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Precious -TiO_2 Nano Composite Electrode and biological properties of electrochemical sensors

Author: CuiHuCheng
Tutor: KangChuanHong；JingLiQiang
School: Heilongjiang University
Course: Biochemistry and Molecular Biology
Keywords: TiO2 nano-material charge transfer photocatalysis bioelectrochemic
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 125
Quote: 1
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Abstract


Nano-sized TiO2 is one of the most promising semiconductor photocatalysts because of its superior photocatalytic activity, high photocatalytic efficiency, nontoxicity, and strong oxidizing ability. And the application of nano-sized TiO2 has attracted much attention in the field of bioelectrochemistry. However, how to synthesize anatase TiO2 with high crystallinity and large surface area is key point to gain high sensitivity enzyme bioelectrochemistry sensing property. Nano-sized TiO2 with high crystallinity, large surface area and high charge transfer capacity were designed and synthesised by surface-modificating meso-porous SiO2 and compositing with CNTs, and the bioelectrochemistry electrode was constructed by photoreduction depositing noble metal Au and immobilizing active enzyme, as well as the influence of the structure characteristic on electrochemical sensing properties were also mainly investigated, moreover, the process mechanism and inner influencing factors were revealed by photocatalytic process, SPV technique, electrochemical impedance spectra and cyclic voltammetry, which should provide dependencies and directions for constructing novel bioelectrochemistry. As follows:Nanocrystalline anatase TiO2 was obtained by a sol-hydrothermal process, In order to further improve crystallization degrees of the nanocrystalline anatase TiO2, while maintaining its large surface area, the investigation on sol-hydrothermal synthesis of nanocrystalline anatase TiO2 surface modification was carried out. The results show that the surface modification significantly improves the thermal stability and crystallization degree of nano-sized TiO2, at the same time conduces to the maintenance of small size. High crystallization degree is favor to improve the charge separation and transport. Therefore, the enhanced crystallization degree and the maintained surface area decide that the appropriate modified mesoporous silica TiO2 nanoparticles can display high photocatalytic activity. High crystallization degrees and large surface area of nano-sized TiO2 provides the foundation for the design and synthesis of the enzyme sensor to build high-performance electrode materials. The results of electrochemical impedance spectra and cyclic voltammetry can further confirm that the structural characteristics of TiO2 nanoparticles with high crystallization degrees and large surface area is propitious to enhance the immobilization of the biological activity enzyme and the charge transfer capabilities, thus significantly improving the sensor performance of the TiO2-based bioelectrochemical substrate electrode.Furthermore, a simple Synthesis method of one-pot two-phase-separated hydrolytic-hydrothermal process was developed. The method without any following calcination can directly synthesized the TiO2 nanoparticles with fewer defects, high crystallization degree and excellent photocatalytic activity, namely it can own the good electron-transfer capacity. Moreover, titanium dioxide-based nano-materials with better photocatalytic activity and electron-transfer capacity were obtained by the effective compound of carbon nanotube and nano-titanium dioxide directly and controllable, so that its novel bioelectrochemical composite electrode could reveal good Bio-sensing properties. The work should afford the practical and theoretical principle for design and synthesis of high capable enzyme sensor.

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