TiO₂及其掺杂膜的制备、结构及性能研究

【作者】 韩莹莹；

【导师】 江晓红；

【作者基本信息】 南京理工大学 ， 材料加工工程， 2010， 硕士

【摘要】 TiO2化学稳定性好、无污染、成本低廉、光催化活性高,是目前最具开发前途的催化剂。然而,由于TiO2光催化剂主要依赖于紫外光,对可见光的利用率低,因此限制了它的应用。为了提高TiO2在可见光区范围的吸收,必须对其改性。本文采用电子束蒸发法分别制备了掺杂Fe、Cu、Al的TiO2薄膜,研究主要工艺参数：掺杂元素种类和含量、基底材料及退火温度对薄膜成分、结构和形貌的影响。借助原子力显微镜(AFM)、扫描电镜(SEM)、拉曼(Raman)光谱、X射线衍射(XRD)和X射线光电子能谱(XPS)等测试手段对薄膜的表面形貌、晶型结构和成分进行了表征,用紫外-可见分光光度计(UV-Vis)测试TiO2薄膜的吸光度,研究不同元素的掺杂对薄膜可见光吸收范围的影响。结果发现,金属离子的掺杂抑制了TiO2薄膜晶型的转变,并且掺杂后的TiO2薄膜吸收带边发生红移,扩展了其吸收波长的范围。采用电子束蒸发法制备了掺杂B的TiO2薄膜,探讨了在普通玻璃片、石英玻璃和陶瓷三种不同基底及不同退火温度下对薄膜成分、结构和形貌的影响。研究表明,在石英基底上制备的B-TiO2薄膜效果最好,同时B的掺杂也扩展了薄膜的吸收波长范围。将所制备的掺杂TiO2薄膜分别以一定比例添加到甲基橙溶液中,通过光催化实验研究其在不同光源、不同甲基橙初始浓度条件下的降解率,分析薄膜的制备工艺参数对其光催化作用的影响。更多还原

【Abstract】 TiO2 is regarded as the most promising catalytic due to its nature stability, avirulent, low-cost and high photocatalyst activity. However, it high photocatalyst performance strongly depend on the irritation of the UV light while the utilization of the visible light is limited, which severely limit its application. In order to make full use of the solar rays, the titanium dioxide must be modified.In this paper, Fe, Cu, Al-doped titanium dioxide (TiO2) thin films were prepared by electron beam evaporation method. The influence of substrate material, doping ions,dopping concentration and annealing temperature, etc. on the component, structure and the activities of the as-prepared TiO2 films were investigated. Atomic Force Microscope(AFM), Scanning Electron Microscopy(SEM),Raman Spectroscopy, X-ray Diffraction(XRD) and X-ray Photoelectrons Spectroscopy (XPS) were employed to characterize the surface morphology, the crystal structure and the component of the sample. In order to analysis the effect of doping different materials ions on the visible absorption range of TiO2 thin films, UV-Vis spectroscopy was used to test the absorption. Results showed that dopping of metal elements hindered phase transfer of TiO2, restrained growth of TiO2 particles and lead to red shift of the absorption limit of dopping TiO2 thin films, and expansion of absorbed wavelengths scope.The B-doped TiO2 films were prepared by electron beam evaporation for further research. The impact of different substrates (such as quartz, glass, ceramic) and annealing temperature on the component, structure and the morphology of the as-prepared TiO2 films. The results showed that the film prepared on the quartz exhibits best performance and the absorbtion wavelength range can also be expanded by dopping B.In the end, the photocatalyst property of the as-prepared TiO2 thin films are tested under different light source, different initial methyl orange concentration, and the preparation technical conditions on the photocatalyst property were analyzed.更多还原