We, herein, report the synthesis of umbrella-like CdS single crystal with exposed high-activity (002) facets first time by using a one-step hydrothermal method with cadmium acetate dihydrate (Cd(CH3COO)2·2H2O) and ammonium thiocyanate (NH4SCN), and its possible growth mechanism was discussed. As a contrast, CdS nanoparticles with different morphologies were also synthesized. The morphology, composition and photocatalytic property of as-synthesized samples were determined by XRD, SEM, TEM, UV–Vis DRS, PL and photocurrent tests, respectively. The results show that umbrella-like CdS under UV (20 min) and visible light (80 min) irradiation, the removal rate of rhodamine B was as high as 99.1% and 99.3%, respectively. Moreover, even though the particle size of umbrella-like CdS particle is larger than as-synthesized CdS nanospheres, it still shows excellent photocatalytic degradation activity due to its exposed high-energy (002) facets. And its excellent application prospects are conceivable. The current work provides a new paradigm in material morphology design, especially in the construction of highly active surfaces for photocatalysis and photoelectric conversion.

中文翻译：

---

伞状 CdS 单晶：暴露的 (002) 晶面和增强的光催化性能

我们在本文中首次报道了使用一步水热法与乙酸镉二水合物 (Cd(CH3COO)2·2H2O) 和硫氰酸铵合成具有暴露的高活性 (002) 晶面的伞状 CdS 单晶。 NH4SCN)，并讨论了其可能的生长机制。相比之下，还合成了具有不同形态的 CdS 纳米粒子。合成样品的形貌、组成和光催化性能分别通过 XRD、SEM、TEM、UV-Vis DRS、PL 和光电流测试确定。结果表明，伞状CdS在UV（20 min）和可见光（80 min）照射下，对罗丹明B的去除率分别高达99.1%和99.3%。此外，即使伞状 CdS 颗粒的粒径大于合成的 CdS 纳米球，由于其暴露的高能 (002) 面，它仍然显示出优异的光催化降解活性。其优异的应用前景可想而知。目前的工作为材料形态设计提供了新的范例，特别是在构建用于光催化和光电转换的高活性表面方面。