Large-Scale Synthesis of Three-Dimensional Reduced Graphene Oxide/Nitrogen-Doped Carbon Nanotube Heteronanostructures as Highly Efficient Electromagnetic Wave Absorbing Materials

Abstract

Herein, we use reduced graphene oxide as a substrate and NiFe as a catalyst to fabricate three-dimensional (3D) nitrogen-doped carbon nanotube (NCNT)/reduced graphene oxide heteronanostructures (3D NiFe/N-GCTs). The 3D NiFe/N-GCTs are composed of two-dimensional (2D) reduced graphene oxide-supported one-dimensional (1D) NiFe nanoparticle-encapsulated NCNT arrays. The NCNTs exhibit bamboo-like shapes with the length and diameter of 3–10 μm and 15–45 nm, respectively. Besides integration of advantages of 1D and 2D nanomaterials, the 3D NiFe/N-GCT heteronanostructure possesses interconnected network structures, sufficient interfaces, numerous defects, hundreds of void spaces enclosed by bamboo joints and the walls of the NCNT in an individual carbon nanotube, and large surface areas, which can improve their dielectric losses toward electromagnetic wave. Thus, the 3D NiFe/N-GCTs show satisfied property toward electromagnetic wave absorption. Typically, the optimized 3D NiFe/N-GCT displays excellent minimal reflection loss (−40.3 dB) and outstanding efficient absorption bandwidth (4.5 GHz), outperforming most of the reported absorbers. Remarkably, the synthesis of 3D NiFe/N-GCTs only involves vacuum freeze-drying and subsequent thermal treatment process at a high temperature, and thus, the large-scale production of 3D NiFe/N-GCTs can be achieved in each batch, affording the possibility of the practical applications of the 3D NiFe/N-GCTs.

A Nano-Micro Engineering Nanofiber for Electromagnetic Absorber, Green Shielding and Sensor

“…EM functional materials have always been a hot spot in the information explosion era, and their applications in ultra-long-distance energy transmission, military stealth camouflage, and anti-interference of electrical equipment cannot be ignored [12][13][14][15][16][17][18][19]. Generally, the EM absorption mechanism fatefully depends on the impedance matching level, and incident EM wave is attenuated by dielectric or/ and magnetic losses [20][21][22][23][24][25][26][27][28].…”

Synthesizing High‐quality Graphene from Spent Anode Graphite and Further Functionalization Applying in ORR Electrocatalyst

“…Meanwhile, graphene is undoubtfully the most intensively studied two‐dimensional material owing to its unrivalled properties, such as ultrahigh Yong's modulus, fast charge carrier mobility, outstanding thermal stability, transmittance, and high conductivity [4–10] . Although various manufacturing methods have been developed to prepare graphene slices since Novoselov and Geim isolated single layer graphene with scotch tapes in 2004, [11–16] oxidation‐reduction method is still the most preferred route for large‐scale graphene production as a result of its low‐cost and fabricating friendliness [17–21] . Based on the necessary of recycling of spent anode graphite and high value of graphene, recently, more efforts have been devoted into the reusing of these dumped graphite to prepare the graphene.…”

“…[4][5][6][7][8][9][10] Although various manufacturing methods have been developed to prepare graphene slices since Novoselov and Geim isolated single layer graphene with scotch tapes in 2004, [11][12][13][14][15][16] oxidationreduction method is still the most preferred route for largescale graphene production as a result of its low-cost and fabricating friendliness. [17][18][19][20][21] Based on the necessary of recycling of spent anode graphite and high value of graphene, recently, more efforts have been devoted into the reusing of these dumped graphite to prepare the graphene. Some reports [22][23][24] still continued to employ traditional Hummers method to synthesis the graphene oxide, then reduced through hydrazine hydrate.…”

Hollow CoS2 Nanobubble Prisms Derived from ZIF‐67 through Facile Two‐Step Self‐Engaged Method for Electromagnetic Wave Absorption

“…[1][2][3] These arising challenges generate demands for developing superior microwave absorption materials to shield electromagnetic interference. [4][5][6] Controlling chemical composition and nanostructures of microwave absorption materials have been demonstrated effective for designing new candidates. [7][8][9] Especially, the hollow architectures have become desirable candidates own to low density and multiple reflections in the inner cavities, such as core-shell/yolk-shell and hollow structures.…”