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Fabrication of TiO2 Nanotubes and Its Investigation for Biosensor

Author: FanXiaoYan
Tutor: ZhangYunHuai；XiaoPeng
School: Chongqing University
Course: Inorganic Chemistry
Keywords: TiO2 nanotubes Anodization Roast Electrochemical Properties Biosensing
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 248
Quote: 2
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Abstract


TiO2 nanotubes due to the large specific surface area and nano-size effect, compared with other forms of nanostructures, TiO2 nano-tubes in the field of photocatalysis, sensors, solar cells show great potential for development, has become the international nanomaterials One of the research focus. In this paper, electrochemical anodic oxide prepared by a highly ordered orientation of TiO2 nanotube arrays of different electrolytes preparation parameters (anodization voltage, time, pH value, etc.) the impact of the growth of TiO2 nanotubes, and anodized TiO2 nanotube arrays prepared by the growth mechanism are discussed. The experiments show that, in a certain voltage range, different voltages can be different diameters of TiO2 nanotubes; pH value determines the size of the ability to form the structure of the nanotubes; Time is a key factor in decision nanotube length. Preferred conditions for preparing aqueous systems for the pH = 4, the anodic oxidation time of 3 hours, the anodization voltage is between 10 ~ 20V; preferred conditions for preparing the organic systems for the pH = 6, the anodic oxidation time was 10 hours, anodizing voltage range from 35 to between 60V. The XRD tests have shown that the prepared TiO2 nanotubes is amorphous. TiO2 nanotubes prepared calcination temperature calcination treatment in air and nitrogen atmosphere, the atmosphere, and to explore the TiO2 nanotube morphology and crystal structure of TiO2 nanotubes in the roasting process phase transition model and phase change mechanism. SEM, XRD results show that the calcination in air, when the temperature is less than 600 ° C, the nanotubes can maintain a more stable structure, none of the diameter and wall thickness change significantly when the temperature is greater than 800 ° C, the nanotubes structure began to collapse, and the anatase to rutile phase transition temperature to 700 ° C; calcined in nitrogen tube morphology changed significantly smaller diameter of the nanotube wall thickening, tube length becomes shorter when roasting The nanotube structure began to collapse, when the temperature reaches 700 ° C, anatase to rutile phase transition temperature of 600 ° C. The phase-change model and the mechanism of phase transition anatase to rutile phase transition, two main factors: First, the distribution of the oxygen ions in the structure of nanotubes; due to the Ti-O bond cleavage generated Ti4 ion dislocation. Cyclic voltammetry and electrochemical impedance spectroscopy, in-depth study of TiO2 nanotubes and electrochemical properties at different temperatures (300 ° C, 500 ° C, 600 ° C) with different atmosphere (air, nitrogen, carbon monoxide) after the calcination treatment. The study found, compared to 300 ° C, 600 ° C calcination treatment samples calcined at 500 ° C under TiO2 nanotubes electrode has good electrical conductivity; uncalcined TiO2 nanotube electrode cyclic voltammetry response is not reversible electron transfer reaction; air after the calcination treatment of TiO2 nanotubes electrode cyclic voltammetry response the adsorption irreversible reaction; calcination treatment in nitrogen TiO2 nanotubes electrode cyclic voltammetry response showed a better voltammograms , the oxidation peak reduction peak potential separation ΔEp for 0.267V, meet the standards of the quasi-reversible reaction, the electrodes of the electron transfer rate constant k 0 = 1 .11 x 10? 3cm / s; TiO2 nano carbon monoxide atmosphere after the calcination treatment tube electrode cyclic voltammetry response showed a better voltammograms, the oxidation peak and the reduction peak potential the separation ΔEp 0.163V, meet the standards of the quasi-reversible reaction, electrode electron transfer rate constant k 0 = 2.76 × 10? 3cm / s. Horseradish peroxidase (HRP) and electron mediator thionine (Th) modified by the co-adsorption method on TiO2 nanotubes electrode prepared TiO2 nanotubes mediated type enzyme electrode. Explored by cyclic voltammetry and amperometric the TiO2 nanotubes enzyme electrode the H2O2 catalytic effect of different concentrations of to deduce linear fit and the relationship between the current response and the concentration of H2O2, TiO2 nanotubes electrode in a carbon monoxide atmosphere after the calcination treatment, H2O2 response range of 0.5 × 10-5 ~ 11 × 10-3 mol / L, the sensitivity of 89μA/mmol/L, not calcined TiO2 nanotubes electrode 6-7 times, after the calcination treatment in air TiO2 nanotubes electrode 4 times the detection limit of 0.5 × 10-6 mol / L.

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