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Physicochemical characteristics of GO and GO-NH2 nanoparticles assessed by transmission electron and atomic force microscopy. Just prior to all microscopic measurements both GO and GO-NH2 nanoparticles were diluted in distilled water and were sonicated for 1 hour. (a) Transmission electron microscopy of GO and GO-NH2 nanoparticles. (b) Representative АFM images of sonicated GO and GO-NH2 and the corresponding height profiles.
