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Electrochemical Behavior and Determination of Several Small Biomolecules at Carbon Nanotubes Modified Gold Electrodes

Author: WeiShuHong
Tutor: ZengBaiZhao
School: Wuhan University
Course: Analytical Chemistry
Keywords: Uric acid Folate Rutin Single- walled carbon nanotubes Multi-walled carbon nanotubes Gold electrode Cyclic voltammetry Electrochemical behavior
CLC: O646.54
Type: Master's thesis
Year: 2005
Downloads: 255
Quote: 1
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Abstract


Carbon nanotubes (CNTs) are constituted by a carbon fiber tubular one-dimensional. Since the discovery of carbon nanotubes on its unique mechanical, electrical and chemical properties and quickly became chemistry, physics and materials science and other areas of research focus. As a new nano-materials, carbon nanotubes have high electrical conductivity, chemical stability and mechanical strength and other characteristics. Modified electrode was prepared using the carbon nanotube is expected to facilitate electron transfer of biological molecules, accelerating the electrochemical reaction. In this paper, carbon nanotubes (including single-walled carbon nanotubes and multi-walled carbon nanotubes) modified electrode was studied uric acid, folic acid and rutin electrochemical behavior and establish a rapid and sensitive electrochemical detection method. Specific studies are as follows: 1. Studied uric acid in the single-walled carbon nanotube modified gold electrodes (SWNT / Au) on the voltammetric behavior. In 0.1mol L -1 HAc-NaAc (pH 5.0) solution of uric acid in the SWNT / Au electrode effectively enriched and 0.45V produce a sensitive oxidation peak. To investigate the usefulness of its analysis, we determine the conditions (eg, pH, accumulation time and the amount of SWNTs) were optimized, found in the selected conditions, uric acid oxidation peak current and the concentration in 1.0 × 10 -7 mol L -1 -2.5 × 10 -5 mol L -1 rendered within the scope of good linear relationship. The electrode is easily regenerated, and has good stability. Using this method successfully on human urine uric acid concentrations were determined. On xanthine, the impact of ascorbic acid were tested and found in a certain concentration range, they can be determined simultaneously, do not interfere with each other. (2) using cyclic voltammetry, chronoamperometry and chronocoulometry for folic acid in a multi-walled carbon nanotube modified gold electrode (MWNT / Au) on the electrochemical behavior was studied. The electrode of the electrochemical response of folic acid has a good role in promoting. In 0.1mol L -1 H 3 PO 4 -NaH 2 PO 4 (pH = 2.5) solution, and folic acid in the MWNT / Au electrode at 0.83V or so to produce a sensitive oxidation peak. The test conditions, such as: pH value, accumulation time, accumulation potential and scan rate were discussed. In selected conditions, the peak current and the concentration of folic acid in 2.0 × 10 -8 mol L -1 -1.0 × 10 -6 mol L -1 there is a linear relationship between the detection limit of 5.0 × 10 -9 mol L -1 . The method was successfully applied to the folic acid folic acid tablets detection. In addition, folic acid MWNT / Au electrode electrochemical reaction parameters were measured, such as electronic transfer number n (2), the standard potential E 0 (0.79V vs.SCE), exchange current density j 0 (6.76 × 10 -5 Acm -2 ), the standard rate constant k 0 (3.50 × 10 -2 cm s -1 ) and the diffusion coefficient D (1.14 × 10 -5 cm 2 s < sup> -1 ) and so on. On the impact of several surfactants also discussed. 3 by cyclic voltammetry and chronocoulometry right rutin in single-walled carbon nanotubes modified gold electrode (SWNT / Au) on the electrochemical behavior was studied. The modified electrode electrochemical reaction of rutin has a good role in promoting.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Electrochemical,electrolytic,magnetic,chemical > Electrolysis and Electrode role > Electrode process
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