论文标题
关于培养酶LA掺杂TIO2纳米植物的处理：结构相变和表面缺陷工程
On the processing of anatase La-doped TiO2 nanopowders: structural phase transition and surface defect engineering
论文作者
论文摘要
与TiO2纳米颗粒的光催化效率相关的物理和化学特性优化的努力主要依赖于缺陷工程策略，这是结构性和掺杂最常见的策略。具有灯笼元素的氧化酶TiO2结构的掺杂可能会使TiO2光学吸收变为可见范围，从而大大增加了其光催化效率。在这里，我们表明在氧气和LA掺杂稳定促进酶相中的TIO2纳米颗粒的加工可以稳定。与未掺杂的TIO2相比，LA掺入主要发生在导致小纳米颗粒的纳米颗粒表面上。尽管有有效的LA掺杂，但能量带隙的减少是通过与纳米颗粒尺寸减小有关的量子限制效应来补偿的。但是，LA3+离子在纳米颗粒表面的位置诱导局部氧气空位浓度，从而提高系统的量子效率，从而导致较高的光催化活性。
The efforts in the optimization of the physical and chemical properties related to the photocatalytic efficiency of TiO2 nanoparticles relies mainly on defect engineering strategies, been the structural and the doping the most common ones. The doping of the anatase TiO2 structure with lanthanides elements potentially can turns the TiO2 optical absorption into the visible range increasing drastically its photocatalytic efficiency. Here we show that the processing of TiO2 nanoparticles in oxygen atmosphere and the La doping stabilizes the anatase phase. The La incorporation takes place mainly in the surface of the nanoparticles leading to small nanoparticles as compared to the undoped TiO2. In spite of the effective La doping, the decrease of the energy bandgap is compensated by a quantum confinement effect related to the decrease in the nanoparticle size. However, the location of the La3+ ions on the surface of the nanoparticles induces a local concentration of oxygen vacancies that can increase the quantum efficiency of the system leading to higher photocatalytic activity.
