Abstract
Novel films consisting of multi-walled carbon nanotubes (MWCNTs) were fabricated by means of chemical vapor deposition with decomposition of either acetonitrile (ACN) or benzene (BZ) using ferrocene as catalyst. The electrochemical responses of MWCNT-based films towards the ferrocyanide/ferricyanide, [Fe(CN)6]3−/4− redox couple were probed by means of cyclic voltammetry and electrochemical impedance spectroscopy at 25.0 ± 0.5 °C. Both MWCNT-based films exhibit Nernstian response towards [Fe(CN)6]3−/4− with some slight kinetic differences. Namely, heterogeneous electron transfer rate constants lying in ranges of 2.69 × 10−2–1.7 × 10−3 and 9.0 × 10−3–2.6 × 10−3 cm·s−1 were obtained at v = 0.05 V·s−1 for MWCNTACN and MWCNTBZ, respectively. The detection limit of MWCNTACN, estimated to be about 4.70 × 10−7 mol·L−1 at v = 0.05 V·s−1, tends to become slightly poorer with the increase of the scan rate, namely at v = 0.10 V·s−1 the detection limit of 1.70 × 10−6 mol·L−1 was determined. Slightly poorer response ability was exhibited by MWCNTBZ; specifically the detection limits of 1.57 × 10−6 and 4.35 × 10−6 mol·L−1 were determined at v = 0.05 and v = 0.10 V·s−1, respectively. The sensitivities of MWCNTACN and MWCNTBZ towards [Fe(CN)6]3−/4− were determined as 1.60 × 10−7 and 1.51 × 10−7 A·L·mol−1·cm−2, respectively. The excellent electrochemical performance of MWCNTACN is attributed to the presence of incorporated nitrogen in the nanotube’s structure.
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Acknowledgments
The authors would like to thank Mrs. D. Schneider (TU Ilmenau) for the help for the production of the MWCNT-based electrodes.
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Tsierkezos, N.G., Ritter, U. Electrochemical Responses and Sensitivities of Films Based on Multi-Walled Carbon Nanotubes in Aqueous Solutions. J Solution Chem 41, 2047–2057 (2012). https://doi.org/10.1007/s10953-012-9925-1
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DOI: https://doi.org/10.1007/s10953-012-9925-1