物理化学学报 >> 2012, Vol. 28 >> Issue (10): 2487-2492.doi: 10.3866/PKU.WHXB201209031

材料物理化学 上一篇    下一篇

反应性模板法合成硫化银中空球-银纳米粒子异质结构

高继宁, 赵华博, 齐利民   

  1. 北京大学化学与分子工程学院, 分子动态与稳态结构国家重点实验室, 北京分子科学国家实验室, 北京 100871
  • 收稿日期:2012-07-17 修回日期:2012-09-03 发布日期:2012-09-26
  • 通讯作者: 齐利民 E-mail:liminqi@pku.edu.cn
  • 基金资助:

    国家自然科学基金(21173010, 21073005, 51121091)资助项目

Synthesis of Silver Sulfide Hollow Sphere-Silver Nanoparticle Heterostructures Based on Reactive Templates

GAO Ji-Ning, ZHAO Hua-Bo, QI Li-Min   

  1. Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2012-07-17 Revised:2012-09-03 Published:2012-09-26
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21173010, 21073005, 51121091).

摘要:

以Cu2S中空球为反应性模板, 通过在水溶液中与银离子的阳离子交换和氧化还原反应制备了大小均匀的Ag2S中空球-Ag纳米粒子异质结构, 即Ag2S-Ag异质中空球. 该异质结构中每个Ag2S中空球的直径约为600 nm, 壁厚约20–30 nm, 其表面均附着一个Ag纳米粒子. 采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射(XRD)和能量色散X射线谱(EDS)对所得Ag2S-Ag异质中空球的结构和组成进行了表征. 若以CuS中空球为反应性模板, 在相似转化条件下则主要得到不含Ag粒子的Ag2S中空球. 该结果表明, Cu2S中的Cu(I)的还原性在Ag2S-Ag异质中空球的形成中发挥了重要作用. 通过对所制备的Ag2S-Ag异质中空球进行二次生长, 还可以得到Ag2S中空球的半球表面均被Ag膜所包覆的Ag2S-Ag异质中空球.

关键词: 硫化银, 中空球, 银纳米粒子, 异质结构, 反应性模板, 化学转化, 硫化亚铜

Abstract:

Silver sulfide hollow sphere-silver nanoparticle heterostructures were prepared by the simultaneous cation exchange and oxidation-reduction reactions of Cu2S hollow spheres with Ag+ ions in aqueous solution. The obtained Ag2S-Ag hybrid hollow spheres consisted of Ag2S hollow spheres about 600 nm in diameter and 20-30 nm in thickness with a single Ag nanoparticle attached to the outer surface of each Ag2S hollow sphere. The products were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and energy dispersive X-ray spectroscopy (EDS). When CuS hollow spheres were used as the reactive template instead of Cu2S hollow spheres, Ag2S hollow spheres were the predominant product under similar reaction conditions, indicating that the Cu(I) in the Cu2S hollow spheres served as a reductant for reducing Ag+ ions to metallic Ag, and hence played a key role in the formation of the Ag2S-Ag hybrid hollow spheres. Furthermore, secondary deposition of Ag on the Ag2S-Ag hybrid hollow spheres resulted in the formation of larger Ag2S-Ag hybrid hollow spheres consisting of Ag2S hollow spheres with around a half of the surface coated by a Ag film.

Key words: Silver sulfide, Hollow sphere, Silver nanoparticle, Heterostructure, Reactive template, Chemical transformation, Cuprous sulfide

MSC2000: 

  • O648