Chemistry Department, University College London, Materials Research Centre, UK.
Dalton Trans. 2011 Feb 28;40(8):1635-40. doi: 10.1039/c0dt00494d. Epub 2010 Dec 23.
N-doped TiO(2) has for many years received interest as visible light photocatalytic materials. Here we give our perspective on the subject with special consideration towards the use of visible light photocatalysts in the field of antimicrobial materials with applications in healthcare environments. The subject is reviewed and critiqued from synthetic techniques to characterisation and assessment of functional properties. N-doped TiO(2) has huge potential to form commercially viable antimicrobial surfaces that are easily implemented within the healthcare environment. We aim to shed light on the illusive nature of the mechanism of the different types of N-doping and comment on how these affect the properties of the catalysts themselves. Small concentrations of nitrogen doped under mild conditions lead to interstitial doping, which also promotes the creation of oxygen vacancies. Many believe that it is these oxygen vacancies that actually promote the formation of visible light photocatalysis and hence there is an indirect correlation between the interstitial doping and the photocatalysis. As the concentration of interstitial nitrogen increases the oxygen vacancies increase, however the presence of oxygen vacancies in turn encourages substitutional doping which then fills the oxygen vacancies. This cyclic relationship leads to photocatalysts that are very sensitive to changing nitrogen concentration.
N 掺杂 TiO(2) 多年来一直作为可见光光催化剂材料受到关注。在这里，我们特别考虑将可见光光催化剂应用于医疗环境中的抗菌材料领域，从合成技术到功能特性的表征和评估，对这一主题进行了综述和评论。N 掺杂 TiO(2) 具有很大的潜力，可以形成具有商业可行性的抗菌表面，并且可以很容易地在医疗环境中实施。我们旨在阐明不同类型 N 掺杂的不明确机制，并评论这些机制如何影响催化剂本身的性质。在温和条件下少量掺杂氮会导致间隙掺杂，这也促进了氧空位的形成。许多人认为，正是这些氧空位实际上促进了可见光光催化的形成，因此，间隙掺杂和光催化之间存在间接相关性。随着间隙氮浓度的增加，氧空位也会增加，然而，氧空位的存在反过来又会鼓励取代掺杂，从而填补氧空位。这种循环关系导致光催化剂对氮浓度的变化非常敏感。
