Three-dimensional reduced graphene oxide powder for efficient microwave absorption in the S-band (2–4 GHz)

Abstract

Three-dimensional reduced graphene oxide (3D-rGO) powders are synthesized and demonstrate remarkably enhanced microwave absorption in the S-band (2–4 GHz).

Fe3O4 nanoparticles decorated on a CuS platelet-based sphere: a popcorn chicken-like heterostructure as an ideal material against electromagnetic pollution

“…A variety of studies have been devoted to the synthesis of EA materials to obtain EA materials having properties such as strong absorption capability, wide effective absorption bandwidth, high thermal stability, lightweightedness, and anti-oxidation. [6][7][8] With the development of technology, various strategies have been explored to synthesize functional materials to achieve better EA performance; these materials include metal oxides or suldes, such as ZnO, 9 CoFe 2 O 4 , 10 SnO 2 , 11 CoS, 12 and CuS 13-15 as well as carbon materials such as carbon nanotubes (CNTs), 16,17 graphene or reduced graphene oxide (RGO), 18 carbon bers (CFs), 19 and/or their hybrids. 20,21 Among the many existing materials, heterostructures of magnetic loss-type and dielectric loss-type materials produce great enhancement in EA performance; these materials include Fe 3 32 graphene CuS, 33 and CuS/ ZnS.…”

Realizing high-performance Zn-ion batteries by a reduced graphene oxide block layer at room and low temperatures

“…The down-shift of Gband of rGO films results from the recovery of hexagonal network of carbon atoms with defects [21] . The increase of the I D / I G intensity ratio from 0.83 of GO to 1.02 of 10 0 0rGO suggests the decrease of the average size of sp 2 domains upon the removal of most oxygenated functional groups [22,23] . Before utilizing as a block layer, the electrolyte wettability was evaluated by measuring the contact angles of the same amount of electrolyte applied on GO and rGO films ( Fig.…”

Laser Patterning a Graphene Layer on a Ceramic Substrate for Sensor Applications

“…Raman spectra obtained near the edges of the cutting line when graphene was removed from gold are characteristic for graphene oxide and reduced graphene oxide. The characteristic values of the ID/IG band intensity ratios were observed [65][66][67]. The same laser treatment parameters were used for the ablation of graphene on Au and Al 2 O 3 , but the width of the path was different (as mentioned above).…”