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摘要：二氧化钛以稳定、低毒、高效等优点而做为光催化剂被广泛研究。尤其纳米二氧化钛，具有比表面积大、光催化、吸收紫外能力强等诸多特性。另一方面，不同形貌二氧化钛纳米材料的光催化性能大不相同。如二氧化钛纳米管，其具有长径比的管状结构，使其能够提供更大的表面积。而与分散的二氧化钛纳米管相比，二氧化钛管阵列中有序的管状结构，对其电子-空穴对的分离更为有利，电子传输更加高效，从而展现出更高的光催化性能和光电转化效率。近年来，越来越多的方法被用来制备二氧化钛纳米阵列。其中使用阳极氧化法来制备二氧化钛纳米管阵列是常见的方法。其基底材料也由最初的二文金属平面，发展为导电玻璃、软性材料、网状材料等其它适应面更广、性能更佳的基底材料。27767
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同时，由于二氧化钛纳米阵列只对紫外光有吸收，光电转化效率也有提高的必要，对二氧化钛纳米阵列进行修饰也是非常必要的，如使用不同金属修饰二氧化钛管阵列。而特定形貌的二氧化钛-金属结构，比如同轴结构，可能使光催化剂的性能进一步提高。
本文以电化学法和种子生长法联用，在钛网上制备了二氧化钛-银同轴纳米阵列，并表征其紫外-可见吸收。在这一过程中，晶种的引入必不可少。所得材料在紫外-可见区有很宽的吸收，具有一定的应用潜力。
毕业论文关键词： 二氧化钛；阳极氧化；金属负载；同轴结构
Preparation of the coaxial TiO2-Metal Nano Arrays
Abstract: titanium dioxide is widely studied as a photocatalyst for stable, low toxicity and high efficiency.. In particular, nano titanium dioxide has many properties, such as large specific surface area, photocatalysis, absorption ultraviolet, and so on.. On the other hand, the photocatalytic properties of TiO2 nanomaterials with different morphologies are different.. Such as titania nanotube, which has a long diameter ratio of tubular structure, so that it can provide a greater surface area. And compared with the dispersion of TiO2 nanotubes, TiO2 tube array orderly tubular structure, the electron hole separation more favorable, electronic transmission more efficient, thus showing higher photocatalytic activity and photoelectric conversion efficiency. In recent years, more and more methods are being used to prepare TiO2 nanoparticles array. The preparation of titania nanotube arrays by anodic oxidation is a common method.. The basement material is also the original two-dimensional metal plane, which is the basement material for the electric glass, soft material, mesh material, etc..
At the same time, due to the titanium dioxide nano array only on the UV absorption, photoelectric conversion efficiency is also necessary to improve, of titanium dioxide nano array modified is also very necessary, such as the use of different metal modified titanium dioxide tube array. And the specific morphology of the titanium dioxide - metal structure, such as coaxial structure, may make the performance of photocatalyst further improve.
In this paper, titanium dioxide - Silver coaxial nano arrays were prepared by electrochemical method and seed growth method, and characterized by UV - visible absorption.. In this process, the introduction of crystal seed is essential. The material has a broad absorption in the ultraviolet visible region, and has a certain application potential..
Keywords: titanium dioxide; anodic oxidation; metal load; coaxial structure
目录
1前言 1
1.1 二氧化钛纳米阵列的制备方法 1
1.1.1 水热法制备TiO2纳米阵列 1
1.1.2模版法制备TiO2纳米阵列 2
1.1.3阳极氧化法制备TiO2纳米阵列 2
1.2二氧化钛纳米阵列的修饰 3