| 학회 | 한국재료학회 |
| 학술대회 | 2017년 가을 (11/15 ~ 11/17, 경주 현대호텔) |
| 권호 | 23권 2호 |
| 발표분야 | B. 나노화학/바이오 분과 |
| 제목 | The new synthesis method of N-doped TiO2 nanoparticles by plasma electrolyic oxidation and its photocatalytic property in visible region |
| 초록 | Titanium oxide is one of the most researched material due to it physical and chemical property and used in many application field such as photocatalyst, transparent conducting oxide, dye sensitized solar cell and etc. Especially in photocatalytic area, it has been extensively studied as powerful organic decomposing material. Generally, TiO2 nanoparticles are synthesized through sol-gel, hydrothermal and precipitation methods. However, these methods need to precisely control solution pH, temperature with long reaction time and after that, washing organic compounds and drying process is essential. To overcome these disadvantages, plasma electrolytic oxidation method was adopted. This method was originally used to produce thick and durable oxide layer on the easy-corrosive metal surface to prevent from corrosion in air ambient using small amount of electrolyte and short reaction time. However, despite the high efficiency of TiO2, large band gap has great disadvantages to be used in sunlight because it can use only 5% of sunlight energy. To enhance the photocatalytic activity, many research have been proceeded such as anion, cation doping and co-catalyst. Among those, N doping into the TiO2 has been extensively studied due to its similar characteristics with O2 molecules which can be easily doped as substitutional or interstitial and especially narrowing bandgap as high as 2.6 eV. Thus, it widen the usage of sunlight of UV and visible region. By controlling experimental conditions, amorphous TiO2 nanoparticles could be synthesized. Changing the experimental condition such as electrolyte concentration, nanoparticle size could be controlled between 16 and 28 nm with uniform size distribution. To analyze photocatalytic property depending on the structure, produced amorphous TiO2 was transformed into anatase, through different calcination temperature. Photocatalytic efficiency was measured by decomposing methylene blue organic dye solution with 300 W xenon lamp. The calcination condition of 200oC with anatase phase showed best degradation property. We believe that this new TiO2 nanoparticle synthesis method would contribute to the industrial field with high quality and mass production. |
| 저자 | 김태형, 박경수, 이찬기 |
| 소속 | 고등기술(연) |
| 키워드 | <P>plasma electrolyic oxidation; N-doped TiO2</P> |
