Segmented CdSe@CdS/ZnS Nanorods Synthesized via a Partial Ion Exchange Sequence
Segmented CdSe@CdS/ZnS Nanorods Synthesized via a Partial Ion Exchange Sequence
复制标题
DOI：
10.1021/cm500431m
复制
发表时间：
2014-05-27
影响因子：
8.6
通讯作者：
Dorfs, Dirk
中科院分区：
文献类型：
--
作者：
Adel, Patrick;Wolf, Andreas;Dorfs, Dirk
在这篇通讯中，我们提出了一种合成方法，它以一种分段的方式构建(一个嵌入在CDS棒中的CDSe核，然后外延结束在一个ZnS棒中)。这种结构是利用顺序阳离子交换机制实现的。在第一步中，将CdSe@CDS棒转化为CdSe@CDS/Cu2-XS棒。在第二步中，后者被转化为CdSe@CDS/ZnS棒。通过改变Cd~(2+)到Cu~+离子交换步骤中切割前驱体的量，可以控制地移位Cd~(2+)和Zn~(2+)之间的相界。这一发现很好地证明了纳米晶体中的阳离子交换反应不仅可以用来交换完整的阳离子晶格，还可以用来交换特定的部分阳离子晶格。对得到的CdSe@CDS/ZnS纳米棒进行了深入的光学和电子显微镜表征。
In this communication we present a synthetic pathway toward CdSe@CdS/ZnS nanorods which are built in a segment like manner (a CdSe core which is embedded in a CdS rod which then epitaxially ends in a ZnS rod). This structure is realized exploiting a sequential cation exchange mechanism. In a first step, CdSe@CdS rods are transformed into CdSe@CdS/Cu2-xS rods. In a second step, the latter ones are converted into CdSe@CdS/ZnS rods. By varying the amount of Cut precursor in the Cd2+ to Cu+ ion exchange step, the phase boundary between CdS and ZnS can be shifted in a controlled manner. This finding nicely demonstrates that cation exchange reactions in nanocrystals can not only be used to exchange the complete cation lattice but also only specifically selected parts of it. The obtained CdSe@CdS/ZnS nanorods are optically and electron microscopically characterized in depth.