Dispersible composites of exfoliated graphite and polyaniline with improved electrochemical behaviour for solid-state chemical sensor applications

Zhanna Boeva, Konstantin A. Milakin, Markus Pesonen, Aleksander N. Ozerin, Vladimir G. Sergeyev, Tom Lindfors

    Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

    23 Citeringar (Scopus)


    We report here the in situ polymerization of aniline in the presence of exfoliated graphite of two different grades (graphene and graphite) resulting in composite materials which are readily dispersible in N-methylpyrrolidone. Compared to polyaniline (PANI) prepared without graphene/graphite which becomes electrically non-conducting at pH > 3, the PANI-graphene/graphite composites showed significantly improved pH stability and electrochemical behaviour in aqueous electrolyte solutions at pH <= 8, without any further need of surface functionalization of the graphene/graphite flakes to stabilize the conducting form of polyaniline (PANI). The improved electroactivity is ascribed to the synergistic effect of graphene/graphite and PANI, and the network formation of the electrically conducting exfoliated graphites in the PANI matrix, which was electrochemically confirmed by simple cyclic voltammetric measurements at pH = 9.5 in the presence of the Ru(NH3)(6)(2+/3+) and Fe(CN)(6)(3-/4-) redox couples. Due to the dispersibility of the composites, thin films possessing stability in water can easily be prepared by solution casting for different types of solid-state chemical sensor and ion-selective electrode applications operating at neutral pH. By using sodium ascorbate as a model substance, we show that its amperometric detection at pH = 7.3 with the PANI-graphite films results in a current amplification of 1.3-10.2 times in the concentration range of 10(-4)-10(-2) M, compared to conventional PANI, which clearly demonstrates the advantage of incorporating exfoliated graphites in the PANI films. The materials reported in this paper were systematically characterized with cyclic voltammetry, FTIR, Raman and X-ray photoelectron spectroscopy, scanning electron microscopy, X-ray diffraction and electrical conductivity measurements.
    Sidor (från-till)46340–46350
    Antal sidor11
    TidskriftRSC Advances
    StatusPublicerad - 2014
    MoE-publikationstypA1 Tidskriftsartikel-refererad
    • Konstantin Milakin

      Tom Lindfors (Värd)

      15 sep. 201315 dec. 2013

      Aktivitet: Stå värd för en besökareVärd för en akademisk besökare

    • Zhanna A. Boeva

      Tom Lindfors (Värd)

      1 aug. 20138 nov. 2013

      Aktivitet: Stå värd för en besökareVärd för en akademisk besökare

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