Studies On Nonenzymatic Glucose Sensing And Supercapacitor Based On C/TiO₂ Composite Nanotube Arrays

Titania nanotubes arrays (TiNTs) have been applied in a variety of research fields including biosensors, hydrogen sensor, highly efficient photocatalysis, photolysis of water, solar cell, supercatacitor and so on. due to their specific advangtages, such as large surface area, good capacity, strong adsorptive capacity, and excellent biocompatibility, and stability etc. Therefore, preparation and functionalization TiNTs are is significant. In this paper, we firstly studied the preparation of carbon functionalized TiNTs nanocomposites, and then applied them in the construction of nonenzymatic glucose sensor and supercatacitor. The main contents for the thesis are as follows:In the first chapter, we decribed the concept, the recent development and application of the nanomaterial, glucose sensor and supercapacitor. Mainly decribed the synthesis and modification of TiNTs, recent research progress of nanomaterial in glucose sensing and the application of metal nanomaterials in supercapacitor.The second chapter mainly focused on Ni(OH)2 nanoparticles modified TiOxCy nanotube arrays for nonenzymatic glucose sensing. First, we prepared TiNTs by anodie oxidization, and then converted the TiNTs into an oxycarbide compound (TiOxCy) at a high temperature in ethylene atmosphere. The resulting nanotube showed an improved conductivity. Ni(OH)2 nanoparticles are decorated homogeneously on the TiOxCy nanotube arrays by chemical bath deposition method. In this paper, the influences of nanotube electroconductivity and Ni(OH)2 amount on the performance of glucose sensing were investigate. The experimental results show that the Ni(OH)2/TiOxCy electrodes exhibit fast response time (<5 s), high sensitivity (0.12 mA/mM), wide linear rage (0.02-11 mmol/L), low detection limit (5.0 ?mol/L), good anti-interference property, and long-term stability for glucose electrooxidation. These results indicate potential practical application of the hybrid electrode in developing nonenzymatic biosensors.In the third chapter, we use C/TiNTs and RuO2 as electrode material for supercapacitor and studied the capacitance performance of RuNP/C/TiNTs composite nanomaterials. Carbon (C) decorated TiNTs (C/TiNTs) were prepared by a one-step annealing method at 450? Copper (Cu) nanoparticles were deposited on the surface of C/TiNTs by chemical reduction method, and then by the galvanic replacement technology Ru nanoparticles (RuNP) are decorated on the TiNTs. The SEM, XPS, ICP-MS techniques were used in this chapter to character RuO2/C/TiNTs composite nanomaterials. The results showed that RuO2 were successfully modified on the C/TiNTs, and the amount of RuO2 is about 2.67%. Cycle voltammetry, galvanostatic charging/discharging and electrochemical impedance spectroscopy tests were applied to study the capacitance performance. Compared with C/TiNTs and RuO2/TiNTs, the composite material showed better electrochemical capacitance properties. The results demonstrate that the use of RuO2 can improve the capacitance of material greatly. The specific capacitance of the RuO2/C/TiNTs composite can remain 79.5% of the initial value after 510 charging-discharging cycles.