High resolution TEM studies of carbon nanotubes produced by spray pyrolysis

Multi-wall carbon nanotubes were grown inside a quartz tube by spray pyrolysis of ferrocene/benzene under gas flow. High resolution transmission electron microscopy was used in order to analyze the samples. The main features observed were huge nanotubes of the order of 250 μm and few nm wide capped at one end. Moreover, onion-like structures were also observed on different regions of the sample. Furthermore, it is good to stress that most of the carbon nanotubes showed filamentary formation although capricious sausage-like structures were also observed with iron particles inside the tubules.