Hydrothermal Synthesis of CdS Nanorods in NaOH Solution and their photocatalytic properties

CdS是一种重要的Ⅱ-Ⅵ族半导体材料，室温下其禁带宽度为2.42eV，表现出良好的光学性质和光电特性，被广泛应用于光、电、磁、催化等领域。众多形貌的CdS纳米材料中，纳米线、纳米棒、纳米管等一维纳米材料因在纳米器件、太阳能电池、光催化方面具有巨大的应用潜力而备受关注，其控制合成也成为研究热点。作为一种可见光光催化剂，一维CdS纳米材料的光催化活性和光稳定性还有待于进一步提高，寻找适当的方法来改善其光催化性能是该领域的一项重要研究内容。 本文对NaOH溶液介质中水热合成CdS纳米棒进行了系统的研究，探讨了多种反应条件对一维CdS纳米棒形貌和晶体结构的影响，提出了可能的生长机理，为一维CdS纳米...As an important II-VI group semiconductor with a narrow band gap of 2.42 eV , CdS exhibits good optical and optoelectronic properties, and is widely used in optics, electricity, magnetism and catalysis. Among various CdS nanomaterials, one dimensional (1D) CdS nanomaterials, such as nanowires, nanorods, nanotubes, have attracted much attention due to their huge potential applications in nanodevice...学位：理学硕士院系专业：化学化工学院_分析化学学号：2052009115132

Hydrothermal Synthesis of CdS Nanorods in NaOH Solution

【中文摘要】在NaOH溶液中水热合成了CdS纳米棒,并探讨了NaOH溶液浓度和反应时间对CdS纳米棒形貌及晶体结构的影响及其可能的生长机理和母液循环可行性。用粉末X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、高分辨透射电子显微镜(HRTEM)和选区电子衍射SAED)对CdS纳米棒进行了表征,并考察了其在可见光照射下光催化降解亚甲基蓝的活性。结果表明,NaOH溶液是形成棒状形貌的关键因素。在最优实验条件下,可获得六方纤锌矿结构CdS纳米棒,直径约200 nm,长度可达4μm. 该纳米棒具有良好的可见光光催化活性.【Abstract】CdS nanorods were synthesized via a hydrothermal route in NaOH solution. and characterized by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED). The influences of NaOH concentration and hydrothermal time on morphology and crystalline structure of CdS nanorods were studied, and a probable growth mechanism was proposed. The feasibility of recycling of mother liquor was also investigated. The visible light photocatalytic activity of CdS nanorods was evaluated by photocatalytic degradation of methylene blue(MB). The experimental results showed that NaOH solution played a role of complexing agent in the growth of CdS nanorods and was the key factor in the formation of rod-like morphology. The sample obtained in optimal experimental condition was CdS nanorod with an average diameter of ca. 200 nm and a length up to ca. 4 pm. The CdS nanorods were hexagonal single-crystals with high crystallinity growing along the [001] direction, and showed good photocatalytic activity and stability under visible light.国家自然科学基金(批准号: 20835005, 21075101)和厦门市科技计划项目(批准号: 3502z20113006)资助