Water‐soluble graphene oxides grafted by polyanilines

Abstract

The treatment of graphene oxide having 4-aminophenyl groups (GO-AP) with (NH 4) 2 S 2 O 8 yielded an ammonium radical cation (GO-AP .+). The radical polymerization of N-(4-sulfopropyl)aniline (ANPrSO 3 H) and copolymerization of ANPrSO 3 H with aniline (AN) in the presence of GO-AP .+ yielded watersoluble GO composites that were grafted with poly(N-(4-sulfopropyl)aniline) and poly(N-(4-sulfopropyl)aniline-co-aniline), namely, GO-AP-PANPrSO 3 H and GO-AP-PAN/PANPrSO 3 H, respectively. The formation of the composites consisted of GO, PAN, and PANPrSO 3 H chains that were bonded to the amino group of GO-AP, confirmed by Raman spectroscopy, differential scanning calorimetry, and scanning electron microscopy analyses. The UV-vis measurements suggested that the polymer chains of the composites were self-doped by the sulfonic acid group and de-doped by sodium sulfonation. The composites exhibited photoluminescence resulting from the polymer chain and GO depending on the excitation wavelength. They underwent electrochemical oxidation of the polymer backbone and reduction of the carbonyl groups.

Barrier and Biodegradable Properties of Poly(butylene adipate-co-terephthalate) Reinforced with ZnO-Decorated Graphene Rendering it Antibacterial

“…The thickness of a single-layer graphene is 0.35 nm, which is the thinnest two-dimensional material discovered by researchers in the world. − Graphene has many excellent properties, such as electrical, optical, and mechanical properties, but graphene itself has a high surface stability and exhibits strong inertness. Therefore, in the dispersion process, graphene is prone to agglomeration, and this leads to the reduction of its specific surface area . Hence, it is a common solution to modify graphene.…”