Surface modified TiO2 nanostructures with enhanced bio-sensitivity and photocatalytic properties
碩士 === 國立中央大學 === 材料科學與工程研究所 === 102 === Titanium oxide (TiO2) has been widely applied in photocatalysts, sensors, solar cells, biomaterials, self-cleaning and so on. The surface morphology and surface chemical modification play important role in the properties of TiO2. This study employed a supercr...
| Main Authors: | , |
|---|---|
| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2014
|
| Online Access: | http://ndltd.ncl.edu.tw/handle/62999830254530740437 |
| Summary: | 碩士 === 國立中央大學 === 材料科學與工程研究所 === 102 === Titanium oxide (TiO2) has been widely applied in photocatalysts, sensors, solar cells, biomaterials, self-cleaning and so on. The surface morphology and surface chemical modification play important role in the properties of TiO2. This study employed a supercritical-CO2-fluid (ScCO2) cleaning process to modify the chemical properties of anodic TiO2 nanotubes surface. We found that ScCO2-treated TiO2 nanotubes can effectively change their surface wettability as a result of photo-oxidation of C-H functional groups formed on the TiO2 surface. In addition, the crystal structure of TiO2 nanotubes transformed from amorphous phase to anatase after annealing at 450 °C for 2 hours. The C-H functional groups of annealed TiO2 nanotubes were significantly less than amorphous TiO2 nanotubes after the ScCO2 cleaning process. We demonstrated a switchable superhydrophilicity of ScCO2-treated anodic TiO2 nanotubes with UV-light irradiation.
In the following, TiO2 nanofibers with different size and crystal structures have been synthesized by electrospinning and further decorated with silver nanoparticles through antibody-mediated synthesis. The study indicates that Ag nanoparticles are uniform deposited on TiO2 nanofibers. Ag-TiO2 nanofibers possessed superb photocatalytic activity for the degradation of Rhodamine B ( RhB ) dye. This study also demonstrates that TiO2 nanofibers possess intrinsic peroxidase-like activity in suitable condition. Ag-TiO2 nanofibers show excellent catalytic performances and good biocompatibility so that they can be used a colorimetric biosensor for glucose detection.
|
|---|