Electron transfer dynamics from single near infrared emitting lead sulfide–cadmium sulfide nanocrystals to titanium dioxide,Nanoscale

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Electron transfer dynamics from single near infrared emitting lead sulfide–cadmium sulfide nanocrystals to titanium dioxide
Nanoscale ( IF 5.8 ) Pub Date : 2017-08-25 00:00:00 , DOI: 10.1039/c7nr03500d
Huidong Zang _{1,

2,

3} , Prahlad K. Routh _{1,

2,

3,

4,

5} , Qingping Meng _{2,

3,

6} , Mircea Cotlet _{1,

2,

3,

4,

5}

Affiliation

In this study we report the first successful demonstration of electron transfer between single near infrared emitting PbS/CdS nanocrystals and an external acceptor, titanium dioxide (TiO₂). We demonstrate distance-dependent electron transfer from single nanocrystals to TiO₂ and explore the effect of this process on the photoluminescence dynamics of these nanocrystals. Isolated PbS/CdS QDs are found to exhibit blinking dynamics similar to other nanocrystals like CdSe/ZnS; however, their photoluminescence follows a quasi two-state pattern with heterogeneous photoluminescence lifetimes which may be the result of their emission originating from different energy states. Electron transfer of these nanocrystals with an external acceptor inhibits their photoluminescence lifetime heterogeneity and biases their blinking dynamics in a manner similar to that observed for visible emitting CdSe/ZnS nanocrystals undergoing electron transfer with external acceptors. While the present study reconfirms the universality of quantum dot blinking among various types of nanocrystals, it also demonstrates that universality remains valid for the communication of various types of nanocrystals with the exterior world, here pictured as electron transfer with external acceptors.

中文翻译：

从单个近红外发射硫化铅-硫化镉纳米晶体到二氧化钛的电子转移动力学

在这项研究中，我们报告了单个近红外发射PbS / CdS纳米晶体与外部受体二氧化钛（TiO ₂）之间电子转移的首次成功演示。我们证明了从单纳米晶体到TiO _2的距离依赖的电子转移并探索该过程对这些纳米晶体的光致发光动力学的影响。发现隔离的PbS / CdS QD表现出与CdSe / ZnS等其他纳米晶体相似的闪烁动力学。然而，它们的光致发光遵循具有异质光致发光寿命的准两态模式，这可能是由于它们的发射来自不同的能量态造成的。这些纳米晶体与外部受体的电子转移抑制了它们的光致发光寿命异质性，并以类似于观察到的可见CdSe / ZnS纳米晶体通过外部受体进行电子转移的方式偏向它们的闪烁动力学。尽管本研究证实了各种类型的纳米晶体之间量子点闪烁的普遍性，

更新日期：2017-09-22

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