Intershell spacing changes in MWCNT induced by metal-CNT interactions

► Carbon nanotubes obtained from ethanol decomposition over LaNiO3 perovskite-oxide structure as a catalyst precursor. ► TEM micrographs analysis of different structures and defects found in the carbon nanotubes. ► Influence of the position of the metal catalyst on different deformations of the graphene sheet structure.