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. 2020 Jan 29;45(4):809–824. doi: 10.1007/s11064-020-02954-y

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© The Author(s) 2020

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Fig. 1 — Visualization of NPs. The crystalline structure of uncoated CuO-NPs (a) and CuO-Fe-NPs (b) was visualized by transmission electron microscopy. The scale bar in b represents 50 nm and applies to both panels