Characterization of Indium Phosphide Quantum Dot Growth Intermediates Using MALDI-TOF Mass Spectrometry.

Author(s) Xie, L.; Shen, Y.; Franke, D.; Sebastian, V.; Bawendi, M.G.; Jensen, K.F.
Journal J Am Chem Soc
Date Published 2016 Oct 3
Abstract

Clusters have been identified as important growth intermediates during III-V quantum dot (QD) formation. Here we report a one-solvent protocol that integrates synthesis, purification and mass characterization of indium phosphide quantum dot growth mixtures. The use of matrix-assisted laser desorption/ionization (MALDI) mass spectrometry (MS) successfully tracks the evolution of clusters and the formation of quantum dots throughout the synthesis. Similar clusters are observed during the formation of large particles, suggesting that these clusters serve as a reservoir for quantum dot formation. Combining MALDI and NMR techniques further enables us to extract extinction coefficients and construct sizing curves for cluster-free indium phosphide QDs. The use of MALDI MS opens new opportunities for characterization and mechanistic studies of small-sized air-sensitive clusters or QDs.

DOI 10.1021/jacs.6b06468
ISSN 1520-5126
Citation Xie L, Shen Y, Franke D, Sebastian V, Bawendi MG, Jensen KF. Characterization of Indium Phosphide Quantum Dot Growth Intermediates Using MALDI-TOF Mass Spectrometry. J Am Chem Soc. 2016.

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