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Research and Application of Electrochemical Sensor Based on the Carbon Nanotube Modified Electrode

Author: ChangYan
Tutor: DongChuan
School: Shanxi University
Course: Analytical Chemistry
Keywords: Chemically modified electrode Carbon nanotubes Peroxide Acetamide -L-cysteine Lead
CLC: TP212.2
Type: Master's thesis
Year: 2009
Downloads: 88
Quote: 1
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Abstract


Chapter: a brief overview of the characteristics of chemically modified electrodes, research status and its applications. Mainly expounded the the modified electrode method, as well as features of the modification of one of the materials of carbon nanotubes and chemically modified electrode. Chapter II: electrodeposition of nickel nano MWCNTs-Nafion modified glassy carbon electrode prepared the the of MWCNTs-Ni (OH) 2 / GCE electrode to optimize the preparation conditions, using transmission electron microscopy, cyclic voltammetry Security Law, electrodes were characterized. Of MWCNTs-Ni (OH) 2 / GCE electrode for detecting hydrogen peroxide. The results showed that the unmodified glassy carbon electrodes need higher potential in order to peroxide hydroxide composite film modified glassy carbon electrode than single modified multi-walled carbon nanotubes, or electro-catalytic activity of nickel hydroxide, 0.1mol/LNaOH supporting electrolyte solution of hydrogen peroxide have good response response signal sensitivity increase. Of the sensor, the average response time of 5 seconds, and the hydrogen peroxide concentration to 1.5 × 10 -6 -2.5 × 10 -3 mol / L was a good linear relationship ( r 2 = 0.9982), the signal to noise ratio of three times the detection limit of the sensor for of 6.1 × -7 mol / L. And the actual sample recovery experiments. The results show that such a sensor has good reproducibility, easy operation, fast detection. This method improves the response signal of hydrogen peroxide, and expansion of existing measurement techniques, not only has an important theoretical significance, but also has potential applications. Chapter III: in lye, nickel hydroxide can catalyze methane generation of formaldehyde and carbon dioxide, this change may cause the electrode current and the potential change of the signal. Based on the above principle, use the same method of electrodeposited nickel nano MWCNTs-Nafion modified glassy carbon electrode prepared MWCNTs-Ni (OH) 2 / GCE, design a simple, sensitive and methane electrochemical sensor. Nickel hydroxide modified nickel electrodes in electrochemical activity compared explore the electro-catalytic oxidation mechanism. The experiments show that the composite film modified electrode methane a good catalytic oxidation response. Chapter IV: N-acetyl-L-cysteine ??(N-Acetyl-L-Cysteine, NAC) as glutathione precursor is an important a mercapto supplying agent in the anti-apoptotic drugs occupies important position with anti-drug and anti-oxidation, eliminate free radicals, prevent radiation damage role. In the role of potassium ferricyanide 2RSH → RS-SR 2e 2H . CD with guest molecules to form inclusion complexes match and the energy required to meet the size to match. Based on the above principle, we Nafion fixative, cyclodextrin and carbon nanotube fixed on a glassy carbon electrode was prepared β-cyclodextrin - carbon nanotube modified glassy carbon electrode (β-CD-MWCNT/GCE ), to design a simple, rapid, sensitive and high stability NAC electrochemical sensors. Glassy carbon electrode (GCE) as the working electrode in a buffer solution (pH = 8) studied the potassium ferricyanide (K 3 Fe (CN) 3 ) electrocatalytic The electrochemical behavior of the N-oxide the acetamide-L-cysteine ??(NAC). The experimental results showed that the direct reduction reaction occurs within the potential window of the-0.7-0.20V is not easy, with the potential positive shift current gradually increased, but no reduction peak, while in the buffer solution (pH = 8) in, when K 3 Fe (CN), 6 solution was added N-acetamide-L-cysteine ??after 0.23V at an irreversible catalytic oxidation peak, and the oxidation peak current is increased, It is suggested that K 3 Fe (CN) 3 has a good electrocatalytic activity for the oxidation of NAC. When K 3 Fe (CN) 6 to 1.0 × 10 -3 mol / L, the electro-catalytic oxidation peak current NAC concentration in 4.4 x 10 -4 mol/L-8.0 10 -2 mol / L range a good linear relationship between the detection limit of 5.02 × 10 -5 < / sup> mol / L (S / N = 3), the relative standard deviation of 3.4% using the the spiked recovery method examined the possibility of practical application, the recovery rate of 94.7% to 104.7%. This method makes the electrochemical method determination the NAC is simple, sensitive and reproducible. Chapter V: Nafion is a perfluorinated polymers sulfonate cation exchanger, the view of the application of carbon nanotubes in environmental analysis, we also studied the preparation of a carbon nanotube-Nafion composite film modified glassy carbon electrode, used for the detection of lead ions. Optimization of experimental conditions, 4min as enrichment time,-1.2V standard curve for the detection of lead ions in the case of accumulation potential: Ip = .5527 0.1009C linear correlation coefficient of 0.9684. To establish a practical detection method for non-mercury electrode detection of lead ions.

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