Lightweight SrM/CCTO/rGO nanocomposites for optoelectronics and Ku band microwave absorption

Mohammed, J.; T, Tchouank Tekou Carol; Hafeez, H.Y.; Basandrai, Deepak; Bhadu, Gopala Ram; Godara, Sachin Kumar; Narang, Sukhleen Bindra; Srivastava, A. K.

doi:10.1007/s10854-019-00690-w

Cited by 40 publications

(7 citation statements)

References 79 publications

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“…In a word, based on the various relaxation losses, multiple reflections, and electrical/magnetic-coupling effects, the NiMR-H aerogel with arrayed cell units can act as a “black hole” to highly effectively capture, block, and attenuate incident EMWs, therefore contributing to the EMA mechanism by affecting the dielectric and magnetic losses (Figure S31, Supporting Information). , …”

Section: Results and Discussionmentioning

confidence: 99%

“…In a word, based on the various relaxation losses, multiple reflections, and electrical/magnetic-coupling effects, the NiMR-H aerogel with arrayed cell units can act as a "black hole" to highly effectively capture, block, and attenuate incident EMWs, therefore contributing to the EMA mechanism by affecting the dielectric and magnetic losses (Figure S31, Supporting Information). 60 According to the EM parameters, the attenuation constant (α) calculated from eq S11 (Section S5 in the Supporting Information) determines the attenuation capability of the input EMW. 62 Here, the α values continuously increase with improving the MXene content in the NiMR-H aerogel due to the increasing number of active groups and conductivity induced by the MXene (Figure 3f and Figure S32 in the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

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Multifunctional Magnetic Ti₃C₂T_x MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Liang

Yan³

et al. 2021

ACS Nano

659

302

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Ingenious microstructure design and a suitable multicomponent strategy are still challenging for advanced electromagnetic wave absorbing (EMA) materials with strong absorption and a broad effective absorption bandwidth (EAB) at thin sample thickness and low filling level. Herein, a three-dimensional (3D) dielectric Ti3C2T x MXene/reduced graphene oxide (RGO) aerogel anchored with magnetic Ni nanochains was constructed via a directional-freezing method followed by the hydrazine vapor reduction process. The oriented cell structure and heterogeneous dielectric/magnetic interfaces benefit the superior absorption performance by forming perfect impedance matching, multiple polarizations, and electric/magnetic-coupling effects. Interestingly, the prepared ultralight Ni/MXene/RGO (NiMR-H) aerogel (6.45 mg cm–3) delivers the best EMA performance in reported MXene-based absorbing materials up to now, with a minimal reflection loss (RLmin ) of −75.2 dB (99.999 996% wave absorption) and a broadest EAB of 7.3 GHz. Furthermore, the excellent structural robustness and mechanical properties, as well as the high hydrophobicity and heat insulation performance (close to air), guarantee the stable and durable EMA application of the NiMR-H aerogel to resist deformation, water or humid environments, and high-temperature attacks.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Multifunctional Magnetic Ti₃C₂T_x MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Liang

Yan³

et al. 2021

ACS Nano

659

302

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“…Additionally, the absorption band around 437 cm −1 corresponds to the assignment of the Fe‐O bending by Fe‐O 4 and Fe‐O stretching by Fe‐O 6 while the band around 590 cm −1 corresponds to the Fe‐O stretching by Fe‐O 4 . A band around 2361 cm −1 can be observed in the samples with x = 0.2 and x = 0.4, this band can be assigned to the presence of CO 2 absorbed from the atmosphere by the sample . The lack of this peak in sample with x = 0.0 can be due to the fact that CO 2 was less in the room during the FTIR spectra recording of this sample.…”

Section: Resultsmentioning

confidence: 82%

Structural, Dielectric, and Magneto‐Optical Properties of Al‐Cr Substituted M‐Type Barium Hexaferrite

Trudel

Mohammed

Hafeez

et al. 2019

Physica Status Solidi (a)

