Study of PH and Homocysteine Hybrid Sensor with TiO2 Nanotubes by Anodic Oxidation
| Autor: | Yu-Pei Huang, 黃育培 |
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| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 In this thesis, titanium oxide nanotubes fabricated by electrochemical anodized technique had been applied to pH sensors and amperometric homocysteine sensors. The highly ordered TiO2 nanotube arrays were fabricated by using electrochemical anodization in ethylene glycol electrolyte, NH4F and H2O. This thesis has used anodic oxidation method to fabricate the TiO2 nanotubes arrays using platinum (Pt) as a cathode. Effects of growth parameters such as reaction temperature, reaction voltage, concentration of ammonium fluoride and solution content on the formation of the TiO2 structures were studied. Field emission scanning electron microscopy was applied to analyze the characteristics of TiO2 nanotubes. The results showed a clean surface of prepared TiO2 nanotubes when an electrolye composition was 92wt% ethylene glycol: 0.36wt%NH4F: 7.3wt% DI water, anodizing voltages was kept at 30 V, and temperature was kept at 40 °C. The pH measurement showed a linear response approximately 49 mV/pH with potentiometric method and 27 uA/pH with amperometric method in the concentration range between pH 3 and 11. The sensitivity of homocysteine measurement using cyclic voltammetry is 144 nA/uM and the corresponding linearity is 0.994 in the homocysteine concentration is between 10uM and 70uM. It can be found that the surface morphology of the TiO2 nanotubes can effectively improve the sensitivity of the sensor. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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