Pure- and SuperPureTubes Single-Wall Nanotubes – SWCNT

Ultra High Purity SWNTs

Pure- and SuperPureTubes Single-Wall Nanotubes – SWCNT

These single-wall carbon nanotubes are purified to values of 95-98% (nanotube content measured via the Itkis ratio). PureTubes offer metal content lower than 5% and SuperPureTubes offer less than 2% metal content (as per TGA). These are our highest purity un-sorted nanotubes. Sourced from the arc-discharge processes and offered in solution or dry powder.


Optical Absorbance

IsoNanotubes-S_figure1Figure 1. Optical absorbance plots for our PureTubes. Following the method of Ouyang et al. (Acc. Chem. Res. 35, 1018 (2002)), we can calculate the transition energies for nanotubes in our diameter range (1.2 – 1.7 nm). We see peaks where we would expect them: S33 transitions should lie between ~450-630 nm, M11 transitions between ~600-850 nm, and S22 transitions between ~ 900-1,270 nm. We estimate our SWCNT purity by the ratio of the S22 peak area (after linear background subtraction) to the total area in the band (Itkis et al. JACS (2005) 127, pp 3439-3448). Before comparison, the individual peak areas are scaled by empirically determined values for the M11 and S22 extinction coefficients.


Metal Catalyst

Neutron Activation Analysis

  Unprocessed SWNTs PureTubes
Nickel (wt %) 3.59 0.23
Yttrium (wt %) 0.70 0.05
Iron (wt %) 0.70 0.06
Total (wt %) 4.99 0.34
Iodine (wt %) 0.00 0.00

Full elemental profiles of our products are available upon request.

Figure 2. Neutron activation analysis (NAA) data taken from our unprocessed and PureTube powders. NAA reveals that our PureTubes contain significantly lower levels of metallic/catalyst impurities than the raw arc discharge SWNTs from which they are produced.

Metal Catalyst

Thermogravimetric Analysis

IsoNanotubes-S_figure2Figure 3. Thermogravimetric (TGA) plots of our nanotube products. Because our PureTubes do not contain iodixanol, the burnoff of residual surfactant and amorphous carbon is solely accountable for the ~5% mass decrease which occurs between approximately 200 and 400°C.

Amorphous Carbon


IsoNanotubes-S_figure3Figure 4. Resonance Raman plots for our PureTubes. All Raman measurements were taken using a 514 nm laser. The G/D ratios of our products range from approximately 12 to 41, indicating extremely low levels of amorphous carbon and/or damaged nanotubes.


Atomic Force Microscopy

IsoNanotubes-S_figure4Figure 5. Atomic-force microscopy (AFM) data indicates that our SWNTs range in length from approximately 100 nm to 4 microns. Length histograms of our PureTubes.

Properties at a Glance
Property PureTubes Measurement Set Figure Solution Powder
Nanotube Type Arc discharge Manufacturer data n/a    
Diameter Range 1.2 – 1.7 nm Manufacturer data n/a    
Mean Diameter 1.4 nm Manufacturer data n/a    
Length Range 100 nm – 4 μm AFM 6    
Mean Length ~1 micron AFM 6    
Catalyst Impurity ~0.5% by mass NAA, TGA 3, 4    
Carbonaceous Impurity < 5% by mass TGA, Raman 4, 5    
Semiconducting CNT Content n/a Optical absorbance 2    
Metallic CNT Content n/a Optical absorbance 2    
Shelf Life 6 months n/a n/a   n/a
Nanotube Concentration 0.25 mg/mL n/a n/a   n/a
Surfactant Concentration 1% w/v n/a n/a   n/a
Surfactant Type Ionic (proprietary mixture) n/a n/a   n/a

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Pure- and SuperPureTubes Technical Data Sheet NanoIntegris supplies premium nanomaterials to companies and academic institutions developing next-generation electronics, energy, and biomedical technologies.