Fig. 2.

a TEM image of RHE. b TEM and SEM images of RD NPs. c Fluorescence spectra of RHE (200 μM), DOX (200 μM) and RD NPs (200 μM RHE and 200 μM DOX). λ_ex (RHE) = 360 nm; λ_ex (DOX) = 475 nm. d Photographs and the Tyndall effect of 1) RHE in a DMSO/water solution (99% water), 2) DOX in aqueous solution, 3) H₂O, and 4) RD NPs in a DMSO/water solution (99% water). e The particle size and PDI of RD NPs during storage at 4 °C. f Changes in the particle size and PDI of RD NPs stored in 10% FBS for 24 h. Cumulative release of g RHE and h DOX from RHE, DOX and RD NPs at pH 7.4 and 5.0