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Transmission electron microscope (TEM) and high-resolution transmission electron microscope (HRTEM) images of product samples resulting from pyrolysis of waste polyethylene under optimal conditions: (a) low-magnification TEM; (b) an individual carbon nanotube (CNT) with a cap-shaped structure; (c) HRTEM image of an individual CNT, and (d) Ni catalyst encapsulated in a CNT.
