Small Diameter SWNTs (HiPco™)

Small Diameter SWNTs

Product Residual Fe
Catalyst
Diameter Length
Raw <35% wt% 0.8 – 1.2 ~100 – 1,000 nm
Purified <15% wt% 0.8 – 1.2 ~100 – 1,000 nm
Super
Purified
<5% wt% 0.8 – 1.2 ~100 – 1,000 nm

Characterization Summary

Individual SWNT Diameteri ~0.8 – 1.2 nm
Individual SWNT Lengthii ~100 – 1000 nm
Calculated Molecular Weightiii ~3.4×105 – 5.2×106 Amu
Color Black
Morphology Dry powder of nanotubes bundled in ropes
Maximum Densityiv 1.6 g/cm3
Bulk Densityv ~0.1 g/cm3
TGA Residue as Fevi Dry powder of nanotubes bundled in ropes
– Raw <35 wt%
– Pure <15 wt%
– Super Pure <5 wt%
TGA 1st Derivative Peak Temperature Raw: ~350 – 410°C

Pure: ~470 – 490°C
Super Pure: ~510 – 540°C
TGA Onset Temperature Raw: ~350
Pure: ~440°C
Super Pure: ~450°C
Maximum Surface Areavii 1315 m2/g
BET Surface Area ~400 – 1000 m2/g
Buckypaper Resistanceviii ~0.2 – 2Ω
Moisture Content <5 wt%

Raman

TGA Profile

Particle Size Analysis ix

  1. Diameter distribution measured by Unidym from TEM micrographs. Mean diameter ~1.0 nm.

  2. Measured by Unidym using AFM.
  3. Calculated. Lower limit assumes a SWNT with a diameter of 0.8nm and a length of 100nm. (0.8nm/0.245nm)(3.1414)(2 carbon atoms) = 20 carbons around the circumference. For every 0.283nm length there are 4×20=80 carbon atoms. (100nm/0.283nm)(80)(12.01) = 339,505 Amu. Assuming 2 significant digits = 3.4×105. Upper limit assumes a SWNT with a diameter of 1.2nm and a length of 1,000nm. (1.2nm/0.245nm)(3.1414)(2 carbon atoms) = 31 carbons around the circumference. For every 0.283nm length there are 4×31 = 124 carbon atoms. (1000nm/0.283nm)(124)(12.01) = 5,262,332 Amu. Assuming 2 significant digits = 5.2×106.
  4. Calculated assuming single-wall nanotubes of diameter 1.0 nm arranged in crystalline “ropes” or “bundles” (inter-wall spacing 0.3 nm).
  5. Value provided is for standard purified SWNTs. Raw and some super pure grades lots will have lower bulk densities. Other product forms may have higher bulk densities.
  6. 800oC in air. The reported figures assume that the residue is present in the product as elemental Fe, and that it is fully converted to Fe2O3 during the TGA analysis. Hence, the TGA residual as measured is multiplied by MW Fe2/MW Fe2O3 (1/1.43) to express the result as Fe.
  7. Calculated using geometric arguments assuming an isolated tube. SSA for tubes in “ropes” will be less
    than the stated value. A. Peigney et al., Carbon 39 (2001), 507-514.
  8. In-house, Unidym buckypaper conductivity test (4 point probe).
  9. The following particle size histogram is indicative of the typical tertiary particle size distribution found in bulk powder. It does not represent secondary particles (aggregates of individual tubes also known as ropes or bundles) nor does it represent primary particle sizes (individual carbon nanotubes).

Product Applications

The use of NanoIntegris’ HiPco within scientific research has proven quite extensive. This small-diameter SWCNT material has found to be a valuable component for applications such as cancer therapy, battery electrode conductivity, electric field enhancement, thin film transistor creation, and gas sensors.

Cancer Gene Therapy

Biochemists at Nanyang Technological University have utilized NanoIntegris’ HiPco Raw powder as an siRNA nanoplex for the gene therapy of pancreatic cancer cells. [1] The 110 nm effective hydrodynamic diameter of the SWNT nanoplex makes them suitable for applications as nanocarriers for intracellular delivery and allowed them to be utilized for gene transfection against the mutant K-Ras gene in PANC-1 pancreatic cells.

Cells treated with the SWNT/PAH/SiRNA nanoplex formulation had the expression level of the targeted mutant K-Ras mRNA suppressed from 100±12.2% down to 66.88±5.14% while possessing low cytotoxicity and high biocompatibility. Such multifunctional and multimodal CNT formulations could be engineered for other advanced healthcare applications, integration with drug moecules, and prove beneficial in theranostics.

[1] Biomater. Sci., 2014, 2, 1244

Lithium Ion Battery Electrodes

In work performed at the Ulsan National Institute of Science and Technology, in conjunction with other Korean researchers, NanoIntegris’s HiPco SWCNTs were used to generate nanonets showing great promise as a broadly applicable platform technology for high-energy-density/ high performance energy conversion/ storage materials.

HiPco Super Purified powder was combined with PFO and OLO to form an OLO@mSC nanonet of metallic enriched material that enabled significant improvement in the areal mass loading of active materials in the OLO cathode while resulting in the higher areal capacity cells (1.62mAh/cm2 and 213mAh/g cathode). The OLO@mSC cathode showed high discharge capacity, high electronic conductivity ( ~0.10 S/cm), alleviated the rise in cell polarization, showed low internal cell resistances, high capacity retention during cycling (94% after 100 cyles) and facilitated the charge/ discharge reaction during cycling.

LNMO@mSC nanonets were also generated for use with LNMO cathodes. The LNMO@mSC showed a high capacity retention (97% after 200 cyles), had a low charge transfer resistance (RCT=6.6 Ω) with great growth suppression after cycling, indicating promise as electron-conductive shields.

The mSC nanonets were also investigated as a conducting coating layer on a perovskite catalyst – NSC. The NSC@mSC nanonets showed a high ORR onset potential (~-0.12 V) a large diffusion limiting current density (-5.2 mA/cm2), a low Tafel Slope (115 mV per decade), high current density, lower onset potential, and long-term stability after 1000 cyles (91.2%), all indicating that the NSC@mSC may be a promising bifunctional ORR/OER catalyst.

[1] J. Mater. Chem. A, 2017, 5, 12103-12112

Product Delivery

All HiPco Purified and Super Purified products are offered as a dry, granular powder.

We currently offer our HiPco Raw nanotube products in two forms: Fluffy Powder and Wet Cake. Due to safety concerns with handling the extremely low-density raw material, the HiPco Raw product is provided as a wet cake for orders of greater than 5g unless otherwise requested. The wet cake is roughly 10wt% nanotubes. The remaining mass is a mixture of 10% ethanol and 90% water, which can be easily removed by thermal or centrifugal treatment. (e.g. 10.70g of wet cake will be provided for a 1g HiPco Raw SWNT order.

HiPco Pricing

Price quotes available by request. Additional discounts also available for large volume orders. For more information contact our Sales Manager at sales@nanointegris.com or call +1-866-650-0482.