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首页> 外文学位 >Effect of doping on the photocatalytic, electronic and mechanical properties of sol-gel titanium dioxide films.
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Effect of doping on the photocatalytic, electronic and mechanical properties of sol-gel titanium dioxide films.

机译：掺杂对溶胶-凝胶二氧化钛薄膜的光催化，电子和机械性能的影响。

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摘要

Heterogeneous photocatalysis has been an active research area over the last decade as a promising solution for energy generation and environmental problems which has led to promising applications from air and water purification systems, self-cleaning and self-sterilizing surfaces to solar cells and hydrogen production from water dissociation reaction. Titanium dioxide (TiO2), an abundant material with a high photocatalytic efficiency and chemical stability, is undoubtedly the most widely studied and used among all photocatalytic materials. Although titanium dioxide has been used in powder form, its immobilized form (film) is necessary from practical application standpoint. However, there are several shortcomings of titanium dioxide films that need to be addressed to realize a wide range of successful applications: lack of visible light activity, poisoning of the catalytic performance by the substrate and the low surface area compared to powder forms. In addition, mechanical properties of such films have not been investigated thoroughly, which may be critical when abrasion and weathering resistance are necessary. To address each of these issues, a systematic experimental and theoretical investigation of doping titanium dioxide films with a variety of elements were conducted. Utilizing theoretical calculations to filter elements for experimental studies as well as interpretation of the experimental results, several dopant or dopant combinations were found to remedy some of the issues of photocatalytic titanium dioxide films.;Doping with 32 metals, nitrogen and 11 metal-nitrogen combinations are investigated theoretically and the results are used as guideline for the experimental studies. Particular attention is given to certain metal dopants such as Cr, V, Mo, Ta and Ga not just because of their relatively modest cost but also their non-toxicity and wide availability of their compatible compounds for sol-gel synthesis. While metal-dopants improved the overall efficiency and mechanical properties of titanium dioxide films, visible light activity is only achieved with nitrogen and metal-nitrogen doping where some of the metal co-dopants significantly improved the overall photocatalytic efficiency compared to nitrogen-only doped films.;In addition, majority of the experimental studies is accompanied by nanoindentation technique to study the effect of doping and calcination on the key mechanical properties of titanium dioxide films. It is shown that good mechanical properties---good photocatalytic activity combinations can be achieved by a choice of appropriate dopant---dopant combinations and coupled with appropriate calcination parameters.;Results of the theoretical and experimental investigations led to the development of first commercial photocatalytic tableware glass items which can be utilized under indoor lighting conditions by carefully selecting metal-nitrogen couples for doping of titanium dioxide films.
机译：在过去的十年中，非均相光催化一直是一个活跃的研究领域，它是解决能源产生和环境问题的有前途的解决方案，已导致空气和水净化系统，自清洁和自消毒表面到太阳能电池以及氢气生产中的氢的有前景的应用。水离解反应。二氧化钛（TiO2）是一种具有高光催化效率和化学稳定性的丰富材料，无疑是所有光催化材料中应用最广泛的研究和使用。尽管二氧化钛已经以粉末形式使用，但是从实际应用的观点来看，其固定形式（膜）是必需的。但是，要实现广泛的成功应用，需要解决二氧化钛薄膜的几个缺点：与粉末形式相比，缺乏可见光活性，底物对催化性能的毒害以及表面积低。另外，还没有对这种膜的机械性能进行彻底的研究，当需要耐磨性和耐候性时，这可能是至关重要的。为了解决这些问题中的每一个，进行了用各种元素掺杂二氧化钛膜的系统的实验和理论研究。利用理论计算对滤光片进行实验研究以及对实验结果的解释，发现了几种掺杂剂或掺杂剂组合可解决光催化二氧化钛薄膜的某些问题。掺杂32种金属，氮和11种金属-氮组合从理论上进行研究，并将结果用作实验研究的指导。特别注意某些金属掺杂剂，例如Cr，V，Mo，Ta和Ga，不仅因为它们的成本相对适中，还因为它们的无毒性以及可兼容化合物在溶胶-凝胶合成中的广泛应用。尽管金属掺杂剂改善了二氧化钛薄膜的总体效率和机械性能，但可见光活性仅通过氮和金属氮掺杂才能实现，其中某些金属共掺杂剂与仅掺杂氮的薄膜相比显着提高了总体光催化效率此外，大多数实验研究都伴随着纳米压痕技术，以研究掺杂和煅烧对二氧化钛薄膜关键机械性能的影响。结果表明，通过选择合适的掺杂剂---掺杂剂组合并结合合适的煅烧参数可以实现良好的机械性能-良好的光催化活性组合;理论和实验研究的结果促成了第一批工业化产品的开发。通过仔细选择用于掺杂二氧化钛薄膜的金属氮对，可以在室内照明条件下使用的光催化餐具玻璃物品。

著录项

  • 作者

    Kurtoglu, Murat.;

  • 作者单位

    Drexel University.;

  • 授予单位 Drexel University.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 193 p.
  • 总页数 193
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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