| 초록 |
Vertically aligned various TiO2 nanostructures were synthesized using a hydrothermal reaction. Thebrookite structures have unique bullet-shaped structure which had a length of 700~1000 nm and a width of 150-250 nm with the sharpened tip structure. By adjusting concentration of NaOH in hydrothermal reaction, we could also synthesize other types of TiO2 nanostructures including anatase TiO2 nanotubes/nanowires. The morphologies and crystal structures of the products were confirmed by the SEM, TEM and XRD analysis. The photoelectrochemical properties such as photocurrent density and open circuit voltage were measured in a three-electrode electrochemical cell with TiO2nanoarrays, Ag/AgCl and Pt flag as the working, reference and counter electrode, respectively, incorporating a 0.1M NaOH electrolyte solution. The fabricated brookite TiO2nanoarrays exhibited highly enhanced photocurrent density and the longer electron life time compared with anatase TiO2nanoarrays with similar lengths. |
