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Preparation and Electrochemical Study of Carbon Nanotube Electrodes Modified with Layered Double Hydroxides-Intercalation Compounds

Author: BaiPeiFeng
Tutor: LiFeng
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: Hydrotalcite Carbon nanotubes Fluorescein Potassium ferricyanide Composites Chemically modified electrode Electrochemical analysis
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 122
Quote: 0
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Abstract


Carbon nanotubes as an important class of one-dimensional nanomaterials, because it has a large specific surface area, high aspect ratio, excellent electrochemical properties, good chemical stability and other special performance in composite materials, electrical materials, chemical sensors and biomedicine, there is a wide range of applications. But the preparation of the nanotube surfaces rendered chemically inert, a poor dispersibility in a solvent, is difficult to combine with the substrate, and therefore physical modification of the surface of the carbon nanotube, the chemical modification, the graft, with the derivatization, change nanotubes performance of the surface has become a hot topic. Especially the surface of carbon nanotubes after modification graft and inorganic nano-particles, polymers, proteins, amino acids biological molecules greatly expanded its application in the field of electrochemical analysis. Layered double hydroxides metal hydroxide and hydrotalcite (LDHs) as an important class of anionic layered functional materials, the adsorption ability, good biocompatibility, high chemical stability and catalytic performance, therefore the function of hydrotalcite assembled modified electrode electrochemical biosensor was prepared with a very broad application prospects. Hydrotalcite nanoparticles also easy to aggregate, lack of decrease in the number of active centers and therefore inserted in the hydrotalcite interlayer anion and having electrochemical activity to find an excellent CNTs support to increase the number of active centers of the hydrotalcite, improved water the dispersion of the talc can be used to prepare functionalized the hydrotalcite / carbon nanotube composites and for the good performance of electrochemical analysis. In this paper, the surface was treated carbon nanotubes and a laminate of the electronegative polyacrylic acid with positive charge hydrotalcite electrostatic interactions, using the coprecipitation method ZnAl-LDH situ growth is assembled to the surface of carbon nanotubes, to obtain a water talc / carbon nanotube composites. Due to the adding of the carbon nanotubes, improve the dispersion and stability of the hydrotalcite. The effects of different proportions of hydrotalcite and carbon nanotubes of hydroquinone power analysis as well as the modification of the electrode on the electrochemical behavior of hydroquinone in different complexes. The results showed that the hydrotalcite and carbon nanotubes incorporated into the polyacrylic acid with carbon nanotubes to improve the rate of electron transfer in the electrochemical process, to improve the stability of the electrode composite modified electrode not only on the catechol good detection capability, but also be able to hydroquinone three isomers separately, with a low detection limit and high sensitivity. Fluorescein (F1) using the dye molecules on the electrochemical should play a role of the promoting agent, the luciferase is inserted into the interlayer of the hydrotalcite, the use of surface active agent to control the amount of luciferase intercalation, and fluorescein Hydrotalcites The one-step co-precipitation method of assembling to the surface of the polyacrylic acid-treated carbon nanotubes. The the different fluorescent prime inserted layer the LDH-PCNT complex modified electrode analysis of dopamine research results showed that the pH value of fluorescein intercalated hydrotalcite influence, fluorescein complexes not only hydrotalcite layer is inserted between and The intercalation complex good combination with carbon nanotubes with due to fluorescein accelerator effect and carbon nanotubes carrier medium body interaction, improved composite electrocatalytic ability dopamine modified electrode surface has a low detection limit. The use of electrically active species ferricyanide redox ability, potassium ferricyanide is inserted into the hydrotalcite interlayer, and grown to the surface of the polyacrylic acid treatment The carbon nanotube, hydrotalcite, carbon nanotube, different proportions of iron potassium cyanide intercalation the LDH-PCNT modified electrode electrochemical analysis of the ability of ascorbic acid. The results show that good electrocatalytic properties of the composite improve the stability of the potassium ferricyanide the capacity due to the the ferricyanide redox ability, electron transfer capability of the carbon nanotubes, hydrotalcite, different carbon nanotubes and intercalation volume electro-catalytic ability of ascorbic acid, when the ratio between the two is 0.3, the electrocatalytic properties of ascorbic acid on the electrode surface is controlled by the adsorption, high sensitivity and low detection limit.

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