具有棒状和四足形态的高发光 CdSe/CdS 纳米异质结构的种子生长。

Seeded growth of highly luminescent CdSe/CdS nanoheterostructures with rod and tetrapod morphologies.

作者信息

Talapin Dmitri V, Nelson James H, Shevchenko Elena V, Aloni Shaul, Sadtler Bryce, Alivisatos A Paul

机构信息

The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.

出版信息

Nano Lett. 2007 Oct;7(10):2951-9. doi: 10.1021/nl072003g. Epub 2007 Sep 11.

DOI:10.1021/nl072003g

PMID:17845068

Abstract

We have demonstrated that seeded growth of nanocrystals offers a convenient way to design nanoheterostructures with complex shapes and morphologies by changing the crystalline structure of the seed. By using CdSe nanocrystals with wurtzite and zinc blende structure as seeds for growth of CdS nanorods, we synthesized CdSe/CdS heterostructure nanorods and nanotetrapods, respectively. Both of these structures showed excellent luminescent properties, combining high photoluminescence efficiency (approximately 80 and approximately 50% for nanorods and nanotetrapods, correspondingly), giant extinction coefficients (approximately 2 x 10(7) and approximately 1.5 x 10(8) M(-1) cm(-1) at 350 nm for nanorods and nanotetrapods, correspondingly), and efficient energy transfer from the CdS arms into the emitting CdSe core.

摘要

我们已经证明，通过改变种子的晶体结构，纳米晶体的种子生长为设计具有复杂形状和形态的纳米异质结构提供了一种便捷的方法。通过使用具有纤锌矿和闪锌矿结构的CdSe纳米晶体作为CdS纳米棒生长的种子，我们分别合成了CdSe/CdS异质结构纳米棒和纳米四脚架。这两种结构均表现出优异的发光性能，兼具高光致发光效率（纳米棒和纳米四脚架分别约为80%和约50%）、巨大的消光系数（纳米棒和纳米四脚架在350 nm处分别约为2×10⁷和约1.5×10⁸ M⁻¹ cm⁻¹）以及从CdS臂到发光CdSe核的高效能量转移。