산화 티타니아 나노구조의 형태학적 변화에 미치는 핵심요소

초록

In our previous study, we found that anodization of titanium in limited condition leads to produce TiO2 microcone which has high capacity as anodic electrode for lithium ion battery. Detailed structural study is carried out since morphological element is not negligible effect on application. We observed the transition of TiO2 nanostructure, in terms of the applied potential and the concentration of fluoric acid and sulfuric acid. Interestingly, as voltages goes up, titanium oxides transform from anatase nanotubes to amorphous microcone. Note that this phenomenon can be appeared in the specific concentration of HF. The formed microcones have an average diameter of 2.58 μm and a height of 3.88 μm. We also established the mechanism of TiO2 microcone, showing formation process as a function of anodizing time, based on the changes in the molar volumes of titanium metal and its oxides. Because of the various functional properties of TiO2, we expected TiO2 microcones are applied to water splitting, dye-sensored solar cells(DSSCs), photocatalyst, and gas sensors.