Monodisperse CdSe Quantum Dots Encased in Six (100) Facets via Ligand-Controlled Nucleation and Growth,Journal of the American Chemical Society

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Monodisperse CdSe Quantum Dots Encased in Six (100) Facets via Ligand-Controlled Nucleation and Growth
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-11-13 , DOI: 10.1021/jacs.0c06914
Liulin Lv ₁ , Jiongzhao Li ₁ , Yonghong Wang ₁ , Yufei Shu ₁ , Xiaogang Peng ₁

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Zinc-blende CdSe quantum dots (QDs) encased in six equal (100) facets are synthesized in a noncoordinating solvent. Their monodispersed size, unique facet structure, and single crystallinity render the narrowest ensemble photoluminescence for CdSe QDs (full width at half-maximum being 52 meV). The nucleation stage can selectively form small-size CdSe QDs (≤3 nm) as seeds suited for the growth of cube-shaped QDs by reducing the concentration of cadmium carboxylates (Cd(RCOO)2) as the sole source of ligands. While resulting in poorly controlled nucleation, chloride-ion ligands introduced in the form of soluble CdClx(RCOO)1-x (x = 0.1∼0.2) would thermodynamically stabilize the cadmium-terminated (100) facets yet kinetically accelerate the deposition of selenium ions onto the (100) facets. Results suggest that it is fully feasible to synthesize QDs simultaneously with monodisperse size and surface structure through ligand-controlled nucleation and growth.

中文翻译：

通过配体控制的成核和生长将单分散 CdSe 量子点包裹在六 (100) 个小平面中

在非配位溶剂中合成了包含在六个相等 (100) 小平面中的闪锌矿 CdSe 量子点 (QD)。它们的单分散尺寸、独特的小平面结构和单结晶度为 CdSe QD 提供了最窄的整体光致发光（半高全宽为 52 meV）。成核阶段可以通过降低作为唯一配体来源的羧酸镉 (Cd(RCOO)2) 的浓度，选择性地形成小尺寸 CdSe QD (≤3 nm) 作为适合立方形 QD 生长的种子。虽然导致成核控制不佳，但以可溶性 CdClx(RCOO)1-x (x = 0.1∼0.2) 形式引入的氯离子配体会在热力学上稳定以镉为末端的 (100) 晶面，但会在动力学上加速硒离子的沉积到（100）个方面。

更新日期：2020-11-13

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