Synthesis and electromagnetic characterization of frequency selective radar absorbing materials using carbon nanopowders

Micheli, Davide; Vricella, A.; Pastore, Roberto; Marchetti, M.

doi:10.1016/j.carbon.2014.05.080

Cited by 303 publications

(147 citation statements)

References 66 publications

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“…Furthermore, alternative methods including using frequency selective radar absorbing materials, graded-dielectric multilayer, and employment of concise design of the microscopic structures of the fillers are promising methods for achieving high-performance microwave absorption materials and composites. [41][42][43][44][45][46][47] Moreover, the mechanical properties and the significant factors that impact the performance should be concerned. [48][49][50][51][52][53] Figure 12 displays the effective absorption bandwidth of the materials and structures.…”

Section: Resultsmentioning

confidence: 99%

Broadening Electromagnetic Absorption Bandwidth: Design from Microscopic Dielectric‐Magnetic Coupled Absorbers to Macroscopic Patterns

Liu

Wang

et al. 2017

Physica Status Solidi (a)

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As electromagnetic absorption materials with broadband absorption are highly pursued in the recent development of cutting-edge electronic and telecommunication industries, the traditional uniform bulk composites with dielectric and magnetic active absorbers are attracting extensive interest, with remaining concerns of extending the effective absorption bandwidth. To understand the impact of using dielectric-magnetic coupled absorption fillers and to implement artificial absorption structures in the absorption performance, in this work, both nanoscale nonmagnetic and magnetic graphene hybrid fillers are prepared as the effective absorbers. In the comparison based on the microscopic studies, magnetic graphene fillers are found to possess dual absorption bands in the investigation region, which is responsible for extending the effective absorption bandwidth. With subsequent macroscopic structure design based on the as-fabricated composites, the artificial structures established on the composites embedded with magnetic graphene fillers exhibit more broadened absorption bandwidth because of the exclusive advantages of absorption from multiple thickness and greater interfacial impedance matching. The results suggest that combination of developing microscopic dielectric-magnetic coupled absorbers and macroscopic structure design will fundamentally extend the effective absorption bandwidth of the electromagnetic absorption materials.

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Section: Resultsmentioning

confidence: 99%

Broadening Electromagnetic Absorption Bandwidth: Design from Microscopic Dielectric‐Magnetic Coupled Absorbers to Macroscopic Patterns

Liu

Wang

et al. 2017

Physica Status Solidi (a)

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“…Various carbon materials, e.g., carbon nanotubes (CNTs), carbon nanofi bers (CNF), carbon nanocoils, and mesoporous carbon, have been utilized to construct highly effective microwave absorbers in the past decades. [6][7][8][9][10][11][12] Although these carbon-based materials have made signifi cant progress in the fi eld of microwave absorption, some elaborate innovations on structure and components are still paving the way for exciting performance to satisfy the requirements of practical applications.Recently, graphene appeared as a fascinating material and grabbed worldwide attention, whose unprecedented physical and chemical properties derived from its unique 2D structure have promised great potential in many research fi elds. [ 13 ] Notably, high charge carrier mobility, extraordinary electrical and thermal conductivity also rendered graphene as a new microwave absorber, and it was found that reduced graphene oxide (rGO) provided superior microwave absorption to graphene oxide (GO).…”

mentioning

confidence: 99%

Interfacially Engineered Sandwich‐Like rGO/Carbon Microspheres/rGO Composite as an Efficient and Durable Microwave Absorber

