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Transmission electron microscopy (TEM) micrographs of Cu nanoparticles from samples a, b, c and d obtained by laser ablation using (a) Green-Nanosecond laser in air, (b) Green-Nanosecond laser in argon, (c) IR-Picosecond laser in air, (d) IR-Picosecond laser in argon, as reported in Table 2.
