Development of novel catalytically active polymer-metal-nanocomposites based on activated foams and textile fibers

Nanoscale Research Letters (Impact Factor: 2.78). 05/2013; 8(1):238. DOI: 10.1186/1556-276X-8-238
Source: PubMed


In this paper, we report the intermatrix synthesis of Ag nanoparticles in different polymeric matrices such as polyurethane foams and polyacrylonitrile or polyamide fibers. To apply this technique, the polymer must bear functional groups able to bind and retain the nanoparticle ion precursors while ions should diffuse through the matrix. Taking into account the nature of some of the chosen matrices, it was essential to try to activate the support material to obtain an acceptable value of ion exchange capacity. To evaluate the catalytic activity of the developed nanocomposites, a model catalytic reaction was carried out in batch experiments: the reduction of p-nitrophenol by sodium borohydride.

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Available from: Berta Domènech
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    ABSTRACT: We report an electrochemically prepared 3-mercaptopropionic acid (MPA) capped Pt nanoparticles-Polypyrrole (PPy) nanocomposite film based bioelectrode for the detection of human C-reactive protein (alpha CRP). The electrochemical deposition provides homogeneous distribution of ultrafine Pt(MPA)-NPs within the uniform and adherent PPy film with high degree of geometrical conformity and controllable film thickness. Protein antibody, Ab-alpha CRP, was covalently immobilized through the site specific carboxyl groups of Pt(MPA)-NPs within the polymer nanocomposite film by carbodiimide coupling reaction. The bioelectrode interfacial surface electron transport study towards protein antigen, Ag-alpha CRP, was carried out by electrochemical impedance spectroscopy (EIS). The value of 'n', a Constant Phase Element exponent used as a gauge of the heterogeneity, for Pt(MPA)-PPy nanocomposite film was found to be 0.88 similar to 1 which is indicative of a homogeneous morphology of the composite film with minimal defects. The EIS of the bioelectrode exhibited significant changes in charge transfer resistance (R-et) component at a low ac frequency of <20 Hz towards Ag-alpha CRP detection over a linear range of 10 ng mL(-1)-10 mu g mL(-1) in PBS with a sensitivity of 109.74 Omega cm(2) per decade.
    Full-text · Article · Aug 2014 · Polymer