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Self-assembly of NaYF4:Yb,Er UC hexagonal nanorods with water-soluble chitosan into microspheres. (a) Photos of UC/chitosan microsphere aqueous dispersion under visible light (left) and NIR light (right), (b) optical microscopy images of UC/chitosan microspheres in the microemulsion dispersion (left) and aqueous media (right), and (c) SEM image and (d) TEM image of UC/chitosan microspheres.
