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Description
Single Walled Carbon Nanotubes (SWCNTs, SWNTs), Purity > 99%, Diameter: 1.0 nm
Single-walled carbon nanotubes (SWCNTs) are cylindrical nanostructures composed of a single layer of graphene rolled into a seamless tube. They exhibit extraordinary electrical, thermal, and mechanical properties, making them one of the most promising nanomaterials in various high-tech applications. With high purity and narrow diameter distribution, these SWCNTs are ideal for advanced research and industrial applications where performance is critical.
Our high-purity SWCNTs (99%+) have excellent conductivity, thermal resistance, and aspect ratio, making them suitable for composites, energy devices, electronic components, and more.
Technical Properties
| Property | Value |
|---|---|
| Purity | > 99 wt% |
| Outer Diameter (OD) | 1-2 nm |
| Inner Diameter (ID) | 0.8-1.6 nm |
| Average Diameter | ~1.0 nm |
| Length | 5–30 µm (TEM) |
| Specific Surface Area (BET) | > 650 m²/g |
| Tap Density | 0.08 g/cm³ |
| True Density | ~2.1 g/cm³ |
| Ignited Temperature | 630 °C |
| Electrical Conductivity | > 100 S/cm |
| Thermal Conductivity | 50–200 W/m·K |
| Color | Black |
| Production Method | CVD (Chemical Vapor Deposition) |
| Carbon (C) | Oxygen (O) | Molybdenum (Mo) | Cobalt (Co) | Aluminum (Al) | Chlorine (Cl) | Free Carbon |
|---|---|---|---|---|---|---|
| 99.6% | 0.23% | 0.02% | 0.29% | 0.13% | 0.27% | 0.20% |
Applications
SWCNTs have vast potential across multiple sectors, including:
- Additives in polymers and composites
- Catalysts and catalyst supports
- Electron field emitters (e.g., for lighting and displays)
- Flat panel displays
- Gas-discharge tubes in telecommunications
- Electromagnetic shielding and wave absorption
- Energy conversion devices
- Lithium-ion battery anodes
- Hydrogen storage
- Nanotube-filled or coated composites
- Probes for STM, AFM, EFM
- Nanolithography
- Nanoelectrodes
- Targeted drug delivery
- Nano-scale sensors
- Composite reinforcement
- Supercapacitors
Frequently Asked Questions About SWCNT Dispersion
1. Can Single Walled Carbon Nanotubes (SWCNTs) disperse in water directly?
Due to their hydrophobic nature, pristine SWCNTs do not disperse well in water without surfactants or functionalization. However, they can be dispersed in water by adding dispersing agents such as SDS (sodium dodecyl sulfate) or by functionalizing their surface to introduce hydrophilic groups.
2. What is the best method to disperse SWCNTs in alcohols (e.g., ethanol, isopropanol)?
SWCNTs can be dispersed in alcohols using ultrasonication techniques. While their solubility is moderate in pure alcohols, it improves significantly with mild functionalization or by using co-solvent systems (e.g., ethanol-water mixtures).
3. Can SWCNTs be dispersed in ester solvents like ethyl acetate or methyl formate?
Yes, SWCNTs show good compatibility with certain esters, especially those with moderate polarity. Using ultrasonic agitation, stable dispersions can be achieved, particularly when combined with surface modification.
4. What is the recommended method for achieving a stable dispersion of SWCNTs?
A stable dispersion typically requires:
- Ultrasonic treatment for 30–60 minutes
- Use of dispersing agents or surfactants (e.g., SDS, Triton X-100)
- Adjustment of pH or ionic strength depending on the solvent
- Functionalization (carboxylation, hydroxylation) for long-term stability
5. Do functionalized SWCNTs disperse better than pristine ones?
Yes. Functionalized SWCNTs (e.g., –COOH or –OH groups) interact better with polar solvents, improving their dispersibility in water, alcohols, and even some esters. This also helps to reduce agglomeration and enables more consistent behavior in applications such as inks, films, and composites.
6. Is dispersion reversible? Will SWCNTs agglomerate again over time?
Without stabilizers, SWCNTs tend to re-agglomerate over time due to van der Waals forces. Proper stabilization through surfactants or functionalization can help maintain dispersion for weeks to months, depending on storage conditions.
Please contact us for bulk pricing and custom dispersion options tailored to your application.
Additional information
| Gram | 1 g, 5 g, 25 g, 100 g, 500 g, 1000 g |
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