Borrowing titania's photoinduced electrons for molecular switching

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2016,（4）
• 页码范围: 420-421
• 页数: 2页
• 语种: 中文
• DOI: 10.1007/s11426-016-5573-4

摘要

When exposed to light,titanium dioxide (titania,TiO2) can act as a powerful catalyst for degrading a variety of organic compounds.Anatase--one of the polymorphs of TiO2—has a band gap of 3.2 eV;exposing it to ultraviolet light causes the formation of electron-hole pairs,which,in the presence of water,can generate hydroxyl radicals—strong oxidizing agents.The photocatalytic behavior of titania has enabled the removal of various chemicals and microbiological impurities from both drinking water and industrial waste water.Whereas the degrading activity of TiO2 has been routinely utilized,with products such as Degussa P25 commercially available,using it for controlled and reversible chemical transformations has remained largely unexplored.Now,in a remarkable piece of work published in Angewandte Chemie,Qu,Tian and co-workers at East China University of Science and Technology demonstrate [1] that lightinduced redox reactions occurring near the TiO2 surface can be employed for constructing novel dual-responsive nanomaterials.