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Synthesis and Characterization of Boron-Doped Single-Wall Carbon Nanotubes Produced by the Laser Vaporization Technique

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Jeff L. Blackburn,*^† Yanfa Yan,^† Chaiwat Engtrakul,^† Philip A. Parilla,^† Kim Jones,^† Thomas Gennett,^‡ Anne C. Dillon,^† and Michael J. Heben^†

Center for Basic Science, National Renewable Energy Laboratory, 16253 Denver West Parkway, Golden, Colorado 80401, and Rochester Institute of Technology, 85 Lamb Memorial Drive, Rochester, New York, 14623

Chem. Mater., 2006, 18 (10), pp 2558–2566

DOI: 10.1021/cm060192i

Publication Date (Web): April 14, 2006

Section:

Ceramics

Abstract

We present the first successful high-yield laser vaporization synthesis of high-quality boron-doped single-wall carbon nanotubes (B-SWNTs). Boron was loaded into graphite targets in the form of elemental B as well as nickel boride (NiB) and vaporized in a laser-oven apparatus in both Ar and N₂ ambients. Although targets containing elemental B produced no or low yields of SWNTs, the NiB catalyst in N₂ produced SWNT bundles comparable in quality to the best pure-carbon SWNTs produced from traditional Ni/Co catalysts. A variety of different samples were analyzed by transmission electron microscopy, Raman spectroscopy, X-ray diffraction, and nanoprobe electron energy loss spectroscopy (EELS). Boron was found to be doped substitutionally in the SWNT lattice at contents up to 1.8 at % by EELS. The ¹³C NMR chemical shift of SWNT nuclei is affected by boron doping by shifting to higher frequency, as expected for p-type doping. The EELS and NMR data exclude the possibility of B and N codoping. Aspects of the growth mechanism are discussed.

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This article has been cited by 7 ACS Journal articles (5 most recent appear below).

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Diffusion-Ordered NMR Spectroscopy in the Structural Characterization of Functionalized Carbon Nanotubes
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  Abstract | Full Text HTML | Hi-Res PDF | PDF w/ Links
Transparent Boron-Doped Carbon Nanotube Films
X. M. Liu, H. E. Romero, H. R. Gutierrez, K. Adu and P. C. Eklund
Nano Letters2008 8 (9), 2613-2619
- Transparent Boron-Doped Carbon Nanotube Films
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  We report results of studies on the sheet resistance and optical transmission of thin films of boron-doped single-walled carbon nanotubes (SWNTs). Boron doping was carried out by exposure of SWNTs to B2O3 and NH3 at 900 °C and 1−3 atom % boron was found ...
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Purification of Single-Walled Carbon Nanotubes by a Highly Efficient and Nondestructive Approach
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- Purification of Single-Walled Carbon Nanotubes by a Highly Efficient and Nondestructive Approach
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  A new method is reported for purification of single-walled carbon nanotubes (SWCNTs). Experimental results show that catalytic particles can be completely removed. More importantly, the efficient purification induces little damage to the graphitic ...
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Calculations of Dihydrogen Binding to Doped Carbon Nanostructures
Tatsuhiko Sagara and Eric Ganz
The Journal of Physical Chemistry C2008 112 (10), 3515-3518
- Calculations of Dihydrogen Binding to Doped Carbon Nanostructures
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  The Journal of Physical Chemistry C2008 112 (10), 3515-3518
  We used second-order Mller-Plesset perturbation theory to calculate the binding energies of hydrogen molecules to various carbon nanostructures, in an effort to find improved hydrogen storage materials. For the central concave site of corannulene, a new ...
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