Ligand Locking on Quantum Dot Surfaces via a Mild Reactive Surface Treatment,Journal of the American Chemical Society

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Ligand Locking on Quantum Dot Surfaces via a Mild Reactive Surface Treatment
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2021-08-10 , DOI: 10.1021/jacs.1c06777
Anna Loiudice ₁ , Ona Segura Lecina ₁ , Aurélien Bornet ₂ , Joseph M Luther ₃ , Raffaella Buonsanti ₁

Affiliation

At the outermost surface of colloidal QDs are organic surface ligands which dynamically bind and release in solution to control the growth kinetics, control the size/shape of the crystals, passivate surface states, and provide colloidal stability through favorable interactions with the solvent. However, the dynamicity comes at the expense of the stability of the QD suspension. Here, we show that ligands can be permanently locked on the QD surface by a thin layer of an inert metal oxide which forms within the ligand shell, over the headgroup. By interrogating the surface chemistry with different spectroscopic methods, we prove the ligand locking on the QD surface. As a result, an exceptional stability of the coated QD inks is achieved in a wide concentration range, even in the presence of chemically competing surface ligands in solution. We anticipate that this critical breakthrough will benefit different areas related to colloidal QDs, spanning from single-particle studies to displays and solar cells and biological applications. Furthermore, the same chemistry could be easily translated to surface treatments of bulk materials and thin films.

中文翻译：

通过温和的反应性表面处理在量子点表面上锁定配体

在胶体 QD 的最外层是有机表面配体，它们在溶液中动态结合和释放，以控制生长动力学、控制晶体的大小/形状、钝化表面状态，并通过与溶剂的有利相互作用提供胶体稳定性。然而，动态性是以牺牲 QD 悬架的稳定性为代价的。在这里，我们表明配体可以通过在配体壳内形成的惰性金属氧化物薄层，在头基上永久锁定在 QD 表面。通过用不同的光谱方法询问表面化学，我们证明了 QD 表面上的配体锁定。因此，即使在溶液中存在化学竞争的表面配体的情况下，涂覆的 QD 墨水也能在很宽的浓度范围内实现出色的稳定性。我们预计这一重大突破将使与胶体量子点相关的不同领域受益，从单粒子研究到显示器、太阳能电池和生物应用。此外，相同的化学过程可以很容易地转化为大块材料和薄膜的表面处理。

更新日期：2021-08-25

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