Showing papers by "Cristina Vallés published in 2011"
TL;DR: In this article, the donor-acceptor interaction at the interface between RGO sheets and the thin PANI layer coating was investigated and a conceptual explanation was proposed in which RGO plays a dual role as electron acceptor and as large counterion stabilizing an atypical intermediate oxidation state of PANI.
Abstract: We report the formation of a solid-state charge-transfer complex upon simultaneous reduction of a graphene oxide–polyaniline (GO-PANI) composite consisting of GO sheets coated by a thin layer of PANI. The reduced R(GO-PANI) material exhibits an unprecedented donor–acceptor interaction at the interface between RGO sheets and the thin PANI layer coating. A conceptual explanation is proposed in which RGO plays a dual role as electron acceptor and as large counterion stabilizing an atypical intermediate oxidation state of PANI. Moreover, the donor–acceptor interactions are responsible for superior materials characteristics, such as excellent water dispersibility, high environmental (chemical and thermal) degradation stability, and enhanced electric conductivity as high as 2600 S/m. These results may enable further opportunities for the development of novel electroactive materials based on graphene and intrinsically conducting polymers and the fabrication of corresponding flexible electronic devices through tr...
106 citations
TL;DR: In this paper, a CVD multi-walled carbon nanotubes are shown to form true solutions by reduction with alkali metals and subsequent exposure to polar solvents such as DMSO.
26 citations
01 Jan 2011
TL;DR: In this paper, a general introduction to the field of graphene and in particular of graphene-based composites is presented and the opportunities for achieving novel high performance composite materials with enhanced properties are highlighted and the challenges to be overcome discussed.
Abstract: In this article we present a general introduction to the field of graphene and in particular of graphene-based composites. The opportunities for achieving novel high performance composite materials with enhanced properties are highlighted and the challenges to be overcome discussed. As the application of graphene as a nanofiller in composite materials is imminent, the availability of processable graphene sheets in large quantities seems essential to the success of exploiting composite and other applications of graphene. In addition, our work on the synthesis of electroactive graphene-polyaniline composites is presented.
5 citations