Fig. 2 | Nature Communications

Fig. 2

From: Boosting the down-shifting luminescence of rare-earth nanocrystals for biological imaging beyond 1500 nm

Fig. 2

Surface modification of the Er-RENPs. a Schematic illustration outlining the PMH coating and PEGylation procedure for the Er-RENPs (Er-RENPs@PMH-PEG). b DLS spectra of PMH capped RENPs before and after PEGylation. c DLS spectra demonstrating the well dispersibility of RENPs@PMH-PEG in different concentration of PBS solution. d Downconversion emission intensity of Er-RENPs@PMH-PEG in 1x PBS and 37 °C FBS solution as a function of days. The inset showed 1550 nm luminescence images of Er-RENPs@PMH-PEG in 1x PBS at 0th and 7th day. e Downconversion luminescence spectra of oleic acid-capped Er-RENPs dispersed in cyclohexane and Er-RENPs@PMH-PEG dispersed in water

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