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SEM image of a typical AP-Grade sample. The strand-like fibers in this image are "ropes" of parallel, individual single-walled carbon nanotubes (SWNT). Typical rope diameter: ~20 nm. Typical SWNT diameter: ~1.4 nm.

AP-Grade Nanotubes

  • Our bestselling product. AP-Grade (as-prepared) material is not chemically treated or processed.
  • Sample purity: 70-90 vol%, as determined by Raman spectroscopy.
  • Contains residual catalyst impurities (Ni, Y).
  • Shipped as powder in small glass bottles, unless otherwise specified by the customer.
  • Now routinely available in quantities of up to 250g per week.
  • The current AP-Grade price schedule is:
    •   
    Quantity
More than 100 grams
50-100 grams
Less than 50 grams
    		  
    Price
$60/g
$80/g
$100/g
  • In order to minimize our overhead shipping and handling expenses, a minimum order of $200 applies to all direct orders from CarboLex. Sub-gram quantities are available for purchase at Sigma Aldrich
  • To place an order or request a quote or additional information, please click here.
Single-Walled Nanotube General Information

CarboLex AP-grade SWNT consists of single-walled, closed-ended, carbon nanotubes, which are made by Arc Method in specifically designed chambers. These carbon nanotubes are of average diameter 1.4nm and are found in “ropes” which are typically ~20nm in diameter or approximately 50 tubes per rope with lengths of 2 – 5 microns. Impurities include approximately 35w% residual catalyst (NI, Y) which is usually encapsulated in carbon shells. Some amorphous carbon may also be found on the outer surfaces of the ropes. The only post synthesis treatment of the nanotubes comes from the homogenization of the tubes directly from the chamber. Purity of CarboLex AP-grade SWNT is 50-70% and the purity of SE-grade SWNT is 70-90%.

Chirality Information

CarboLex AP-grade samples are mat (mixed) samples which include both semiconducting (-2/3) and metallic (-1/3) tubes with chiral angles distributed between 0 and 30. To determine the chiral angle, it is shown that electron diffraction measurements with suitable TEM instruments and using micro-diffraction techniques can provide detailed structural information on an individual single-walled nanotube. Another method to determine the tube chiral angle is atomic resolution STM.

Summary of Thermal Conductivity of Nanotubes
  1. In disordered ‘mat’ samples, the thermal conductivity is -35 W/mK at room-temperature.
  2. For highly aligned SWNTs, the room temperature thermal conductivity is above 200 W/mK, within an order of magnitude of the room-temperature thermal conductivity of highly crystalline graphite.
  3. It is most possible that an individual nanotube will have significantly higher thermal conductivity than the bulk samples.


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