Ga掺杂纳米TiO2薄膜的光电特性研究-毕业设计.docx

Ga掺杂纳米TiO2薄膜的光电特性研究-毕业设计.docxGa掺杂纳米TiO2薄膜的光电特性研究
摘要:利用射频磁控溅射法在玻璃衬底上制备了 Ga掺杂的TiO2薄膜，并在真空中于550°C下进行了 2小时的退火处理。釆用UV-VIS透过谱和PL光谱对薄膜进行了表征。UV-VIS透过谱表明，掺Ga 后的TiC»2薄膜吸收边发生了明显红移，且退火后进一步红移了 10~50nm。PL光谱说明薄膜具有一 定的光致发光性。通过测量薄膜表面水滴直径计算接触角的方法，发现55CTC退火2小时后的薄膜 具有良好的亲水性。光催化降解实验得出样品具有较强的光催化能力，低功率(15W)紫外灯照射 8小时后，%。
关键词：Ga掺朵；纳米TiO?薄膜；退火；红移；栄水性；光催化
Research on Optical and Electrical Properties of Gallium-doped
Nanometer TiO2 Thin Films
He Xuemin
Physics Sciences and Technology School, Zhanjiang Normal University, Zhanjiang 524048 , China
Abstract: The gallium-doped TiO2 thin films were deposited on glass substrate by RF magnetron sputtering, then the films were annealing treated in the atmosphere of vacuum for 2 hours at the temperature of 550°C. The films were characterized using UV-VIS transmission spectra and PL spectroscopy. UV-VIS transmission spectra show that the absorption edge of the Ga-doped thin films occurs obvious red-shift, even further red-shift 10 - 50nm after annealing. The films with a certain degree of photoluminescence by PL spectroscopy. The hydrophilicity of the films was studied by using the contact angle derived by measuring the diameter of water droplet on the surface of the samples. It was proved that the films have good hydrophilicity. The samples have good photocatalytic activity. The degradation rate of methylene blue solution reached % after 8 hours irradiation of low power ( 15W) UV lamp.
Keywords: Ga doping; Nano-TiO2 thin films; Annealing; Red-shift; Hydrophilicity; Photocatalytic
半导体光催化技术在太阳能转化和环境治理等许多方面有着广阔的应用前景。在诸 多光催化材料中，TiO2由于化学性质稳定、无毒、成本低和抗光腐蚀等优点而倍受青睐。 但对纯的TiCh而言，只有太阳光中的紫外光波段对其光催化起作用，太阳光的利用效 率不足5%,且光生电子与空穴容易复合，光催化效率不高，限制了其现实应用。为了 克服这些缺点，延伸TiCh在可见光区的响应，提高光催化反应效率，很多研究学者做 T TiO2的改性研究。主要方法有：贵金属修饰、半导体复合、染料敏化和金属离子掺 杂等。
⑴在Science上报道了氮替代少量的晶格氧可以使TiO2的带隙变 窄，在不降低紫外光下活性的同时，使TiCh具有可见光活性。在此之后又相继出现C、 B、S、F等非金属元素掺杂可以使TiO2在可见光区出现一定光催化性能的报道 W 还有许多研究学者通过向TiCh晶格中引入金属阳离子Fe、Cu、Al、Zn、Ni、Pt等介初 取代Ti原子位，以降低禁带宽度，将光响应波长拓展到可见光区。其中，
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