Manipulating Coupling between a Single Semiconductor Quantum Dot and Single Gold Nanoparticle
Manipulating Coupling between a Single Semiconductor Quantum Dot and Single Gold Nanoparticle
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DOI：
10.1021/nl103906f
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发表时间：
2011-03-01
期刊：
影响因子：
10.8
通讯作者：
Li, Xiaoqin
中科院分区：
文献类型：
--
作者：
Ratchford, Daniel;Shafiei, Farbod;Li, Xiaoqin
利用原子力显微镜纳米操纵技术，我们将单个Au纳米颗粒放置在一个CdSe/ZnS量子点附近，构建了一种几何形状可变的杂化纳米结构。这两个粒子之间的耦合是以系统和可逆的方式变化的。对组装前后同一量子点的光致发光寿命和闪烁进行了测量。在一些混合结构中，总寿命从大约30 ns减少到远低于1 ns。这种寿命的急剧变化伴随着闪烁的消失，因为从CdSe/ZnS量子点到Au纳米粒子的非辐射能量转移成为主要的衰减通道。总寿命和光致发光强度的变化都可以通过简单的解析计算得到很好的描述。
Using atomic force microscopy nanomanipulation, we position a single Au nanoparticle near a CdSe/ZnS quantum dot to construct a hybrid nanostructure with variable geometry. The coupling between the two particles is varied in a systematic and reversible manner. The photoluminescence lifetime and blinking of the same quantum dot are measured before and after assembly of the structure. In some hybrid structures, the total lifetime is reduced from about 30 ns to well below 1 ns. This dramatic change in lifetime is accompanied by the disappearance of blinking as the nonradiative energy transfer from the CdSe/ZnS quantum dot to the Au nanoparticle becomes the dominant decay channel. Both total lifetime and photoluminescence intensity changes are well described by simple analytical calculations.