School of Mechanical Engineering, Korea University, Seoul, 136-713 Korea.
Environ Sci Technol. 2012 Nov 20;46(22):12510-8. doi: 10.1021/es3037252. Epub 2012 Nov 6.
A simple and rapid room-temperature aerosol deposition method was used to fabricate TiO(2) films for photokilling/photdegradation applications. TiO(2) particles were accelerated to supersonic speeds and fractured upon impacting a glass substrate to form a functional thin film, a process known as aerosol deposition. After deposition, the films were annealed at various temperatures, and their photokilling/photodegradation performances following ultraviolet (UV) exposure were evaluated by counting the number of surviving bacterial colonies, and by a methylene blue decolorization test. The photocatalytic performances of all TiO(2) films were obtained under weak UV exposure (0.6 mW/cm(2)). The film density, crystalline phase, and surface roughness (morphology) were measured by scanning electron microscopy, X-ray diffraction, UV-visible spectroscopy, and atomic force microscopy. The unique, self-assembled honeycomb structure of the aerosol deposited films contributed to the increase in surface area because of extreme roughness, which enhances the photokilling and photodegradation performance. Nonannealed films yielded the best photocatalytic performance due to their small crystalline sizes and large surface areas due to increased surface roughness.
采用简单快速的室温气溶胶沉积法制备 TiO(2)薄膜，用于光杀/光降解应用。TiO(2)颗粒被加速到超声速，并在撞击玻璃基底时断裂，形成功能性薄膜，这一过程称为气溶胶沉积。沉积后，将薄膜在不同温度下退火，并通过计数存活的细菌菌落和亚甲基蓝脱色试验来评估其在紫外线 (UV) 暴露下的光杀/光降解性能。所有 TiO(2)薄膜的光催化性能均在弱 UV 照射下（0.6 mW/cm(2))获得。通过扫描电子显微镜、X 射线衍射、紫外-可见光谱和原子力显微镜测量薄膜密度、晶相和表面粗糙度（形貌）。由于极端粗糙度，气溶胶沉积薄膜的独特自组装蜂窝结构增加了表面积，从而提高了光杀和光降解性能。由于小的晶粒尺寸和由于表面粗糙度增加而导致的大表面积，未经退火的薄膜表现出最佳的光催化性能。
