Nanoengineering Ni xFe 1-x catalysts for gas-phase, selective synthesis of semiconducting single-walled carbon nanotubes

Wei Hung Chiang, Mohammed Sakr, Xuan P.A. Gao, R. Mohan Sankaran

Research output: Contribution to journalArticlepeer-review

Abstract

The inhomogeneity of as-grown single-walled carbon nanotubes (SWCNTs), in terms of chiral structure, is a major obstacle to integration of these novel materials in advanced electronics. While separation methods have circumvented this problem, current synthesis approaches must be refined for large-scale production of SWCNTs with uniform properties. In addition, it is highly desirable to alter the initial chirality distribution which constrains fundamental study and applications. Here, we demonstrate that semiconducting SWCNTs are selectively produced in the gas phase by engineering catalysts at the nanoscale with precise size and composition. The semiconducting content in as-grown mixtures of SWCNTs is assessed by UV-visible-NIR absorbance and micro-Raman spectroscopy and reaches a maximum purity of 90% for samples catalyzed by Ni 0.27Fe 0.73 nanoparticles (2.0 nm mean diameter). Electrical studies are performed on thin film transistors (TFTs) fabricated from as-grown SWCNTs and reveal high on/off current ratios of 10 3.

Original languageEnglish (US)
Pages (from-to)4023-4032
Number of pages10
JournalACS Nano
Volume3
Issue number12
DOIs
StatePublished - Dec 22 2009
Externally publishedYes

Keywords

  • Bimetallic
  • Carbon nanotube
  • Chirality
  • Nanoparticle

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy

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