Aligned carbon nanotubes grown on alumina and quartz substrates by a simple thermal CVD process

摘要

A very simple spray-coating method is presented here for depositing iron salt and iron sol-gel solutions on quartz and alumina substrates that can be efficiently used to produce carbon nanotubes (CNTs) by thermal chemical vapor deposition (CVD). Aligned and curly and randomly oriented multi-walled carbon nanotubes (MWNTs) have been efficiently grown from iron catalyst over large surfaces using mixtures of acetylene and ammonia under different experimental conditions. The effect of substrate, catalyst precursor, thermal and reductive catalyst pretreatment, and CNT growth temperature on the CNT diameter and morphology have been here studied and discussed.