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M‐type barium hexaferrite, BaFe12‐2xAlxCrxO19 (x = 0.0, 0.2, 0.4), is prepared using sol–gel auto‐combustion method and calcined at 1000 °C for 7 h. The effects of Al‐Cr substitution on the properties of the barium hexaferrite are investigated through XRD, FTIR, FESEM, UV‐vis‐NIR, VSM, and impedance analyzer. XRD analysis reveals the formation of hexaferrites with single phase and no impurity phase is detected. FTIR spectra show bands at 437 and 590 cm−1 which indicate the possible of hexaferrites. The micrographs of FESEM shows agglomerated grains with hexagonal plate‐like shape while the EDX spectra confirm the composition of the synthesized samples. Dielectric constant decreases abruptly at lower frequencies and an increment in dielectric constant at much higher frequency region is observed. Grain boundaries dominate the AC conductivity at lower frequencies while the grains could be responsible for the observed dispersion at higher frequencies. The values of coercivity for all the samples are found to be greater than 1200 Oe; this makes the prepared samples useful for high‐density perpendicular magnetic recording media.

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“…[ 56 ] Hexagonal ferrites with a magnetoplumbite structure and a space group of P63/mmc have long been recognized for their superior magnetic characteristics, making them ideal for MW absorption at higher frequencies and various other uses. [ 57 ] Hexaferrites have a crystal structure composed of 64 ions per unit cell that crystallize in the P63/mmc space group. One of these ions is a divalent cation, often Ba 2+ , Sr 2+ , or Pb 2+ , while the remaining 38 are O2 anions and 24 are Fe 3 cations distributed among five symmetry sites: three octahedral, one tetrahedral, and one bipyramidal.…”

Section: Hexagonal Ferritesmentioning

confidence: 99%

Recent Progress in Hexagonal Ferrites Based Composites for Microwave Absorption

Mohammed

Mohammed²,

Srivastava

2022

Cryst. Res. Technol.

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With the fast growth of wireless communication technology in high‐frequency ranges, electromagnetic (EM) interference has become a growing concern that has drawn international attention. The development of materials that can absorb EM radiation is a crucial solution. This review provides a detailed overview of ferrites, specifically hexagonal ferrites and their composites for microwave (MW) absorption. It examines hexagonal ferrite classifications based on the stacking order of their fundamental blocks and their synthesis methods and strategies for improving their magnetic properties. On the other hand, this review included a detailed examination of hexagonal ferrites–conducting polymer, hexagonal ferrites–2D materials, and hexagonal ferrite–other nanomaterials composites for MW absorption applications. Enhancing MW absorption in hexagonal ferrites‐based microwave absorption materials (MAMs) regulates their EM characteristics, improves impedance matching, and creates a diversity of loss mechanisms. In addition, the limitations, challenges, and opportunities of hexagonal ferrites‐based MAMs are discussed, which will be helpful to those working in related areas. As a general application potential, it is worth mentioning that, as a result of recent promising findings in the synthesis of hexagonal ferrites‐based composites, hexaferrite‐based composites are suitable devices in the area of microwave absorption.

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Lightweight SrM/CCTO/rGO nanocomposites for optoelectronics and Ku band microwave absorption

Cited by 40 publications

References 79 publications

Multifunctional Magnetic Ti₃C₂T_x MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Multifunctional Magnetic Ti₃C₂T_x MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Structural, Dielectric, and Magneto‐Optical Properties of Al‐Cr Substituted M‐Type Barium Hexaferrite

Recent Progress in Hexagonal Ferrites Based Composites for Microwave Absorption

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Lightweight SrM/CCTO/rGO nanocomposites for optoelectronics and Ku band microwave absorption

Cited by 40 publications

References 79 publications

Multifunctional Magnetic Ti3C2Tx MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Multifunctional Magnetic Ti3C2Tx MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Structural, Dielectric, and Magneto‐Optical Properties of Al‐Cr Substituted M‐Type Barium Hexaferrite

Recent Progress in Hexagonal Ferrites Based Composites for Microwave Absorption

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Product

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Multifunctional Magnetic Ti₃C₂T_x MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance

Multifunctional Magnetic Ti₃C₂T_x MXene/Graphene Aerogel with Superior Electromagnetic Wave Absorption Performance