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pH stability comparison of QD@SiO2@PE-PEG with QDs with traditional surface coatings, QD@SH-PEG, QD@MAA, QD@PE-PEG, QD@PMAT, QD@PEI, and QD@SiO2. The panels on the right show the corresponding fluorescence images of QDs dispersed in pH 1 to 14 solutions (illuminated with a 365 nm handheld UV lamp).
