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      Reduced graphene oxide (RGO) modified spongelike polypyrrole (PPy) aerogel for excellent electromagnetic absorption

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          Abstract

          A self-assembled spongelike (S) ultralight ( ρ ≈ 140 mg cm −3) aerogel was fabricated through polypyrrole (PPy) and reduced graphene oxide (RGO).

          A self-assembled spongelike (S) ultralight ( ρ ≈ 140 mg cm −3) aerogel was fabricated through polypyrrole (PPy) and reduced graphene oxide (RGO). First, the dispersed graphene oxide (GO) was 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 significantly 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 lightweight and high performance EA material. Furthermore, the S-PPy/RGO aerogel also showed a suitable pollution treatment performance with different solvents and dyes.

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          TiO2-graphene nanocomposites. UV-assisted photocatalytic reduction of graphene oxide.

          Graphene oxide suspended in ethanol undergoes reduction as it accepts electrons from UV-irradiated TiO(2) suspensions. The reduction is accompanied by changes in the absorption of the graphene oxide, as the color of the suspension shifts from brown to black. The direct interaction between TiO(2) particles and graphene sheets hinders the collapse of exfoliated sheets of graphene. Solid films cast on a borosilicate glass gap separated by gold-sputtered terminations show an order of magnitude decrease in lateral resistance following reduction with the TiO(2) photocatalyst. The photocatalytic methodology not only provides an on-demand UV-assisted reduction technique but also opens up new ways to obtain photoactive graphene-semiconductor composites.
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            Electromagnetic interference shielding effectiveness of carbon materials

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              Hierarchical Dendrite-Like Magnetic Materials of Fe3O4, γ-Fe2O3, and Fe with High Performance of Microwave Absorption

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                Author and article information

                Journal
                JMCAET
                Journal of Materials Chemistry A
                J. Mater. Chem. A
                Royal Society of Chemistry (RSC)
                2050-7488
                2050-7496
                2015
                2015
                : 3
                : 27
                : 14358-14369
                Article
                10.1039/C5TA01577D
                a204ebb3-0f4d-4cde-9f2f-a8dd84070eb4
                © 2015
                History

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