Nano Archive

Single-walled carbon nanotube-arrayed microelectrode chip for electrochemical analysis

Okuno, Jun and Maehashi, Kenzo and Matsumoto, Kazuhiko and Kerman, Kagan and Takamura, Yuzuru and Tamiya, Eiichi (2007) Single-walled carbon nanotube-arrayed microelectrode chip for electrochemical analysis. ELECTROCHEMISTRY COMMUNICATIONS, 9 (1). pp. 13-18.

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The development of a single-walled carbon nanotube (SWCNT)-arrayed microelectrode chip is reported here. SWCNT-arrayed electrodes were formed directly on Pt surfaces, and were also arrayed on the chip. The electrochemical characteristics of the devices were investigated using potassium ferricyanide, K-3[Fe(CN)(6)] in connection with cyclic voltammetry (CV). The electrochemical signals of electro-active amino acids; L-Tyrosine (Tyr), L-Cysteine (Cys) and L-Tryptophan (Trp) were detected using differential pulse voltammetry (DPV). The chip operated at a lower oxidation potential (vs. Ag/AgCl) compared with conventional carbon and Pt disc electrodes in 50 mM phosphate buffer solution (PBS, pH 7.4). The linear response was observed between 0.1-1 mu M and 100 mu M for the amino acids with correlation coefficients higher than 0.99. The electrochemical measurements of K-3[Fe(CN)(6)] and amino acids revealed that the peak current intensities using SWCNT-arrayed electrodes were about 100-fold higher than those using bare Pt-arrayed microelectrodes. Additionally, the surface area dependence of the peak current responses was plotted. We concluded that our chips with SWCNT-arrayed microelectrodes provided a promising platform for electrochemical applications. (c) 2006 Elsevier B.V. All rights reserved.

Item Type:Article
Uncontrolled Keywords:single-walled carbon nanotubes; arrayed microelectrodes; amino acids; tyrosine; cysteine; tryptophan
Subjects:Analytical Science > Nanotechnology for sensing and actuating
Physical Science > Nanoelectronics
Material Science > Nanochemistry
ID Code:3232
Deposited By:Anuj Seth
Deposited On:14 Jan 2009 13:41
Last Modified:20 Jan 2009 15:55

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