In this study, a simple one-step method was developed to load small-sized Pt nanoparticles (3.1 ± 0.3 nm) in large quantities (50 wt %) on aniline-functionalized and reduced graphene oxide (r-fGO). In the process, an ethylene glycol solution and aniline-functionalized moiety play the roles of reducing agent and stabilizer for the Pt nanoparticles, respectively, without damaging the graphite structures of the r-fGO. The Pt nanoparticles loading on the surface of r-fGO with uniform dispersion have a great effect on the electrical conductivity.
A simple method was used to synthesize the polyaniline nanofiber-coated polystyrene/graphene oxide (PANI-PS/GO) core shell composite using a solution mixing process. GO could be easily coated on PANI-coated PS to form a PANI-PS/GO core shell structure through the ring-opening reaction of the epoxide groups in the GO sheets with amine groups in the PANI nanofibers. The existence of PANI in the PS and PS/GO core shell composite was confirmed by the appearance of a new peak in the photoelectron spectroscopy and energy-dispersive X-ray spectroscopy results assigned to the nitrogen band. Thermal investigation showed that the addition of GO to the PANI-coated PS increased the glass transition temperature of the PANI-PS/GO composites. The thermal stability of the composites was also improved compared to that of neat PS. Electrical conductivity investigation using a four-probe resistivity measurement system showed that PANI addition to the composite not only enhanced the interfacial interaction but also improved the electrical conductivity of the composite. The increased electrical conductivity of the final composite may enable potential electronic applications.
We demonstrate a simple method to prepare alkylated graphene/polyaniline composites (a-GR/PANI) using solution mixing of exfoliated alkyl Iodododecane treated graphene oxide sheets with polyaniline nanofiber; polyaniline nanofibers (PANI) prepared by using rapid mixing polymerization significantly improve the processibility of polyaniline and its performance in many conventional applications. Also, polyaniline nanofibers exhibit excellent water dispersibility due to their uniform nanofiber morphology. Morphological study using SEM and TEM analysis showed that the fibrous PANI in the composites a-GR/PANI mainly adsorbed onto the surface or intercalated between the graphene sheets, due especially to the good interfacial interaction between the alkylated gaphene and the polyaniline nanofibers. The existence of polyaniline nanofibers on the surface of the garphene and the alkylated graphene sheets was confirmed by using FT-IR, FT-Raman and X-ray diffraction analysis. Due to the good interfacial interaction between the alkylated graphene and the polyanilines nanofibers, the composite (a-GR/PANI) exhibited excellent dispersion stability in DMF compared to the same composite (GR/PANI) without alkylation. The electrical conductivity of the (GR/PANI) composite was 9% higher than that of pure PANI and the same weight percent for the composite after alkylation was 13% higher than that of pure PANI nanofibers.
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