Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces and Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, PR China.
Langmuir. 2010 Dec 7;26(23):18570-5. doi: 10.1021/la103191y. Epub 2010 Oct 29.
This manuscript describes the accurate coating of CdS nanoparticles on the surface of colloidal carbon spheres by a facile two-step, microwave-assisted method and the studies on the photocatalytic activity of the C@CdS core-shell spheres. For the coating of CdS nanoparticles, cadmium ions were incorporated into the hydrophilic shell of colloidal carbon spheres and reacted with an introduced sulfur source under a microwave field to obtain the C@CdS hybrid spheres. Using this process, the as-prepared hybrid structures preserved the good dispersity and uniformity of initial carbon spheres, and the thickness of the CdS nanoparticles shell could be varied or controlled by the irradiation time. A photoluminescence spectrum showed that the C@CdS hybrid spheres feature a broad green emission at around 494 nm (λ(ex) = 337 nm). Additionally, CdS nanospheres were successfully prepared in aqueous solution via a microwave-assisted route, and the effect of irradiation time on the products was also investigated. The studies of the photocatalytic property demonstrate that these fabricated functional hybrid structures evinced a higher photocatalytic degradation activity when exposed to visible light irradiation than that of CdS nanospheres under the same conditions.
本文通过简便的两步微波辅助法，精确地在胶体碳球表面包覆 CdS 纳米粒子，并对 C@CdS 核壳球的光催化活性进行了研究。在包覆 CdS 纳米粒子时，将镉离子掺入胶体碳球的亲水壳层中，并在微波场中与引入的硫源反应，得到 C@CdS 杂化球。采用该工艺，所制备的杂化结构保留了初始碳球的良好分散性和均一性，并且 CdS 纳米粒子壳的厚度可以通过辐照时间来改变或控制。光致发光光谱表明，C@CdS 杂化球在 494nm 左右呈现出宽的绿色发射峰（λ(ex) = 337nm）。此外，还通过微波辅助路线在水溶液中成功制备了 CdS 纳米球，并研究了辐照时间对产物的影响。光催化性能研究表明，与相同条件下的 CdS 纳米球相比，这些制备的功能杂化结构在可见光照射下表现出更高的光催化降解活性。
