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Surface modification of PbS/CdS quantum dots. a) Schematic illustration of PbS/CdS quantum dots with hydrophilic cross-linked polymeric layers (P3 coating). b) Absorption spectrum of P3-QDs in PBS buffer. c) Emission spectrum of P3-QDs in PBS buffer, excited by an 808-nm laser. d) Dynamic light scattering analysis of P3-QDs in PBS buffer, P3-QDs had a number averaged hydrodynamic diameter of 26.5 nm.
