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A shows the TEM and STEM images of Au-IONPs. TEM reveals that the average size of Au-IO nanoparticles is approximately 10 nm (A1–2). The Au particles represented as dark dots in the bright field (A3) and bright dots in the high-angle annular dark field (Z contrast) image (A4). B demonstrates the hydrodynamic size (B1), zeta potential (B3) and stability results (B2) of Au-IONPs.
