To determine the purity of the nanotubes TGA gives a quantitative analysis of the level of concentration of up to 98% nanotubes and if necessary we can reprocess the tubes to achieve the proper purity level and metal content < .2%. by weight*
We also use SEM and TEM to view and evaluated the material.
Typically, SEM is used to evaluate the raw, as produce, nanotubes and TEM is used to evaluate the purified nanotubes.
Not every batch is tested due to cost and test equipment availability, but tests are ordered when processes are changed.
*(Care must be taken when weighting the ash/metal content of the Nanotube in the TGA, the metal catalyst Nickel tends to form NiO  in the TGA.  This can offset the actual weight of the metal through the addition of the oxygen.)

Singlewall Carbon nanotube - SWCNT
Multiwall Carbon nanotube - MWCNT
When the material is made (as-produce) the nanotubes comes straight out of the reactor with the approximate concentration of  95% MWCNT  ( 90% in the case of SWCNT) nanotube vs. non-nanotube material. These nanotubes are then processed and purified.  This step yields an increase in purity of the tubes which are sold as "Purified Open Material".  This step uses a Heat and Acid Wash process, which removes the non-nanotubic material.  (Non-Nanotubic material is usually comprised of amorphous and graphitic carbon, and metal catalyst, Nickel-Yttrium, Iron or other metals).  Also process may shortens the nanotubes by “end eroding” during the acid wash which removes the ends of the nanotubes.
A summary of the steps follows:
      . Heat nanotubes in air to 300C to expose the carbon surface and oxidize the metal catalyst. 
      . Sonicate and wash in nitric acid and/or HCL  to remove the metal catalyst, amorphous carbons and to open the ends of the nanotubes. 
      . Clean with solvent and hot air dry.  (acetone, ether and etc.)

MATERIAL SAFETY DATA SHEET

Singlewall Carbon nanotube - SWCNT, especially the metalic SWCNTs can be used for transparent conductor for PV´s and conductive circuitry. So, the SWCNTs is the better choice.

The TWCNTs or SWCNTs can be used to prepare the transparent conductive anode for OLED.

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Nanopowders tend to agglomerate. Dispersions are stable colloids of well separated nanoparticles. Dispersions also have less safety concerns. With dispersions, there is no need for special ventilation facilities. Dispersions are also easier to process for your product development.

We use a method called chemical vapor deposition (CVD). This method is low cost and allows for us to create high purity products (90%-98%). With CVD, we can also control the diameter and length of the nanotubes produced.

Single wall consists of one graphene layer rolled into a tube, Thus having a single wall. Double wall consists of two graphene layers rolled up, one within the other; Thus having two walls. Multi wall consists of many layers of graphene rolled one within another. Aligned nanotubes refer to the alignment of the individual nanotubes. Aligned nanotubes lie parallel to one another, all having the same alignment.

There are several different types of carbon nanotubes produced. They are: single wall carbon nanotubes, double wall carbon nanotubes & multi-wall carbon nanotubes. Multi wall carbon nanotubes come in various forms such as bundled carbon nanotubes & aligned carbon nanotubes.

Carbon nanotubes are molecular tubes about 10,000 times thinner than a human hair. They consist of rolled up sheets of carbon hexagons. They have remarkable electronic and mechanical properties that make them suitable for many applications.

. Conductive plastics      
. Structural composite materials 
. Flat-panel displays 
. Gasoline storage 
. Micro- and nano-electronics 
. Radar-absorbing coating 
. Technical textiles 
. Ultra-capacitors 
. Atomic Force Microscope (AFM) tips 
. Batteries with improved lifetime 
. Biosensors for harmful gases 
. Extra strong fibres