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(a) DLS profile of P-PPor NPs (Insert: TEM image of P-PPor NPs); (b) Zeta potential of P-PPor NPs; (c) UV–Vis–NIR spectra of Por, PDI, P-PPor and P-PPor NPs; (d) Near-infrared fluorescence spectra of P-PPor and P-PPor NPs ranging from 850 to 1400 nm.
