膦酸盐
反应性(心理学)
配体(生物化学)
纳米晶
化学
纳米棒
量子产额
羧酸盐
分散性
磷化氢
光致发光
分子
作者
Evert Dhaene,Rohan Pokratath,Olivia Aalling-Frederiksen,Kirsten M. Ø. Jensen,Philippe Smet,Klaartje De Buysser,Jonathan De Roo
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-04-27
标识
DOI:10.1021/acsnano.1c08966
摘要
Ligands play a crucial role in the synthesis of colloidal nanocrystals. Nevertheless, only a handful molecules are currently used, oleic acid being the most typical example. Here, we show that monoalkyl phosphinic acids are another interesting ligand class, forming metal complexes with a reactivity that is intermediate between the traditional carboxylates and phosphonates. We first present the synthesis of n-hexyl, 2-ethylhexyl, n-tetradecyl, n-octadecyl, and oleylphosphinic acid. These compounds are suitable ligands for high-temperature nanocrystal synthesis (240-300 °C) since, in contrast to phosphonic acids, they do not form anhydride oligomers. Consequently, CdSe quantum dots synthesized with octadecylphosphinic acid are conveniently purified, and their UV-vis spectrum is free from background scattering. The CdSe nanocrystals have a low polydispersity and a photoluminescence quantum yield up to 18% (without shell). Furthermore, we could synthesize CdSe and CdS nanorods using phosphinic acid ligands with high shape purity. We conclude that the reactivity toward TOP-S and TOP-Se precursors decreases in the following series: cadmium carboxylate > cadmium phosphinate > cadmium phosphonate. By introducing a third and intermediate class of surfactants, we enhance the versatility of surfactant-assisted syntheses.
科研通智能强力驱动
Strongly Powered by AbleSci AI