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Ligand Counting and Size Determination of Quantum Dots Using Electronegative Matrix-Assisted Laser Desorption Ionization Mass Spectrometry In this study, we demonstrated that a highly electronegative, fluorinated porphyrin (TPFP) is an efficient soft MALDI matrix for the precise characterization of QD core size and surface-capping ligand stoichiometry. The soft MALDI ionization of QDs using TPFP in this work will serve as a new experimental approach for quantitative study of the surface-capping ligands, offering new insights into not only the QD size and composition but also surface chemistry. more

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