Preparation and characterization of nanocomposite based on polyaniline and graphene nanosheets

Department of Chemistry, Hanyang University, 133-791, Seoul, Korea; Division of Advanced Materials Science Engineering, Hanyang University, 133-791, Seoul, Korea; Institute of Chemistry, Vietnam Academy of Science and Technology (VAST), Caugiay, Hanoi, Vietnam; Department of Environmental Health, Seonam University, 590-711, Namwon, Korea
Macromolecular Research (Impact Factor: 1.64). 07/2011; 19:203-208. DOI: 10.1007/s13233-011-0216-2

ABSTRACT Polymer nanocomposites based on polyaniline (PANi) and graphene nanosheets (GNS) modified with poly(sodium 4-styrensulfonate) (PSS-GNS) were prepared, and their structure and properties were investigated by atomic force microscopy (AFM), scanning electron microscopy (SEM), UV-vis spectroscopy, ATR-IR spectros-copy, X-ray diffraction, elemental analysis, thermogravimetric analysis (TGA) and electrical conductivity measure-ments. The results revealed that for the PANi/PSS-GNS nanocomposites, the disordered structure of PSS-GNS was fully destroyed and PSS-GNS exists in the form of a single GNS or stacked PSS-GNS elements in a PANi matrix. PSS-GNS was partly covered by PANi due to hydrogen bonding that occurs between the PSS-GNS and PANi. By incorporating PSS-GNS, the electrical conductivity of PANi increased linearly from 0.84 S/cm for neat PANi to 4.96 S/cm for a PANi/PSS-GNS (5%) nanocomposite. The thermal stability of the PANi was also improved significantly to approximately 100 o C by the nanocomposite.

  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Nanocomposites including graphene oxide (GO) and conducting polymers (PPy, PANI and PEDOT) were prepared via an in-situ chemical polymerization process, and their characteristic properties depending upon the change of conducting polymer (CP) content were analyzed. A confirmation was made on not only the functional groups formed in GO but also the presence of CP existent in the nanocomposites. The molecular interaction between GO and poly(4-styrene sulfonic acid) (PSSA) or CP in the nanocomposites was proposed. With the increase of PEDOT content in the GOPSS/PEDOT nanocomposite, the estimated value of regarding the Raman analysis of them was decreased and a major change of their Raman spectra characteristic peaks was observed. In the GO-PSS/PEDOT nanocomposite, PEDOT molecules made an exfoliation of GO-PSSA layers and thus they were intercalated among layers. Such a unique molecular morphology induced the highest electrical conductivity for the GO-PSS/PEDOT nanocomposite among three kinds of nanocomposites prepared in this study. It is also noted that the uniform morphology confirmed in this study helped a thermal stability improvement in the nanocomposite due to the presence of GO or GO-PSSA acting as a thermal barrier.
    Polymer Korea 01/2014; 38(2). · 0.48 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Graphene oxide/copolyaniline (GO/NCOPA) composites were prepared with GO, which was prepared using a modified Hummers method and a monomer mixture containing aniline and ionic sodium diphenylamine sulfonate, where ionic N-substituted copolyaniline was synthesized by chemical oxidation. The GO/NCOPA composite, as a dry-base electrorheological (ER) fluid system, was dispersed in silicone oil. With the ionic substituent on the polymer chain, the composite showed both controllable electrical conductivity and higher polarization, which provide favorable factors for ER applications. The GO/NCOPA composite-based ER fluid containing a copolymer with an ionic group exhibited typical ER characteristics, as measured using a rotational rheometer equipped with a Couette-type cylinder and a high voltage generator. The dielectric spectra measure was correlated further with their ER performance.
    Colloid and Polymer Science 291(6). · 2.16 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In order to bring graphene materials much closer to real world applications, it is imperative to have simple, efficient and eco-friendly ways to produce processable graphene derivatives. In this study, a hydrophilic low-temperature thermally functionalized graphene and its super-hydrophobic organically modified graphene derivative were fabricated. A unique structural topology was found and some of the oxygen functionalities were retained on the thermally functionalized graphene surfaces, which facilitated the subsequent highly effective organic modification reaction and led to the super-hydrophobic organically modified graphene with multifunctional applications in liquid marbles and polymer nanocomposites. The organic modification reaction also restored the graphenic conjugated structure of the thermally functionalized graphene, particularly for organic modifiers having longer alkyl chains, as confirmed by various characterization techniques such as electrical conductivity measurements, ultraviolet/visible spectroscopy and selected area electron diffraction. The free-standing soft liquid marble was fabricated by wrapping a water droplet with the super-hydrophobic organically modified graphene, and showed potential for use as a microreactor. As for the polymer nanocomposites, a strong interfacial adhesion is believed to exist between an organic polymer matrix and the modified graphene because of the organophilic coating formed on the graphene base, which resulted in large improvements in the thermal and mechanical properties of the polymer nanocomposites with the modified graphene, even at very low loading levels. A new avenue has therefore been opened up for large-scale production of processable graphene derivatives with various practicable applications.
    Nano Research 03/2014; 7(3):418-433. · 7.39 Impact Factor

Full-text (3 Sources)

Available from
Aug 17, 2014