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Bioelectrochemistry Studies Based on Functional Halloysite Nanomaterials

Author: SunXiuMei
Tutor: JiaNengQin
School: Shanghai Normal University
Course: Physical and chemical
Keywords: Kaolin Direct electrochemical Horseradish peroxidase Ordered Mesoporous Carbon Peroxide
CLC: TP212.3
Type: Master's thesis
Year: 2011
Downloads: 47
Quote: 0
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Abstract


The direct electrochemical oxidoreductases and proteins and other biological macromolecules caused widespread concern of the scientific community, because it is not only the study of biological oxidation the restore process thermodynamics and kinetics ideal model, but also for the development of high selectivity, high sensitivity and high The stability of the bio-electrical sensors provide a potential prospects. However, due to the redox-active center is deeply embedded in the protein shell, so most of the redox protease are difficult to achieve in the conventional electrode on direct electron transfer process. This thesis to new nanomaterials such as halloysite nanotubes for biological carrier and molecular wires, to build biomolecules / micro and nano materials, nano interface on a conductive substrate, suitable biological microenvironment for redox proteins and enzymes of biological macromolecules, to achieve direct electron transfer and get the excellent bioelectrocatalysis performance. The study provides valuable theoretical and practical basis of in-depth understanding of the proteins and enzymes of biological macromolecules in pass life vivo electron reaction mechanism as well as the development of new biological sensors, fuel cells, bio-electronic devices. The research work of this paper are as follows: 1, immobilization of horseradish peroxidase based on halloysite nanotubes / chitosan composite film direct electrochemical and electrocatalytic. Halloysite nanotubes using new material as a carrier, horseradish peroxidase provides a suitable biological microenvironment to promote its redox-active center of Fe (III) / Fe (II) redox fast electron transfer, while taking advantage of the kaolin nano The composite membrane of the tube with chitosan to improve the stability of the modified electrode. Spectroscopy, AC impedance, cyclic voltammetry, chronoamperometry good film properties, horseradish peroxidase in the membrane to maintain the native conformation and display good electrochemical behavior. Halloysite nanotubes / chitosan composite film to achieve the direct electron transfer of horseradish peroxidase, while improving the sensitivity of hydrogen peroxide catalyzed. 2, functionalized halloysite nanotubes - gold nanoparticle composites and their electrochemical applications. By TEM, Zeta and UV characterization composites success, and cyclic voltammetry and AC impedance analysis to improve said Mingjinnami the presence of particles the surfactant modified electrode prepared without enzyme sensor can be used for linear detection of hydrogen peroxide effectively avoid the easy deactivation characteristics of traditional enzyme sensor, while the presence of gold nanoparticles modified electrode sensitivity of hydrogen peroxide catalyzed. 3, based on the mesoporous carbon heme fixed bioelectrochemistry research. The TEOS and F127 for the synthesis of carbon - silicon nanomaterials, mesoporous carbon nanomaterials removed by HF silicon frame. Through TEM, and the BET characterization has a two-dimensional hexagonal mesoporous carbon with a high degree of sequence structure, a high surface area (2066 m 2 / g) and large pore volume (1.64cm 3 < / sup> / g) and narrow pore size distribution. Raman analysis showed that the more the edge of the defect sites mesoporous carbon, and therefore has a greater activity. Mesoporous carbon reinforced heme in the electrode surface adsorption amount to promote its electron transfer, the electron transfer rate 2.7s -1 , the modified electrode enhanced detection sensitivity of hydrogen peroxide.

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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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