Instituto de Física, Benemérita Universidad Autónoma de Puebla, Apdo. Postal J-48, Puebla, Pue. 72570, Mexico.
ACS Appl Mater Interfaces. 2012 Sep 26;4(9):4807-16. doi: 10.1021/am301155u. Epub 2012 Sep 13.
ZnO nanorods decorated with gold nanoparticles of ~20 nm average size were fabricated by microwave-assisted chemical synthesis. For the surface-attached growth of metal nanoparticles, the ZnO nanostructures were first functionalized by sodium citrate and then the metal ions were reduced under microwave heating. While the incorporation of gold nanoparticles at the surface seen to quench both the band edge and visible emissions of the ZnO nanostructures, it enhances the degradation rate of Rhodamine 6G up to 3 folds under UV emission. The mechanisms of citrate functionalization, growth of Au nanoparticles on the surface of the oxide nanostructures, luminescence emission quenching, and enhanced photocatalytic activity of the composite nanostructures have been discussed.
采用微波辅助化学合成法制备了平均尺寸约为 20nm 的金纳米粒子修饰的氧化锌纳米棒。为了实现金属纳米粒子的表面附着生长，首先通过柠檬酸钠对 ZnO 纳米结构进行功能化，然后在微波加热下还原金属离子。尽管金纳米粒子的掺入似乎猝灭了 ZnO 纳米结构的带边和可见发射，但它在紫外发射下将罗丹明 6G 的降解速率提高了 3 倍。讨论了柠檬酸盐功能化、氧化物纳米结构表面上 Au 纳米粒子的生长、发光发射猝灭以及复合纳米结构的增强光催化活性的机制。
