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a) TEM images of hybrid GdMOF-PAA-Au nanocomposite with HAuCl4 as the gold precursor, where the darker (black) dots are the AuNPs. b) The size distribution of AuNPs on PAA modified GdMOF nanoparticles were analyzed by measuring the diameter of 200 AuNPs from TEM images. TEM images of c) Gd-PAA-Au nanocomposites prepared with PAA modification at lower magnification and d) unmodified GdMOF particles mixed directly with 0.44 mL of 0.01 M HAuCl4 solution and followed by reduction.
