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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
engineering
Nanoengineering Ni
x
Fe
1-x
catalysts for gas-phase, selective synthesis of semiconducting single-walled carbon nanotubes
ACS Nano, Volume 3, No. 12, Year 2009
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Description
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. © 2009 American Chemical Society.
Authors & Co-Authors
Chiang, Wei Hung
United States, Cleveland
Case Western Reserve University
Sakr, Mohammed R.
Egypt, Alexandria
Faculty of Science
Gao, X. P.A.
United States, Cleveland
Case Western Reserve University
Sankaran, R. M.
United States, Cleveland
Case Western Reserve University
Statistics
Citations: 50
Authors: 4
Affiliations: 2
Identifiers
Doi:
10.1021/nn901222t
ISSN:
19360851
e-ISSN:
1936086X
Research Areas
Environmental