A self-assembled spongy-like (S) ultralight (ρ ≈ 140 mg cm −3 ) aerogel was fabricated through polypyrrole (PPy) and reduced graphene oxide (RGO). Firstly, the dispersed graphene oxide (GO) were locked homogeneously in those chains formed by the gelation of PPy. Then a hydrothermal process was employed to reduce GO to RGO. With a trace content of RGO (0.43 wt% in aerogel), the electromagnetic absorption (EA) performance had been significant improved. Only with a very low filler loading (10 wt%), the S-PPy/RGO aerogel based composite could reach an effective EA bandwidth (below − 10 dB) of 6.76 GHz, and the highest reflection coefficient reached − 54.4 dB at 12.76 GHz. It was demonstrated that this aerogel material can be considered as an effective route to design a light weight and high performance EA material. Furthermore, the 3D-PPy/RGO aerogel also showed a suitable pollution treatment performance with different solvents and dyes. materials, such as intercalated graphite, 14 carbon nanotubes (CNTs), 15,16 porous carbon, 17,18 carbon nanopowders, 19 carbon fibers, 20 graphene, 21 and reduced graphene oxide (RGO). 22 Benefit from the nano-structure, these above mentioned materials can reach an ideal EA performance with a fitting filler loading ratio in composites. However, metal oxide or sulfide based EA composites can't overcome high filler loading ratio, even reach 70.0 wt%; 5 pure carbon materials based EA composites can't get a sufficient broad effective EA bandwidth (below − 10 dB) with low matching thickness, though they give low loading ratio in composites (less than 20.0 wt%).Taking RGO for instance, it is a kind of two dimensional (2D) carbon material that can be synthesized from graphene oxide (GO) using chemical, 23 thermal, 24 optical, 25,26 and hydrothermal 27 methods. Dielectric loss and the low density of RGO enable it to be used as EA material. With a suitable preparation process, pure RGO based composite can display an effective EA bandwidth of 4.32 GHz with a thickness of 4 mm. 22 The development of functional RGO modified with other nanoparticles also represents an important advance to improve EA performance both in width and intensity, meanwhile reduce the thickness of the composites, such as Fe Furthermore, core-shell structures, for example, Fe 3 O 4 @ZnO, 44 SiO 2 @Fe 3 O 4 , 45 and Fe 3 O 4 @Fe, 46 can also improve the EA performance of RGO.Besides the above mentioned EA materials, recently, the intrinsically conducting polymers (ICPs) with low densities, such as PEDOT, PANi and polypyrrole (PPy), are also great interest as EA materials and EA performance are closely related to the structure. 46 However, composite only loaded with single ICP is not enough to produce sufficient electric loss, which limits its application in broadband absorber. Although the EA performance can be improved through hybridizing other semiconductors or RGO is only trace content (0.43 wt%) in aerogel to match the impedance with air, which makes this aerogel cheap enough for large-scaled use. Furthermore, the S-PP...

Electromagnetic wave absorbing materials that can exhibit effective absorption in a broad bandwidth at a thin thickness are strongly desired due to their widespread applications in electronic devices. In this study, hybrids of MoS2 and reduced graphene oxide (RGO) were prepared and their microwave absorption performance was investigated for the first time. It was found that a thin sample consisting of 10 wt % MoS2/RGO hybrid in the wax matrix exhibited an effective microwave absorption bandwidth of 5.72 GHz at the thickness less than 2.0 mm. The highest reflection loss of -50.9 dB was observed at 11.68 GHz for a sample with a thickness of 2.3 mm. Results obtained in this study indicate that hybrids of MoS2 and RGO are promising microwave absorbing materials, which can exhibit broad effective absorption bandwidth at low filler loading and thin thickness.

Based on the good characteristics of graphene, many physiological signals can be detected by graphene sensors covering the human body. Graphene wearable sensors have great potential in healthcare and telemedicine.

A kind of pollution known as electromagnetic interference (EMI), which results from ubiquitous usage of various electronic communication and military radar equipment, has been receiving increasing attention recently. However, large-area EMI shielding on transparent and/or curved surfaces, including building windows, curved glass wall, and special requirements spaces (SRSs), remains hard to achieve. In this paper, a silver nanofiber (AgNF) based flexible and transparent EMI shielding film was successfully assembled via a room-temperature roll-to-roll production method. For transparent application scenario, AgNF with 89% transmittance in visible range and 1 μm thickness shows~20 dB shielding efficiency (EMI SE). On the other hand, total shielding (>50 dB) is obtained when the thickness of AgNF increases to 10 μm, while its transmittance in visible range remains higher than 75%. Considering the facile and scale-free production technology, this material can be readily applied in large-scale, transparent, and/or SRSs EMI shielding.