Optical-Gain-based Sensing Using Inorganic-Ligand-Passivated Colloidal Quantum Dots,Nano Letters

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Optical-Gain-based Sensing Using Inorganic-Ligand-Passivated Colloidal Quantum Dots
Nano Letters ( IF 9.6 ) Pub Date : 2021-09-13 , DOI: 10.1021/acs.nanolett.1c02547
Weiguo Chen _{1,

2,

3} , Xuechun Lu _{1,

2,

3} , Fengjia Fan _{1,

2,

3} , Jiangfeng Du _{1,

2,

3}

Affiliation

Thanks to their extremely large surface-to-volume ratio, colloidal quantum dots are potential high-performance sensing materials. However, previous sensing works using their spontaneous emission suffer from low sensitivities. The absence of an amplification process and the presence of the steric hindrance of long-chain organic ligands are two possible causations. Herein we propose that these two issues can be circumvented by using the amplified spontaneous emission of colloidal quantum dots capped by short-chain inorganic ligands. To exemplify this concept, we performed humidity sensing and observed a ∼31 times enhancement in sensitivity. Meanwhile, we found that the amplified spontaneous emission threshold power was reduced by 34% in a high humidity environment. On the basis of our transient absorption measurements, we attribute these observations to the mitigation of ultrafast subpicosecond trapping processes, which are enabled by the absorption of water molecules.

中文翻译：

使用无机配体钝化胶体量子点的基于光学增益的传感

由于其极大的表面积与体积比，胶体量子点是潜在的高性能传感材料。然而，以前使用自发发射的传感工作灵敏度低。没有扩增过程和存在长链有机配体的空间位阻是两个可能的原因。在本文中，我们提出可以通过使用由短链无机配体封端的胶体量子点的放大自发发射来规避这两个问题。为了举例说明这一概念，我们进行了湿度传感并观察到灵敏度提高了约 31 倍。同时，我们发现在高湿度环境下，放大的自发辐射阈值功率降低了 34%。根据我们的瞬态吸收测量，

更新日期：2021-09-22

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