Ion-Pair Ligand-Assisted Surface Stoichiometry Control of Ag2S Nanocrystals,Chemistry of Materials

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Ion-Pair Ligand-Assisted Surface Stoichiometry Control of Ag2S Nanocrystals
Chemistry of Materials ( IF 7.2 ) Pub Date : 2022-11-03 , DOI: 10.1021/acs.chemmater.2c02038
Yunmo Sung ₁ , Wonseok Lee ₁ , Eunjae Lee ₁ , Young Ho Ko ₂ , Sungjee Kim _{1,

3}

Affiliation

Surface atom stoichiometry is controlled for Ag₂S NCs through ion-pair ligand-assisted surface reactions. Predominantly cation-rich-surfaced Ag₂S NCs (Ag-Ag₂S), anion-rich-surfaced Ag₂S NCs (S-Ag₂S), and perfectly stoichiometric Ag₂S NCs (st-Ag₂S) are prepared. Various combinations of cation and anion pairs are studied for Ag₂S NC surface reactions. Depending on the hardness/softness of the ion-pair ligands, the NC surface shows disparate reactions of (i) X-type anion replacing native X- and L-type ligands, (ii) binding as the whole ion-pair ligand, and (iii) one-to-one exchange by the positive cation ligand. Ion-pair-assisted surface chemistry enables the synthesis of perfectly stoichiometric-surfaced Ag₂S NCs, which shows that the fluorescence intensity increased by more than ten times, and epitaxial ZnS growth on st-Ag₂S was enhanced more than three times when compared with non-stoichiometric NCs.

中文翻译：

Ag2S 纳米晶体的离子对配体辅助表面化学计量控制

通过离子对配体辅助表面反应控制 Ag ₂ S NC的表面原子化学计量。主要是富含阳离子的表面 Ag ₂ S NCs (Ag-Ag ₂ S)、富含阴离子的表面 Ag ₂ S NCs (S-Ag ₂ S) 和完全化学计量的 Ag ₂ S NCs (st-Ag ₂ S)准备好了。_{研究了 Ag 2}的各种阳离子和阴离子对组合S NC 表面反应。根据离子对配体的硬度/软度，NC 表面表现出不同的反应（i）X 型阴离子取代天然 X 型和 L 型配体，（ii）作为整个离子对配体结合，和(iii) 正阳离子配体的一对一交换。离子对辅助表面化学能够合成完美化学计量表面的 Ag ₂ S NCs，这表明荧光强度增加了十倍以上，并且 st-Ag ₂ S 上的外延 ZnS 生长增强了三倍以上与非化学计量的 NC 相比。

更新日期：2022-11-03

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