Wang

Qiang

et al. 2016

Adv Materials Inter

137

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EM pollution, because they can convert the EM energy into thermal energy or dissipate the EM waves through interference. [ 4,5 ] Among many kinds of microwave absorbers, carbon materials are always the most attractive candidates due to their tunable properties, relative low density, abundant resource, easy preparation, and low cost. Various carbon materials, e.g., carbon nanotubes (CNTs), carbon nanofi bers (CNF), carbon nanocoils, and mesoporous carbon, have been utilized to construct highly effective microwave absorbers in the past decades. [6][7][8][9][10][11][12] Although these carbon-based materials have made signifi cant progress in the fi eld of microwave absorption, some elaborate innovations on structure and components are still paving the way for exciting performance to satisfy the requirements of practical applications.Recently, graphene appeared as a fascinating material and grabbed worldwide attention, whose unprecedented physical and chemical properties derived from its unique 2D structure have promised great potential in many research fi elds. [ 13 ] Notably, high charge carrier mobility, extraordinary electrical and thermal conductivity also rendered graphene as a new microwave absorber, and it was found that reduced graphene oxide (rGO) provided superior microwave absorption to graphene oxide (GO). [ 14,15 ] However, sole graphene material suffers from limited loss mechanism caused by interfacial impedance mismatching, [ 15,16 ] thus it is usually employed as EM interference shielding material rather than EM absorbing material. [17][18][19] Incorporation of other lossy materials, especially magnetic metal and metal oxides, has been widely studied as the imperative solution to improve the matching of characteristic impedance and enhance the microwave absorption performance. [20][21][22][23][24][25][26][27][28][29] For example, graphene-coated Fe nanocomposites and Ni/graphene composites showed enhanced microwave absorption due to the charge transfer at metal/graphene interface and the polarization of free carriers; [ 20,21 ] Fe 3 O 4 /graphene, rGO-Fe 2 O 3 , and rGO/CNT-Fe 3 O 4 materials demonstrated optimum characteristic impedance and compatible dielectric and magnetic loss, which resulted in their strong refl ection loss in the frequency range of 12.0-16.0 GHz; [21][22][23] Graphene decorated with coreshell Fe@Fe 3 O 4 @ZnO nanoparticles was also fabricated, and Graphene-based composites offer immense potential for overcoming the challenges related to the performance, functionality, and durability in microwave absorption. In this study, a sandwich-like graphene-based composite is successfully fabricated by an interfacial engineering of amorphous carbon microspheres (ACMs) and reduced graphene oxide (rGO), with a structure of rGO/ACMs/rGO. The as-prepared rGO/ACMs/rGO composite presents comparable/superior refl ection loss characteristics in the frequency range of 2.0-18.0 GHz to previous composites of graphene and high-density magnetic particles. Electromagnetic parameters and simulation resu...

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“…Conducting polymers are used in solar cells, 5 field effect transistors, 6 organic light-emitting diodes (OLEDs), 7 and because of their strong absorption in the microwave and millimeter wave range, in absorbing paints in the defense industry. 8 Polyaniline (PANI) has been widely studied and is referred to as either emeraldine base (EB) when the aniline monomers are combined to form an insulating polymer, and conversely is referred to as emeraldine salt (ES) when "protonated" to form a conductive polymer. The term emeraldine, stems from the greenish tint of PANI first observed in the early 1900s.…”

Section: Introductionmentioning

confidence: 99%

Electrodynamics of the conducting polymer polyaniline on the insulating side of the metal-insulator transition

Helgren

Penney²,

Diefenbach

et al. 2017

Phys. Rev. B

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Conducting polymer samples of Polyaniline (PANI) exhibit a dramatic change in their conductivity as function of protonation level, analogous with the changes in the transport properties of semiconductors upon doping. In this work PANI samples were prepared by protonating with varying concentrations of hydrochloric acid. The complex terahertz frequency-dependent conductivity and the dc conductivity of these samples were measured and analyzed in the framework of the disorder-driven, metal-insulator quantum phase transition. The samples were determined to all fall on the insulating phase of this phase transition. The frequency dependence of both the real and imaginary terahertz conductivity are found to be consistent with theories that include electronic correlation effects.

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Synthesis and electromagnetic characterization of frequency selective radar absorbing materials using carbon nanopowders

Cited by 303 publications

References 66 publications

Broadening Electromagnetic Absorption Bandwidth: Design from Microscopic Dielectric‐Magnetic Coupled Absorbers to Macroscopic Patterns

Broadening Electromagnetic Absorption Bandwidth: Design from Microscopic Dielectric‐Magnetic Coupled Absorbers to Macroscopic Patterns

Interfacially Engineered Sandwich‐Like rGO/Carbon Microspheres/rGO Composite as an Efficient and Durable Microwave Absorber

Electrodynamics of the conducting polymer polyaniline on the insulating side of the metal-insulator transition

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