Long-range energy transfer in self-assembled quantum dot-DNA cascades.
Long-range energy transfer in self-assembled quantum dot-DNA cascades.
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DOI：
10.1039/c5nr04778a
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发表时间：
2015-11
期刊：
影响因子：
6.7
通讯作者：
Samuel M Goodman;A. Siu;Vivek Singh;P. Nagpal
中科院分区：
文献类型：
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作者：
Samuel M Goodman;A. Siu;Vivek Singh;P. Nagpal
半导体纳米晶体或量子点（QD）的尺寸依赖的能带隙可以用于通过不同尺寸的量子点的层之间的级联能量转移（ET），随后是底层中的电荷解离和输运，将宽带入射辐射有效地转换为电流。具有埃级空间精度的自组装这样的级联结构对于构建现实的器件是重要的，并且基于DNA的QD自组装可以提供重要的替代方案。在这里，我们展示了在QD-DNA自组装的单一结构和合奏设备的远程德克斯特能量转移。利用光致发光、扫描隧道光谱、单个QD-DNA级联结构中的电流传感原子力显微镜测量以及使用TiO 2纳米管的温度依赖性系综装置，我们表明Dexter能量转移可能由这些QD-DNA自组装结构中形成的激子架介导，可以用于跨QD-DNA薄膜的能量高效传输。
The size-dependent energy bandgaps of semiconductor nanocrystals or quantum dots (QDs) can be utilized in converting broadband incident radiation efficiently into electric current by cascade energy transfer (ET) between layers of different sized quantum dots, followed by charge dissociation and transport in the bottom layer. Self-assembling such cascade structures with angstrom-scale spatial precision is important for building realistic devices, and DNA-based QD self-assembly can provide an important alternative. Here we show long-range Dexter energy transfer in QD-DNA self-assembled single constructs and ensemble devices. Using photoluminescence, scanning tunneling spectroscopy, current-sensing AFM measurements in single QD-DNA cascade constructs, and temperature-dependent ensemble devices using TiO2 nanotubes, we show that Dexter energy transfer, likely mediated by the exciton-shelves formed in these QD-DNA self-assembled structures, can be used for efficient transport of energy across QD-DNA thin films.