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.

Graeme Williams, Brian Seger, Prashant Kamat (2008)

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.