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HAADF-STEM images. (A) HAADF-STEM image of a sliced single crystalline of Fe-BTC/PDA-19 and (B–D) the corresponding EDX elemental mapping. (E) STEM-EDX line profile of nitrogen across the region indicated in (A). The line profile is 275 nm long and is integrated over 100 nm. Elemental mapping was done after the composite was soaked in a highly concentrated aqueous solution of Pb2+.
