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Characterization of Indium Phosphide Quantum Dot Growth Intermediates Using MALDI-TOF Mass Spectrometry
journal contribution
posted on 2016-10-03, 00:00 authored by Lisi Xie, Yi Shen, Daniel Franke, Víctor Sebastián, Moungi G. Bawendi, Klavs F. JensenClusters 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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QD growth mixturesextinction coefficientsmass spectrometrygrowth intermediatessizing curvesone-solvent protocolmass characterizationQD formationsmall-sized air-sensitive clustersIIIcluster-free InP QDsIndium Phosphide Quantum Dot Growth IntermediatesMALDI-TOF Mass Spectrometry Clustersindium phosphideSimilar clustersMALDI MSNMR techniques
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