Abstract
A mass of ultralong aligned carbon nanotube (CNT) bundles up to about 8 mm in lengthwas synthesized by utilizing the spray pyrolysis of ferrocene/xylene solutions in theabsence of promoters, such as thiophene or pure sulfur, and etching agents, suchas plasma, oxygen, ethanol or water. Scanning electron microscopy (SEM) andhigh-resolution transmission electron microscopy (HRTEM) results indicated thecontinuous and multi-walled nanotube structure for the CNTs in the macroscopicalbundles. A graph demonstrating the correlation between growth time and lengthof CNT arrays revealed that the maximum growth rate reaches approximately4612 nm s−1. Based on the experimental phenomena and results, a continuous rapid growthmechanism in both directions was proposed, which suggests that longer CNTarrays can be synthesized at this rapid growth rate if the growth time is extended.
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