Graphene and ionic liquids new gel paste electrodes for caffeic acid quantification

• DOI: 10.1016/j.snb.2015.02.033
• Publication Date: 2015-02-18T17:20:48Z
• Authors: Federica Valentini; Davide Roscioli; Marilena Carbone; Valeria Conte; Barbara Floris; E.M. Bauer; Nicoletta Ditaranto; Luigia Sabbatini; E. Caponetti; D. Chillura-Martino
• Keywords: Caffeic acid; nanocomposite; Graphenes; Anti-oxidant agents; Ionic liquids; Nanocomposite; Caffeic acid; Electrochemistry; Anti-oxidant agents; Anti-oxidant agent; Ionic liquid; 01 natural sciences; Settore CHIM/03 - CHIMICA GENERALE E INORGANICA; Ionic liquids; Nanocomposites; 0104 chemical sciences; graphene Ionic liquid; electrochemistry; graphene Ionic liquids; nanocomposites; electrochemistry; caffeic acid; anti-oxidant agents; Electrochemistry; Graphene; caffeic acid; anti-oxidant agents

Graphene/ionic liquids nanocomposite gels were synthesized by an electrochemical etching approachand fully characterized under a morphological and structural point of view. For this purpose,several analytical techniques were applied, as HR-TEM/EDX (High Resolution-Transmission Elec-tron Microscopy/Energy Dispersive X-Ray Analysis); FE-SEM/EDX (Field Emission-Scanning ElectronMicroscopy/Energy Dispersive X-Ray Analysis); XPS (X-Ray Photoelectron Spectroscopy); FT-IR (FourierTransform-Infrared Spectroscopy) and electrochemical techniques. After the characterization study,nanocomposite-gel paste electrodes were assembled, exhibiting a selective and specific detectiontoward the caffeic acid oxidation. Better performances in terms of linear range of concentration (from0.025 to 2.00 M), reproducibility (intra-; 1.40% and inter-electrode reproducibility-3.20%), sensitivity(3389/A mM-1cm-2), fast response time (2 s) and detection limit (0.005 mM) were obtained, in compar-ison with other chemically modified electrodes, described in literature for the caffeic acid detection. Thisnanocoposite-gel could represent a new prototype of miniaturized nanostructured sensors useful for the"in situ" quantification of an important molecule, having pharmacological properties, anti-inflammatory,antibacterial, antiviral, immunomodulatory and antioxidant effects.