Aligned Multi-Walled Carbon Nanotubes for High-Sensitivity Gas Sensors

By: Joe Porwoll, Material Matters 2007, 2.4, 3.

Aligned Multi-Walled Carbon Nanotubes (MWCNTs)

Dr. Karl Gross, of Hy-Energy LLC, kindly suggested that high-quality carbon nanotube arrays are needed for research and development of high-sensitivity gas sensors. We are pleased to offer highly aligned arrays of multiwall carbon nanotubes (MWCNTs) as new products in our catalog. These arrays, available on silicone (Aldrich Product No. 687804) or copper (Aldrich Product No. 687812) substrates, can provide a unique platform for a wide range of materials research and development, including gas adsorption sensor and sensor substrates,1 catalysts, electron emission sources,2 and battery and capacitor development.3

Carbon nanotube array, multi-walled, vertically aligned, on silicon wafer substrate

Carbon nanotube array, multi-walled, vertically aligned, on copper substrate

CNT array (black square) in the semiconductor grade package. Inset shows SEM image of the vertically aligned MWCNTs.

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Material Matters 2007, 2.4, 3.


  • 99.9% as MWCNT
  • CNT diameters are 100 nm ± 10 nm
  • CNT lengths are 30 μm ± 3 μm
  • Array density ~2 x 109 MWCNT/cm2
  • Array dimensions 1 sq. cm
  • Grown by plasma-enhanced CVD (PECVD)
  • Grown with the nickel catalyst tip intact
  • Packaged in a clean room; stored, and shipped in semiconductor grade packaging.

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  1. Collins, P.G., Bradley, K. Ishigami, M. Zettl, A., Science, 2000, 287, 1801.
  2. Bonard, J. M., Stockli, T., Maier, F., De Herr, W. A., Chatelain, A., Ugarte, D., Salvetat, J. P., Forro, L., Physical Review Letters, 1998, 81, 1441.
  3. Frackowiak, E., Gautier, S., Gaucher, H., Bonnamy, S., Beguin, F., Carbon, 1999, 37, 61

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