Comparison of two different carbon nanotube-based surfaces with respect to potassium ferricyanide electrochemistry

SURFACE SCIENCE

卷:606

Article

Taurino, Irene^1,2  Carrara, Sandro¹  Giorcelli, Mauro²  Tagliaferro, Alberto²  De Micheli, Giovanni¹ 

[1] Ecole Polytech Fed Lausanne, Integrated Syst Lab, CH-1015 Lausanne, Switzerland

[2] Politecn Torino, Dept Phys, I-10129 Turin, Italy

关键词: Multi-walled carbon nanotubes;    Cyclic voltammetry;    Potassium ferricyanide;    Electrochemical characterization;   

DOI  :  10.1016/j.susc.2011.09.001

来源: Elsevier

【 摘 要 】

This paper describes the electrochemical investigation of two multi-walled carbon nanotube-based electrodes using potassium ferricyanide as a benchmark redox system. Carbon nanotubes were fabricated by chemical vapor deposition on silicon wafer with camphor and ferrocene as precursors. Vertically-aligned as well as islands of horizontally-randomly-oriented carbon nanotubes were obtained by varying the growth parameters. Cyclic voltammetry was the employed method for this electrochemical study. Vertical nanotubes showed a slightly higher kinetic. Regarding the sensing parameters we found a sensitivity for vertical nanotubes almost equal to the sensitivity obtained with horizontally/randomly oriented nanotubes (71.5 +/- 0.3 mu A/(mM cm(2)) and 62.8 +/- 0.3 mu A/(mM cm(2)), respectively). In addition, values of detection limit are of the same order of magnitude. Although tip contribution to electron emission has been shown to be greatly larger than the lateral contribution on single carbon nanotubes per unit area, the new findings reported in this paper demonstrate that the global effects of nanotube surface on potassium ferricyanide electrochemistry are comparable for these two types of nanostructured surfaces. (C) 2011 Elsevier B.V. All rights reserved.

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