Synthesis and microwave absorption properties of graphene/nickel composite materials

Abstract

Graphene/nickel composite materials were successfully prepared via a one-step in situ reduction from nickel chloride, graphene oxide, and hydrazine at 80°C for 3 h. Face-centered cubic Ni nanostructures with uniform size and high dispersion assembled on graphene sheets. Through the measurement of complex relative permittivity and permeability, their microwave absorption properties were evaluated. In comparison with pure Ni nanoparticles and graphene, the composite materials demonstrated much better characteristics of microwave absorption. The lowest reflection loss value of the composites with a thickness of 3 mm can reach -23.3 dB at 7.5 GHz. Our research reveals that graphene/Ni composites are promising microwave absorption materials with desirable absorption properties and reduced material weight.

Graphene/cobalt nanocarrier for hyperthermia therapy and MRI diagnosis

“…Graphene/cobalt nanocomposites were prepared by co-precipitation method [11,12,15]. 7 To synthesize graphene/cobalt nanocomposites, an appropriate amount of CoCl2·6H2O and GO were dissolved in deionized water to achieve 80 wt% loading of cobalt NPs to graphene in the solution [13].…”

“…Afterwards, other synthesis methods and designs for making magnetic nanocomposites were reported [13,26,27]. Recently, it was reported that due to remarkable electromagnetic performance, graphene magnetic nanocomposites can be used for microwave absorption [12,15]. To the best of our knowledge, no research was accomplished on using these nanocomposites for hyperthermia treatments.…”

“…In this research, metalo-organic molecules of cobalt-citric acid were used to fabricate graphene/magnetic metal nanocomposites, which have drawn a considerable attention for employment in specific biomedical applications, such as magnetic fluid hyperthermia (MFH) and contrast agents in magnetic resonance imaging (MRI) [10][11][12]. The effective parts, which could 5 tune and improve the MFH and MRI efficiencies, are in fact magnetic nanomaterials of high magnetic crystalline anisotropy and large magnetic moment.…”

Reduced graphene oxide decorated with in-situ growing ZnO nanocrystals: Facile synthesis and enhanced microwave absorption properties

“…However, when the loading concentration is more than 15 wt.%, the microwave absorption properties decrease. It is known that too high permittivity does harmful to the impedance matching and results in strong reflection of microwave[45]. The high loading concentration of RGO/ZnO composites deteriorates the impedance matching and hinders the microwave absorption of the sample.…”

Modal analysis of graphene microtubes utilizing a two-dimensional vectorial finite element method

“…Especially, at the far-infrared regime, the propagation of highly confined transverse magnetic (TM) surface plasmon polariton (SPP) waves is supported [10][11][12][13], permitting thus the design of efficient circuits [14][15][16][17]. The latter comprise, basically, graphene microribbons, which have been elaborately examined in previous studies through the propagation properties of the supported modes [18][19][20][21]. Actually, their straightforward planar implementation and preservation of the strong SPP confinement have enabled their use at several far-infrared applications.…”