Authors: Shenghui Zhang; Wanyun Qu; Wensheng Huang; Yongyao Wu

Source: Journal of Nanoscience and Nanotechnology, Volume 4, Number 5, October 2004 , pp. 553-557(5)

Publisher: American Scientific Publishers

Abstract:

A novel chemically modified electrode has been prepared on the basis of the attachment of multiwall carbon nanotubes (MWNT) onto the surface of a glassy carbon electrode (GCE) in the presence of a hydrophobic surfactant, dihexadecyl phosphate (DHP). This MWNT film was characterized by transmission electron microscopy images (TEM) and scanning electron microscopy (SEM). The electrochemical behavior of tyrosine at the MWNT film coated GCE was examined and it is found that this MWNT-modified GCE greatly enhances the oxidation peak current of tyrosine. Effects of some important factors, including pH, scan rate and amount of modifier, on the oxidation process of tyrosine were investigated. When the signal to noise ratio (SNR) is 3, the detection limit is 1 x 10^-7 M. The low relative standard deviations of the detection of tyrosine in human morning urine (3.3%) and white wine (5.2%) suggest a good reproducibility of the modified electrode.

Keywords: MULTI-WALL CARBON NANOTUBES; TYROSINE; MODIFIED ELECTRODE; ELECTROCHEMICAL DETERMINATION

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2004.123

Publication date: 2004-10-01

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