Design of novel CNT/RGO/ZIF-8 ternary hybrid structure for lightweight and highly effective microwave absorption

Abstract

Carbon-nanotube-based composites are highly desirable for addressing the difficulties relevant to the quality of electromagnetic wave absorbers. The introduction of lightweight nanocomposites for constructing new structures has been widely studied due to the transformation in impedance matching and attenuation. In this paper, a novel carbon nanotube-graphene oxide-zeolitic imidazolate framework-8 (CNT/RGO/ZIF-8) ternary hybrid structure was successfully fabricated by a facile solvothermal process. The ZIF-8 was entangled initially by carbon nanotubes via the π-π interaction between organic ligands and benzene ring structure in CNT. Then, the CNT/ZIF-8 composite was immobilized on the surface of RGO by interacting with the active functional group of RGO. The structure and performance for CNT, CNT/ZIF-8, and CNT/RGO/ZIF-8 were compared to investigate the interaction mechanisms between components, and CNT/ZIF-8 exhibited a distinct improvement for microwave absorption performance. Furthermore, the introduction of RGO can accelerate the amelioration of absorption characteristics. The interfacial bonding between CNT, RGO, and ZIF-8 exerts a great influence on the absorbing quality. The mechanism of absorption of electromagnetic waves was explained by the synergistic effects of conduction loss, polarization behaviors, and eddy current. The unique structure could offer new insights to exploit advanced microwave-absorption materials.

Salt-assisted pyrolysis of carbon nanosheet and carbon nanoparticle hybrids for efficient microwave absorption

“…21 Although significant progress has been made in MOF-derived carbon MA materials, there are still some bottlenecks. Wang et al 22 reported a carbon nanotube graphene oxide zeolitic imidazolate framework-8 (CNT/RGO/ZIF-8) ternary hybrid structure. CNT/RGO/ZIF-8 has a maximum absorption of À39.2 dB at 6.5 GHz, a thickness of 4.5 mm and a fill level of 25%.…”

Hierarchically Designed Three-Dimensional Composite Structure on a Cellulose-Based Solar Steam Generator

“…The peaks of C–O (534.1 eV), C–O–C (533.0 eV), and CO (533.5 eV) were confirmed. Compared with RGO@BC and CNT@BC, as shown in Figure d,e, the core levels of O 1s are placed in the middle, which indicated the existence of π–π interactions by introducing RGO in CNT–RGO@BC . CNT@BC had the highest binding energies, which may be attributed to the close combination between CNT and BC.…”

“…Compared with RGO@BC and CNT@BC, as shown in Figure 3d,e, the core levels of O 1s are placed in the middle, which indicated the existence of π−π interactions by introducing RGO in CNT−RGO@BC. 58 CNT@BC had the highest binding energies, which may be attributed to the close combination between CNT and BC. Conversely, there were the weakest interactions between RGO and BC resulting in weaker integration among the three components.…”

NiCo@NPC@CF nanocomposites derived from NiCo-MOF/cotton for high-performance electromagnetic wave absorption

“…In addition, the growth of CNTs can be facilitated simultaneously by the catalysis effect of transition metal (Co/Ni). 19 Thus, various hierarchies have been established for EM wave absorption and weight control.…”