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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Electron-Transfer Dynamics in DTDC/MoS↓(2) and DTDCI/WS↓(2) Nanoclusters
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Electron-Transfer Dynamics in DTDC/MoS↓(2) and DTDCI/WS↓(2) Nanoclusters

机译：DTDC / MoS↓（2）和DTDCI / WS↓（2）纳米团簇中的电子转移动力学

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摘要

The kinetics of forward and reverse electron transfer (ET) between an organic cyanine dye and semiconductor nanoclusters have been studied. The systems studied are MoS↓(2) /DTDCI and WS↓(2)/DTDCI (DTDCI ≡ diethylthiodicarbocyanine iodide). The static spectroscopy of these systems indicates that the dye adsorbs on the nanoclusters as monomers. The vast majority of excited-state dye molecules are quenched by rapid (<10 ps) electron injection in the nanocluster. The reverse ET kinetics are elucidated by time-resolved absorption (bleach recovery) measurements. The results indicate that there are two components of reverse ET that take place on the tens to hundreds of picoseconds and > 10 ns time scales. These components are assigned to reverse ET from shallow (tens to hundreds of picoseconds) and deep (> 10 ns) trap states. The shorter time scale component is nonexponential and is fit with distributed kinetics model, in which the Bohr radius of the trapped electron is about 2.2 nm. This value of the Bohr radius is comparable to that obtained from electron/hole recombination studies.
机译：已经研究了有机花青染料与半导体纳米团簇之间的正向和反向电子转移（ET）的动力学。所研究的系统为MoS↓（2）/ DTDCI和WS↓（2）/ DTDCI（DTDCI≡碘化二乙基硫二杂花青碘）。这些系统的静态光谱表明，染料以单体形式吸附在纳米团簇上。绝大多数的激发态染料分子通过在纳米簇中快速（<10 ps）电子注入而淬灭。通过时间分辨吸收（漂白剂回收）测量可以阐明反向ET动力学。结果表明，反向ET有两个分量，它们发生在几十皮秒到几百皮秒内，并且时间尺度大于10 ns。将这些分量分配为将ET从浅（几十皮秒到几百皮秒）和深（> 10 ns）陷阱状态反转。较短的时间尺度分量是非指数的，并且与分布动力学模型拟合，在该模型中，被俘获电子的玻尔半径约为2.2 nm。玻尔半径的值可与从电子/空穴复合研究获得的值相比。

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