierarchical CF@MoS2@PANI nanocomposite with core‐sheath structure through a straightforward hydrothermal method and in‐situ polymerization. The obtained CF@MoS2@PANI nanocomposite exhibit the minimum reflection loss value of −42.23 dB at 10.11 GHz while the thickness is 2.5 mm, much higher than those of pure CF (below −10 dB) and CF@MoS2 nanocomposite (−25.60 dB). Moreover, the distinctive hierarchical core‐sheath structure contributes to providing more active sites, prolonging the transmission path of electromagnetic waves, and forming heterogeneous interfaces. Consequently, the electromagnetic wave attenuation mechanism of CF@MoS2@PANI nanocomposite is attributed to a synergistic effect of conductive loss, multiple reflection/scattering, dipole polarization, and interface polarization. This work offers an effective and promising strategy to design a three‐dimensional hierarchical core‐sheath microstructure for the development of composite absorbers.

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“…In this section, we give a summary of oxides and their composites. The properties of some representative oxides and their composites are summarized in Table . ,,− ,,,, …”

Section: Dielectric Oxides and Compositesmentioning

confidence: 99%

Review of Dielectric Carbide, Oxide, and Sulfide Nanostructures for Electromagnetic Wave Absorption

Lu,

Zhang,

Liu

et al. 2023

ACS Appl. Nano Mater.

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Following the growth of infotech and electronic industries, electromagnetic-wave-absorbing materials play an essential role in the traction of the need for high-precision weaponry and intelligent electronic equipment. The exploitation of high-performance electromagnetic-wave-absorbing materials has emerged as a strategic challenge to be solved in the upgrading of military equipment and civil electromagnetic security. The more maturely studied absorbing materials (carbon, ferrite, etc.) have a single loss mechanism and poor resistance matching, which are already not enough to cover the basic needs. To explore absorbing materials that satisfy both impedance matching and attenuation balance, dielectric nanomaterials have come to the fore. They can realize light weight, thin layer, broad band, and multiband, which have great application prospects. In this review, we start with a summary of typical dielectric loss mechanisms (interfacial polarization, dipole polarization, and conduction loss). Next, diverse carbides, oxides, sulfides, and their composites with dielectric or magnetic materials are described, and the nanostructure advantages and wave-absorbing performance advantages are investigated. Then, the applications of wave-absorbing materials are depicted. Lastly, the challenges faced by dielectric-type materials are outlined, and future development trends are foreseen. Overall, this review offers an overview of the advances in the study of dielectric nanoabsorbing materials.

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In situ etching by released proton in aniline polymerization to form network VO2 doped polyaniline composites with variable infrared emissivity for electromagnetic absorption application

Cited by 46 publications

References 43 publications

Gradient-Reduced Graphene Oxide Aerogel with Ultrabroadband Absorption from Microwave to Terahertz Bands

Gradient-Reduced Graphene Oxide Aerogel with Ultrabroadband Absorption from Microwave to Terahertz Bands

Impedance matching optimization of hierarchical carbon fiber@MoS₂@PANI nanocomposite with core‐sheath structure for achieving excellent microwave absorption

Review of Dielectric Carbide, Oxide, and Sulfide Nanostructures for Electromagnetic Wave Absorption

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In situ etching by released proton in aniline polymerization to form network VO2 doped polyaniline composites with variable infrared emissivity for electromagnetic absorption application

Cited by 46 publications

References 43 publications

Gradient-Reduced Graphene Oxide Aerogel with Ultrabroadband Absorption from Microwave to Terahertz Bands

Gradient-Reduced Graphene Oxide Aerogel with Ultrabroadband Absorption from Microwave to Terahertz Bands

Impedance matching optimization of hierarchical carbon fiber@MoS2@PANI nanocomposite with core‐sheath structure for achieving excellent microwave absorption

Review of Dielectric Carbide, Oxide, and Sulfide Nanostructures for Electromagnetic Wave Absorption

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Impedance matching optimization of hierarchical carbon fiber@MoS₂@PANI nanocomposite with core‐sheath structure for achieving excellent microwave absorption