New layered materials containing Ti and Nb and their unique properties

层状氧化物材料具有许多独特的性质，如高效的水分解、超导、电化学插层等。Ti和Nb层状氧化物在溶液中可以剥离成纳米片。我们已经开发出一些有趣的层状材料可以很容易地通过混合纳米片和大尺寸的阳离子在溶液中制备。这种技术被称为ESD（静电自组装沉积）方法。本课题主要采用静电放电法制备了一些新型的含Ti或Nb的层状氧化物，其独特的性能表现在以下几个方面：1.银插层氧化物的独特电化学性能银插层层状氧化物表现出强烈的氧化还原反应，其中Ag原子/ Ag+离子的电化学反应发生在层间空间。这种独特而简单的电化学反应发生在穿过主体层的隧穿电子交换以及中间层中的质子迁移。 ...更多信息 可见光下的分解由于钌配合物在可见光下起作用，因此，嵌入钌配合物的层状氧化物在可见光下起光催化剂的作用。钌配合物在中间层中的固定是实际应用所必需的。3.铌纳米片在含醇溶液中的高光电流与其他纳米片相比，在铌基质氧化物的单纳米片上观察到由于醇氧化而产生的高光电流。其主要原因是基于主体纳米片中空穴和电子的非复合。Nb基质纳米片的导带边能量较高也是其原因之一。4.镧系阳离子插层的层状氧化物的光致发光Eu阳离子插层的Ti层状氧化物表现出较高的光致发光强度。水分子与Eu阳离子一起嵌入促进了发光，这是由于能量从主体层转移到Eu。这是基于夹层中的水分子的特殊键合状态，就像冰一样。少

Layered oxide materials have many unique properties such as photocatalysis of water split with high efficiency, superconduction, and electrochemical intercalation, etc. Ti and Nb layered oxides can be exfoliated to host nano-sheet in solution. We have developed that some interesting layered materials can be easily prepared by mixing nano-sheets and cations with large size in solution. This technique is called to ESD (Electrostatic Self-assembly Deposition) method. In this project, some new layered oxides containing Ti or Nb are prepared mainly by ESD method, and their unique properties are demonstrated as follows.1.Unique electrochemical properties of Ag intercalated oxidesLayered oxides intercalated with Ag showed sharp redox reaction where electrochemical reaction of Ag atom/ Ag+ ion occurs in the interlayer space. This unique and simple electrochemical reaction occurs with tunneling electron exchange through the host layer together with proton migration in the interlayer.2.Photocata … More ysis under visible light illuminationLayered oxides intercalated with Ru complex were acted as photocatalyst under visible light illumination, because the Ru complex acts under visible light illumination. Fixation of Ru complex in the interlayer is necessary for practical use.3.High photocurrent at Nb nano-sheet in solution containing alcoholHigh photocurrent due to alcohol oxidation was observed on mono-nano-sheet of Nb host oxide compared with other nano-sheet. The main reason is based on the non-recombination of hole and electron in the host nano-sheet. High energy position of the conduction band edge of Nb host nano-sheet compared with other nano-sheet is also another reason.4.Photoluminescence of layered oxides intercalated with lanthanide cationsTi layered oxide intercalated with Eu cation showed photoluminescence with high intensity. Water molecules intercalated together with Eu cation promotes the emission due to energy transfer from host layer to Eu. This is based on special bonding state of intercalated water molecules in the interlayer like in ice. Less