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Transmission electron microscopy (TEM) micrograph showing image of (a) SPMNP synthesized by thermal decomposition; b Lipid coated SPMNP by ligand addition method; c DMSA functionalized SPMNP by ligand exchange method; d TMAOH functionalized SPMNP and schematic representation of different types of SPMNPs. e Schematic diagram for different types of SPMNP synthesis and functionalization
