化学
磷化铟
量子点
质谱法
星团(航天器)
表征(材料科学)
解吸
分析化学(期刊)
铟
纳米技术
光电子学
色谱法
物理化学
有机化学
吸附
物理
材料科学
程序设计语言
砷化镓
计算机科学
作者
Lisi Xie,Yi Shen,Daniel Franke,Víctor Sebastián,Moungi G. Bawendi,Klavs F. Jensen
摘要
Clusters have been identified as important growth intermediates during group III–V quantum dot (QD) formation. Here we report a one-solvent protocol that integrates synthesis, purification, and mass characterization of indium phosphide (InP) QD growth mixtures. The use of matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS) successfully tracks the evolution of clusters and the formation of QDs throughout the synthesis. Similar clusters are observed during the formation of large particles, suggesting that these clusters serve as a reservoir for QD formation. Combining MALDI and NMR techniques further enables us to extract extinction coefficients and construct sizing curves for cluster-free InP QDs. The use of MALDI MS opens new opportunities for characterization and mechanistic studies of small-sized air-sensitive clusters or QDs.
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