Department of Physics, Lanzhou University, Lanzhou, People's Republic of China.
Nanotechnology. 2011 Jun 3;22(22):225702. doi: 10.1088/0957-4484/22/22/225702. Epub 2011 Apr 1.
We present the synthesis and visible-light-induced catalytic activity of one-dimensional (1D) TiO(2)/V(2)O(5) branched heterostructures. The 1D TiO(2)/V(2)O(5) heterostructures were prepared by RF reactive magnetron sputtering of V(2)O(5) onto electrospun TiO(2) nanofibers. Then, the samples were annealed at 300 °C for 2 h in air ambient to form the 1D TiO(2)/V(2)O(5) branched heterostructures. The photodecomposition rate of Rhodamine B (RhB) by the 1D TiO(2)/V(2)O(5) branched heterostructures under visible light was much faster than that of pure TiO(2) nanofibers, revealing that the visible-light-induced catalytic activity of the 1D TiO(2)/V(2)O(5) branched heterostructures was greatly improved. The enhancement of the photocatalytic activity of the 1D TiO(2)/V(2)O(5) branched heterostructures can be ascribed to the coupling with a small bandgap semiconductor material V(2)O(5), where the absorption range is extended, the photogenerated electrons and holes are highly separated and the surface charge carrier transfer rate is promoted.
我们提出了一维（1D）TiO2/V2O5 支化异质结构的合成及其可见光诱导催化活性。1D TiO2/V2O5 异质结构是通过射频反应磁控溅射 V2O5 在静电纺丝 TiO2 纳米纤维上制备的。然后，将样品在空气中 300°C 退火 2 小时，形成 1D TiO2/V2O5 支化异质结构。在可见光下，1D TiO2/V2O5 支化异质结构对 Rhodamine B（RhB）的光分解速率比纯 TiO2 纳米纤维快得多，表明 1D TiO2/V2O5 支化异质结构的可见光诱导催化活性得到了极大提高。1D TiO2/V2O5 支化异质结构光催化活性的增强可归因于与带隙较小的半导体材料 V2O5 的耦合，其中吸收范围得到扩展，光生电子和空穴得到高度分离，表面载流子转移速率得到提高。
