Solvent-assisted thermal reduction of microcrystalline graphene oxide with excellent microwave absorption performance

Abstract

aTo prepare a new kind of electromagnetic wave absorber, and improve the processing technology and accessional value of natural microcrystalline graphite minerals (NMGMs), reduced microcrystalline graphene oxide (rGO-M), a novel absorber with high absorption, low reflection and a wide absorption band, was prepared from NMGMs using a solvent-assisted thermal reduction method. Moreover, the asproduced rGO-M with adjustable electrical resistivity can be easily transferred into well distributed bulk materials by freeze-drying technology. These unique structures and compositions make a great contribution to the impedance match, and cause strong conductive loss and various dipole polarization effects which greatly enhance the absorption. Meanwhile, the effective bandwidths below À5 dB and À10 dB are 11.7 GHz and 3.32 GHz respectively, and the reflection loss can reach À42.68 dB. The study will be beneficial to the development of carbon resources and carbon materials research. Besides, it can provide a scientific basis for the further improvement of the comprehensive utilization and the level of deep processing technology of NMGM resources.

Synergistically Toughening Polyoxymethylene by Methyl Methacrylate–Butadiene–Styrene Copolymer and Thermoplastic Polyurethane

“…These “super‐tough” polyoxymethylene blends can be applied as the host matrix for nanocomposites . This method not only reduces the cost but also makes the POM blends more attractive to industries for different applications like EMI shielding, strain sensing …”

Enhanced microwave absorption properties of reduced graphene oxide/TiO2 nanowire composites synthesized via simultaneous carbonation and hydrogenation

“…RGO/h-TiO 2nw composites synthesized in this study, outperform all other reported materials with outstanding RL values and ultralow filler contents in the paraffin matrix, and are accompanied by a broad EAB. 9,18,24,28,31,38,43,46,[51][52][53][54][55] Based on the aforementioned analysis, the associated mechanisms for the improved MA performance of RGO/h-TiO 2nw composites could be concluded and are illustrated in Fig. 10.…”

Graphene‐Based Materials toward Microwave and Terahertz Absorbing Stealth Technologies

“…Similarly, Kang and co‐workers prepared a 3D honeycomb‐like RGO powdered absorber with enhanced absorption of the S band . Xie and co‐workers demonstrated an ethanol‐assisted thermal reduction strategy to prepare microcrystalline GO, which exhibited an excellent absorption performance because of its conjugated graphene network and amorphous nanostructure. It should be noted that the electrical conductivity and complex permittivity of microcrystalline GO can be adjusted over a wide range by changing the concentration of ethanol.…”