Investigation into preparation of carbon nanotubes films bycatalyzed decomposition of low hydrocarbons

摘要

The metal membrane were coated on silicate substrates by ion sputtering method. The membranes coated were reducedrnwith hydrogen (H2) at high temperature in situ and then used to catalyze the decomposition of low hydrocarbons to preparernthe re-latively well-distributed carbon nanotubes films (CNTFs). The effects of sputtering time, reduction time andrntemperature, etching, and sonication treatment in ammonia, on the morphology of CNTFs were investigated, respectively.rnScanning electron microscopy (SEM) measurements showed that the CNTs in the CNTFs became more orderly with thernincrease of sputtering time, but their diameters changed little. CNTs in the CNTFs would grow more compact with thernincrease of reduction time or temperature. CNTs in CNTFs would not grow very tightly, if the membranes coated werernetched or/and treated in ammonia for some time beforehand. CNTFs may consist of mainly the bundles, or ribbon, or localrnand unperfect pseudo-arrays of mul-tiwalled carbon nanotubes (MWCNTs), depending on the conditions of the metalrnmembrane preparation, the H2 reduction, and the catalystic reaction.