Metallic Single-Wall Carbon Nanotubes / m-SWCNT

Metallic SWNTs

Metallic Single-Wall Carbon Nanotubes / m-SWCNT

Metallic single-wall carbon nanotubes are a NanoIntegris exclusivity. Sorted using our patent density gradient ultracentrifugation (DGU) process. Offered in an acqueous solution or a powder.

Electronic Type Enrichment

Optical Absorbance

IsoNanotubes-M_figure1Figure 1. Optical absorbance plots for our IsoNanotubes-M (98%). IsoNanotubes-S (99%), and PureTubes, respectively. 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 metallic and semiconducting enrichment levels based on ratios of the M11 and S22 peak areas after linear background subtraction. Before comparison, the individual peak areas are scaled by empirically determined 400 600 800 1000 1200 values for the M11 and S22 extinction coefficients.



Metal Catalyst

Neutron Activation Analysis

  Unprocessed SWNTs IsoNanotubes-M + S
Nickel (wt %) 3.59 0.07
Yttrium (wt %) 0.70 0.38
Iron (wt %) 0.70 0.72
Total (wt %) 4.99 1.17
Iodine (wt %) 0.00 5.29

Full elemental profiles of our products are available upon request.

Figure 2. Neutron activation analysis (NAA) data taken from our IsoNanotube and PureTube powders. NAA reveals that our IsoNanotubes and PureTubes contain significantly lower levels of metallic/catalyst impurities than the raw arc discharge SWNTs from which they are produced. Our IsoNanotube samples, however, contain approximately 5% iodine by mass, resulting from residual iodixanol on the surface of the nanotubes that is not eliminated by our surfactant removal procedures.

Metal Catalyst

Thermogravimetric Analysis

IsoNanotubes-M_figure3Figure 3. Thermogravimetric (TGA) plots of our nanotube products. Approximately 2/3 of the ~15% mass decrease which occurs between ~200 and ~400°C is attributable to the burno!
of residual iodixanol adsorbed to the surface of the nanotubes. NAA data indicates that our IsoNanotubes contain roughly 5% iodine by mass (see Figure 3); iodine comprises roughly half the mass of an iodixanol molecule. The remaining 5% mass decrease is attributable to the burno! of residual surfactant and carbonaceous impurities.

Amorphous Carbon


IsoNanotubes-M_figure4Figure 4. Resonance Raman plots for our IsoNanotubes-M (95%). IsoNanotubes-S (99%), and PureTubes, respectively. 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-M_figure5Figure 5. Atomic-force microscopy (AFM) data indicates that our SWNTs range in length from approximately 100 nm to 4 microns. Length histograms of our IsoNanotubes-M respectively.

Properties at a Glance
Property IsoNanotubes-M 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 ~0.5 micron AFM 6    
Catalyst Impurity ~1% 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 70%, 95%, 98% or 99% Optical absorbance 2    
Shelf Life 6 months n/a n/a   n/a
Nanotube Concentration 0.01 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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IsoNanotubes-M Technical Data Sheet NanoIntegris supplies premium nanomaterials to companies and academic institutions developing next-generation electronics, energy, and biomedical technologies.