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. 2017 Mar 8;7:44076. doi: 10.1038/srep44076

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(a) Zeta potential data of LbL process; morphological characterization of the as-prepared D@GO-COOH@(PEI/PAA)₈ composites: (b and c), SEM images; (d) TEM image; (e and f) AFM images in height and 3D modes.