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Transmission electron microscope (TEM) and high-resolution transmission electron microscope (HRTEM) images of samples prepared under 2h pyrolysis at 973 K using 0.75 wt% Ni(NO3)2 as a catalyst precursor: (a) low-magnification TEM; (b) TEM of an individual carbon nanotube (CNT); (c) HRTEM image of an individual CNT; and (d) the top of CNTs.
