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Item type:Publication, Access status: without files , Synthesis of an organic conductive porous material using starch aerogels as template for chronic invasive electrodesWe report the development of an organic conducting mesoporous material, as coat for invasive electrodes, by a novel methodology based on the use of starch aerogel as template. The poly(3,4-ethylenedioxythiophene) (PEDOT) aerogel was synthesized by polymerization of 3,4-ethylenedioxythiophene within a saturated starch aerogel with iron (III) p-toluenesulfonate (oxidizing agent) and subsequent removal of the polysaccharide template, followed by supercritical CO2 drying. The chemical structure and oxidation state of the resulting material were studied by Raman spectroscopy. The morphology and surface properties of the obtained nanoporous material were investigated by scanning electron microscopy (SEM), micro computed tomography (μCT) and nitrogen adsorption-desorption techniques. The composition and thermal behaviour were evaluated by energy dispersive spectroscopy (EDS) and thermogravimetric analysis (TGA) respectively. A preliminary biocompatibility test verified the non-cytotoxic effects of the PEDOT aerogel. The large surface area and wide pore size distribution of the PEDOT conductive aerogel, along with its electrical properties, enable it to be used as extracellular matrix scaffold for biomedical applications.Publicationtype: Journal ArticleScopus© Citations 41 15 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , In vitro biocompatibility study and electrical properties of the PEDOT, PEDOT collagen coat, PEDOT nanotubes and PEDOT aerogels for neural electrodesThe aim of this study is to evaluate the cytotoxicity of Poly(3, 4-ethylenedioxythiophene) (PEDOT), PEDOT-collagen and PEDOT nanostructured coatings for neural electrodes. Incorporation of cell growth factors and the structuration of supporting material are two strategies to improve cell adhesion and biocompatibility in order to produce better and more specific neural implants. PEDOT coat, PEDOT-collagen coat, PEDOT nanotubes and PEDOT aerogel were tested for biocompability using the standard ISO 10993-5. PEDOT and PEDOT-Collagen coats were deposited via galvanostatic electropolymerization from a NaPSS micellar dispersion. In addition PEDOT nanotubes were obtained by hard polycarbonate template and PEDOT aerogels were chemically produced through a soft starch template. PEDOT samples were studied for biocompatibility, characterized by LCRmeter and Scanning electron microscopy (SEM). Biocompatibility test verified the absence of cytotoxic effects in all the PEDOT samples.Publicationtype: Journal Article105 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Effect of experimental factors on the properties of PEDOT-NaPSS galvanostatically deposited from an aqueous micellar media for invasive electrodes(IEEE, 2012-12); ; ; Poly(3,4-ethylenedioxythiophene) (PEDOT) coat for invasive electrodes has been generated considerable interest in terms of electrical properties and biocompatibility. Adequate formulations and methodology are necessary to deposit polymer reproducibly on macro and micro-electrodes. Electrochemical properties of PEDOT as interface material were assessed with respect to different experimental factors. PEDOT/NaPSS was polymerized from a sodium polystyrenesulfonate (NaPSS) dispersion. The dispersion was characterized by cyclic voltammetry and its critical micellar concentration (CMC) value is reported, according to our best knowledge, for the first time for PEDOT deposition. The polymer obtained was studied using Raman spectroscopy, impedance and cyclic voltammetry measurement. PEDOT-NaPSS coat shows high charge injection (Qinj), low interfacial impedance (Z) and superficial chemical stability (Raman). This study provides a simple, constant and reproducible framework to coat invasive electrodes.Publicationtype: Conference Paper10