Relating carbon nanotube growth parameters to the size and composition of nanocatalysts

Wei Hung Chiang, R. Mohan Sankaran

Research output: Contribution to journalArticlepeer-review

Abstract

A gas-phase approach to studying carbon nanotube (CNT) nucleation and growth from nanoparticle catalysts has been developed. Dimensionally- and compositionally-tuned metal particles with mean diameters between 2 and 5 nm and standard deviations less than 15% are initially synthesized from metallocene vapors in an atmospheric-pressure microplasma. The nanocatalysts are continuously fed with acetylene and hydrogen into a flow furnace reactor to grow CNTs. Kinetic studies are performed by in situ aerosol size classification of the nanotubes to relate the CNT length and thus, the growth rate in our thermal process to the catalyst size and composition. We find that reducing the catalyst size results in an increase in the growth rate while varying the catalyst composition affects the growth rate, activation energy, and the onset temperature for CNT growth.

Original languageEnglish (US)
Pages (from-to)946-952
Number of pages7
JournalDiamond and Related Materials
Volume18
Issue number5-8
DOIs
StatePublished - May 2009
Externally publishedYes

Keywords

  • Carbon nanotube
  • Catalyst
  • Microplasma

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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