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

SENSORS AND ACTUATORS B-CHEMICAL

卷:212

Article

Valentini, Federica¹  Roscioli, Davide¹  Carbone, Marilena¹  Conte, Valeria¹  Floris, Barbara¹  Bauer, E. M.²  Ditaranto, Nicoletta³  Sabbatini, Luigia³  Caponetti, E.^4,5  Chillura-Martino, D.⁴ 

[1] Dipartimento Sci & Tecnol Chim, Via Ric Sci 1, I-00133 Rome, Italy

[2] ISM CNR, I-00015 Monterotondo, Italy

[3] Univ Bari Aldo Moro, Dipartimento Chim, I-70125 Bari, Italy

[4] Univ Palermo, Ctr Grandi Apparecchiature, I-90128 Palermo, Italy

[5] Univ Palermo, Dept Phys Chem, I-90128 Palermo, Italy

关键词: Graphene;    Ionic liquids;    Nanocomposites;    Electrochemistry;    Caffeic acid;    Anti oxidant agents;   

DOI  :  10.1016/j.snb.2015.02.033

来源: Elsevier

【 摘 要 】

Graphene/ionic liquids nanocomposite gels were synthesized by an electrochemical etching approach and 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 Electron Microscopy/Energy Dispersive X-Ray Analysis); FE-SEM/EDX (Field Emission-Scanning Electron Microscopy/Energy Dispersive X-Ray Analysis); XPS (X-Ray Photoelectron Spectroscopy); FT-IR (Fourier Transform-Infrared Spectroscopy) and electrochemical techniques. After the characterization study, nanocomposite-gel paste electrodes were assembled, exhibiting a selective and specific detection toward the caffeic acid oxidation. Better performances in terms of linear range of concentration (from 0.025 to 2.00 M), reproducibility (intra-; 1.40% and inter-electrode reproducibility-3.20%), sensitivity (3389/mu A mM(-1) cm(-2)), fast response time (2 s) and detection limit (0.005 mM) were obtained, in comparison with other chemically modified electrodes, described in literature for the caffeic acid detection. This nanocoposite-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. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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