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The Application of Carbon Nanotubes in Glucose Biosensors

Author: DuanDaXue
Tutor: ChuXia
School: Hunan Normal University
Course: Analytical Chemistry
Keywords: Carbon nanotubes Biosensor Modified electrode Platinum nanoparticles Gold sol Glucose oxidase Poly - L - lysine Naphthol
CLC: TP212.3
Type: Master's thesis
Year: 2006
Downloads: 332
Quote: 0
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Abstract


Carbon nanotubes for its unique mechanical strength, high specific surface area, the effect of fast electron transfer and chemical stability, becoming one of the hot spots of various disciplines. Unique electronic structure of carbon nanotubes in recent years because it is widely used in electrochemical biosensors. Carbon nanotube modified electrode can not only improve the speed of electron transfer, but also due to its large surface area and can be used as an excellent catalyst carrier. In this paper, multi-wall carbon nanotubes as the research object, and to extend the application of multi-wall carbon nanotubes in the field of electrochemical biosensor divided into three parts, for the purpose of study. The first part discusses the electrochemical behavior of multi-walled carbon nanotubes were covalently immobilized on a gold electrode and a glucose biosensors: self-assembled on a gold electrode layer thioglycolate ammonia, purify, carboxylated multi-walled carbon nanotubes (MWNTs) solution droplets on the surface of the electrode available Au / MWNTs modified electrode. Modified electrode by electrochemical deposition to build a new composite material of the nano-platinum (Pt) on the CNT electrodes. And were characterized by scanning electron microscopy of the composite. Experiments show that high dispersion larger than the surface area of ??the nano of MWNTs / Pt modified electrode showed a good electrocatalytic activity of the H 2 O 2 oxidation. MWNTs / Pt substrate, made gold nanoparticles adsorbed glucose oxidase glucose biosensor, the sensitivity of the sensor, wide linear range and good stability. The second part examines the amine groups of modified carbon nanotubes. The use of poly-L-lysine modified carbon nanotubes, and then use the glutaraldehyde crosslinking immobilization of glucose oxidase, such a fixing method of the enzyme molecules can be increased to a fixed number of molecules, thereby enhancing the response signal. Nafion is a perfluorinated sulfonic acid ester polymer electrolyte, can be well dissolved carbon nanotubes. We modified the glucose oxidase carbon nanotubes and Nafion mixed, and then coated with platinum nanoparticles modified gold electrode successfully prepared glucose biosensors. The experimental results show that the sensor has a short response time, high sensitivity, good stability. The third part of the embedded nanotubes to poly-L-lysine (polylysine) and glucose oxidase preparation glucose biosensor. Poly-L-lysine (polylysine) strong protein adsorption capacity and the ability to maintain the protein structure unchanged. Carbon nanotubes and glucose oxidase was added to the solution of poly-L-lysine, fully mixed ultrasound 30min then coated with a layer of film on a platinum electrode made of glucose biosensors. The experiments show that carbon nanotubes can increase the catalytic activity of the enzyme so that the enzyme electrode electrically

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor > Biological sensors,medical sensors
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