Double-Walled Carbon Nanotubes (DWCNTs)
Double-Walled Carbon Nanotubes (DWCNTs) – High-Purity 2-4 nm OD, ~50 µm Length
Overview
Double-walled carbon nanotubes (DWCNTs) are a unique class of one-dimensional carbon nanomaterials, consisting of two concentric graphene cylinders – one nested inside another. This structure offers distinct advantages over single-walled nanotubes (SWCNTs): the outer wall can be chemically modified without affecting the inner wall, enabling tailored surface functionality while preserving the intrinsic electronic and mechanical properties of the inner tube. Additionally, DWCNTs combine solubility and functionalization capabilities that are often mutually exclusive in SWCNTs.
Product Grades (GK-CN-06 Series)
We offer three high-purity DWCNT grades to suit different application needs:
| Grade | Code | Purity | Outer Diameter (OD) | Length | Functional Group |
|---|---|---|---|---|---|
| Pristine | GK-CN-06 | >60 wt% | 2–4 nm | ~50 µm | None (as-produced) |
| Hydroxyl | GK-CN-06H | >60 wt% | 2–4 nm | ~50 µm | –OH (hydroxyl) |
| Carboxyl | GK-CN-06C | >60 wt% | 2–4 nm | ~50 µm | –COOH (carboxyl) |
Key Properties
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High aspect ratio – length-to-diameter ratio >10,000, providing excellent reinforcement and conductive networks.
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Thermal stability – stable up to 600 °C in air (oxidation onset).
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Electrical conductivity – metallic or semiconducting depending on chirality, with high current-carrying capacity.
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Mechanical strength – tensile strength ~50–100 GPa, Young's modulus ~1 TPa.
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Surface functionality – hydroxylated and carboxylated grades offer dispersibility in polar solvents and reactive sites for further conjugation (e.g., polymers, biomolecules, metals).
Applications
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Polymer composites – improve mechanical strength, thermal conductivity, and electrostatic discharge (ESD) properties.
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Electronics & sensors – transparent conductive films, field-effect transistors (FETs), supercapacitors, and battery electrodes.
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Energy storage – additives for lithium-ion anodes, supercapacitor electrodes, and fuel cell catalysts.
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Coatings & paints – anti-static and anti-corrosion coatings.
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Biomedical – drug delivery, biosensors, and tissue engineering scaffolds (functionalized grades).
Recommended Usage
Typically 0.1–5 wt% in composite matrices, depending on desired property enhancement.
Handling & Dispersion
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Pristine DWCNTs are hydrophobic; use surfactants or sonication in organic solvents.
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Hydroxylated (–OH) and carboxylated (–COOH) grades disperse well in water, alcohols, and polar media without additional surfactants.
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Avoid prolonged inhalation of dust; use fume hood and appropriate PPE.
Packaging
Available in 1 g, 5 g, 10 g, 50 g, and 100 g bottles, or bulk quantities upon request. Sealed in inert atmosphere to prevent oxidation.
Storage
Store in a cool, dry place, away from strong oxidizers. Shelf life: 24 months when kept sealed.
Quality Assurance
Each batch is characterized by Raman spectroscopy, TGA, TEM, and BET surface area analysis to ensure consistent purity and dimensions. Custom functionalization (e.g., amine, thiol) available on request.
