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Photomicrographs of the Cu embroidered current collector (a) before and (b,c) after the growth of the vertically-aligned carbon nanotubes (VA-CNTs) with plasma-enhanced chemical vapor deposition (PECVD); (d,e) SEM images of the as-grown VA-CNTs. In part (a), the specimen was placed directly on the microscope stage and in parts (b,c), a paper was placed under the specimen.
