State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
J Am Chem Soc. 2011 Jan 12;133(1):148-57. doi: 10.1021/ja1090996. Epub 2010 Dec 8.
We demonstrate that Ag(2)S nanocrystals are the bifunctional mediator for controllable growth of semiconductor heterostructures including more complicated multisegments heterostructures in solution-phase, which is a new type of nanomediator and quite different from the metal nanoparticle catalyst. The intrinsic high Ag(+) ion mobility makes Ag(2)S nanocrystals not only exhibit excellent catalytic function for growth of metal sulfide heterostructures but also act as a source-host for growth of ternary semiconductor heterostructures, for example, Ag(2)S-AgInS(2). The semiconductors grow epitaxially from or inward in Ag(2)S nanocrystals forming single-crystalline heterostructures. Moreover, the method developed here also can construct multisegments heterostructures, for example, Ag(2)S-CdS-ZnS, AgInS(2)-Ag(2)S-AgInS(2). The interfacial structure is still stable even if the lattice mismatch is quite large, which is a unique feature of this method.
我们证明了 Ag(2)S 纳米晶是半导体异质结构可控生长的双功能介体，包括在溶液相中更复杂的多段异质结构，这是一种新型的纳米介体，与金属纳米颗粒催化剂有很大的不同。Ag(2)S 纳米晶的固有高 Ag(+)离子迁移率不仅使其表现出优异的催化功能，用于生长金属硫化物异质结构，而且还可以作为三元半导体异质结构，例如 Ag(2)S-AgInS(2)的源-宿主。半导体从 Ag(2)S 纳米晶外延或向内生长，形成单晶异质结构。此外，这里开发的方法还可以构建多段异质结构，例如 Ag(2)S-CdS-ZnS、AgInS(2)-Ag(2)S-AgInS(2)。即使晶格失配很大，界面结构仍然稳定，这是该方法的独特特征。
