金从内核向 Ag(2)S 纳米晶体表面的扩散。

Diffusion of gold from the inner core to the surface of Ag(2)S nanocrystals.

机构信息

Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos, Singapore 138669.

出版信息

J Am Chem Soc. 2010 Feb 24;132(7):2114-5. doi: 10.1021/ja909078p.

PMID:20121103

Abstract

The diffusion of Au in Ag(2)S from the inner core to the surface of Ag(2)S was reported, and a new nanocomposite of core-shell Pt@Ag(2)S and Au nanoparticles has been derived through this diffusion phenomenon. Ostwald ripening was observed by transmission electron microscopy during the characterization of the nanocomposite. This elucidated the mechanism of formation of semiconductor-metal heterostructures as a consequence of Au diffusion in Ag(2)S nanocrystals.

摘要

报道了 Au 在 Ag(2)S 从内芯到 Ag(2)S 表面的扩散，并通过这种扩散现象得到了核壳结构的 Pt@Ag(2)S 和 Au 纳米粒子的新型纳米复合材料。在对纳米复合材料进行表征时，通过透射电子显微镜观察到奥斯特瓦尔德熟化现象。这阐明了 Au 在 Ag(2)S 纳米晶中扩散导致半导体-金属异质结构形成的机制。