Effects of ammonia on microstructure and graphitic degree of carbon nanotubes prepared by CVD method

Wanliang Mi, Jerry Lin, Yongdan Li, Baoquan Zhang

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

Vertically aligned carbon nanotubes (CNTs) was prepared on porous Al2O3 substrate by the CVD method with ferrocene as catalyst precursor, acetylene as carbon source and NH3, N2 as carrier gases. Raman spectrum, scanning electron microscope (SEM), high-resolution electron microscope (HRTEM), X-ray diffraction (XRD) and elemental analysis were employed to characterize the materials. Experiment results showed that CNTs grown in NH3 were bamboo-shaped structure at 800°C, containing about 3.46% (mass) N element and had a space between graphitic layers about 0.384 nm. Moreover, Fe3C and Fe2N or Fe3N compound were detected in the carbon product. Catalyst surface property changed as a result of the NH3 adsorption in Fe catalyst and adulteration of N in the CNTs made the CNTs show some crystal distortion and a low graphitic degree. CNTs diameter increased with reaction temperature.

Original languageEnglish (US)
Pages (from-to)964-969
Number of pages6
JournalHuagong Xuebao/Journal of Chemical Industry and Engineering (China)
Volume57
Issue number4
StatePublished - Apr 1 2006

Keywords

  • Acetylene
  • Adulteration
  • Bamboo-shaped structure
  • Carbon nanotube
  • FeC
  • Graphitic degree
  • NH
  • Porous substrate

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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