Flexible rGO/Fe₃O₄ NPs/polyurethane film with excellent electromagnetic properties*

Abstract

Large-area and flexible reduced graphene oxide (rGO)/Fe3O4 NPs/polyurethane (PU) composite films are fabricated by a facile solution-processable method. The monolayer assembly of Fe3O4 nanoparticles with a high particle-stacking density on the graphene oxide (GO) sheets is achieved by mixing two immiscible solutions of Fe3O4 nanoparticles in hexane and GO in dimethylformide (DMF) by a mild sonication. The x-ray diffraction and Raman spectrum confirm the reduced process of rGO by a simple thermal treatment. The permittivity value of the composite in a frequency range of 0.1 GHz–18 GHz increases with annealing temperature of GO increasing. For 5-wt% rGO/Fe3O4 NPs/PU, the maximum refection loss (RL) of over −35 dB appears at 4.5 GHz when the thickness of film increases to 5 mm. The rGO/Fe3O4 NPs/PU film, exhibiting good electromagnetic properties over GHz frequency range, could be a potential candidate as one of microwave absorption materials in flexible electronic devices.

Robustness of transport properties to bending angles from edge-state contributions in flexible MoS2 nanoribbon

“…Flexible electronics enable electronic devices to maintain their original performance despite being twisted, folded, stretched, and undergoing other shape changes [1][2][3]. They can be used as wearable devices, electronic skin, flexible displays, and more [4][5][6].…”

Enhanced microwave absorption performance of MOF-derived hollow Zn-Co/C anchored on reduced graphene oxide*

“…[24,25] Therefore, numerous methods have been researched to rationally synthesize and change the structure of GO composites. [26][27][28][29][30] Several materials such as metals and ferrites can be applied to improve the structure and microwave absorption of GO. Previous studies have also shown that by the combination of GO with magnetic metallic nanoparticle ma-terials, its relative permittivity and permeability can achieve the maximum absorption of microwave in a wide frequency range.…”