Oxidized graphene in ionic liquids for assembling chemically modified electrodes: a structural and electrochemical characterization study

Eugenio Caponetti, Giorgio Nasillo, Davide Roscioli, Conte, Flammini, Barbara Floris, Palleschi, Marilena Carbone, Bauer, Valentini

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

Dispersions of graphene oxide (GO) nanoribbons in ionic liquids, ILs (either 1-butyl-3-methylimidazolium chloride (BMIM-Cl-) or 1-butylpyridinium chloride (-Bupy-Cl-)) have been used to assemble modified screen printed electrodes (SPEs). The graphene oxide/ionic liquid dispersions have been morphologically and structurally characterized by the use of several techniques: X-ray photoelectron spectroscopy (XPS), Fourier transform-infrared (FT-IR) spectroscopy, high-resolution-transmission electron microscopy (HR-TEM). The assembled modified SPEs have then been challenged with various compounds and compared to several electro-active targets. In all cases high peak currents were detected, as well as significant potential shifts, especially in the detection of catecholamines and NADH, compared with the bare SPE and the conventional electrodes, such as glassy carbon (GC) and highly oriented pyrolitic graphite (HOPG). This opens the way to the assembly of new types of sensors and biosensors. The enhanced performances observed are attributed to electrocatalytic effects related to the high electrode surface area, to oxygen-assisted electron transfer, as well as to the disordering effect of the ILs, this latter related to the favorable π–π interactions with the ILs and the GO plane.
Original languageEnglish
Pages (from-to)5823-5831
Number of pages9
JournalAnalytical Chemistry
Volume84
Publication statusPublished - 2012

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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