Excellent microwave absorption property of Graphene-coated Fe nanocomposites

Abstract

Graphene has evoked extensive interests for its abundant physical properties and potential applications. It is reported that the interfacial electronic interaction between metal and graphene would give rise to charge transfer and change the electronic properties of graphene, leading to some novel electrical and magnetic properties in metal-graphene heterostructure. In addition, large specific surface area, low density and high chemical stability make graphene act as an ideal coating material. Taking full advantage of the aforementioned features of graphene, we synthesized graphene-coated Fe nanocomposites for the first time and investigated their microwave absorption properties. Due to the charge transfer at Fe-graphene interface in Fe/G, the nanocomposites show distinct dielectric properties, which result in excellent microwave absorption performance in a wide frequency range. This work provides a novel approach for exploring high-performance microwave absorption material as well as expands the application field of graphene-based materials.

Graphene-enabled electrically switchable radar-absorbing surfaces

“…Through electrostatic doping, we show that atomically thin layers can be used as a switchable radar absorbing surfaces. Graphene and carbon nanotube-based composite materials have been used as resistive materials to absorb microwaves; however, to our knowledge they have not been used for active microwave surfaces [16][17][18][19][20][21][22][23][24][25][26][27] .…”

A cost effective solution for development of broadband radar absorbing material using electronic waste

“…The absorption mechanism is generally attributed to ionic, electronic; orientation and space charge polarization appears due to diverse and heterogeneous nature of the composite material [2]. Generally, the key factors for achieving good absorption of radar wave are: (a) one is the impedance matching achieved through proper combination of the complex permittivity and permeability values of the composite material [31]. The principle of the metal-backed single layer absorber is to make use of the reflection reduction by employing impedance matching, as the reflection loss (RL) is defined in Eq.…”

“…(c) Another factor is the attenuation of wave which may be attributed to the various intrinsic loss mechanisms like conduction loss, dielectric relaxation loss, resonance loss and domain-wall motion etc. [31].…”

Fabrication of carbon encapsulated Co 3 O 4 nanoparticles embedded in porous graphitic carbon nanosheets for microwave absorber

“…The corresponding microwave absorbing materials combining magnetic and dielectric loss for attaining impedance match condition Z m = Z 0 (l r /e r ) 1/2 have been widely studied [4]. Magnetic materials as typical magnetic loss material such as Fe [5], Co [6], Ni [7], FeCo [8], FeNi [9], Fe 3 O 4 [10], NiO [11] and CoO [12], etc., have been intensively researched. Carbon materials such as carbon nanotube [13], graphene [14,15], porous carbons [16] …”