Synthesis of Au-CdS Core-Shell Hetero-Nanorods with Efficient Exciton-Plasmon Interactions
Synthesis of Au-CdS Core-Shell Hetero-Nanorods with Efficient Exciton-Plasmon Interactions
复制标题
具有高效激子-等离子体相互作用的 Au-CdS 核壳异质纳米棒的合成
DOI：
10.1002/adfm.201002233
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发表时间：
2011-05-24
影响因子：
19
通讯作者：
Wang, Qu-Quan
中科院分区：
文献类型：
--
作者：
Li, Min;Yu, Xue-Feng;Wang, Qu-Quan
大晶格失配金属-半导体核壳结构异质纳米结构的合成仍然具有挑战性，因此很少讨论相应的光学性质。本文报道了以Ag(2)-S为过渡层的Au-CDS核-壳异质纳米棒的金纳米籽晶生长，这种过渡层有利于通过阳离子交换过程形成Cd S壳，随后的Cd S生长可以形成壳层厚度可控的完整的核-壳结构。在Au-CDS纳米棒中观察到的激子-等离子体相互作用诱导了壳层厚度定制和红移的纵向表面等离子体共振，并在紫外光激发下猝灭了CDS发光。此外，金-硫化镉纳米棒在近红外脉冲激光激发下表现出增强的、受等离子体控制的双光子发光。这种方法有可能制备其他具有完整核-壳结构的金属-半导体异质纳米材料，这些金-镉纳米棒可能在光学和电子学的界面上开辟有趣的新可能性。
The synthesis of large lattice mismatch metal-semiconductor core-shell hetero-nanostructures remains challenging, and thus the corresponding optical properties are seldom discussed. Here, we report the gold-nanorod-seeded growth of Au-CdS core-shell hetero-nanorods by employing Ag(2)S as an interim layer that favors CdS shell formation through a cation-exchange process, and the subsequent CdS growth, which can form complete core-shell structures with controllable shell thickness. Exciton-plasmon interactions observed in the Au-CdS nanorods induce shell thickness-tailored and red-shifted longitudinal surface plasmon resonance and quenched CdS luminescence under ultraviolet light excitation. Furthermore, the Au-CdS nanorods demonstrate an enhanced and plasmon-governed two-photon luminescence under near-infrared pulsed laser excitation. The approach has potential for the preparation of other metal-semiconductor hetero-nanomaterials with complete core-shell structures, and these Au-CdS nanorods may open up intriguing new possibilities at the interface of optics and electronics.