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Multi-Walled Carbon Nanotubes

CAS Number 308068-56-6

Anode Materials, Carbon Nanotubes (CNTs), Low Dimensional Materials, Materials

Product Code M2008D6-5g
Price £110 ex. VAT

High Purity Multi-Walled Carbon Nanotubes

In powder form for applications to improve mechanical or electrical properties of materials

Overview | Product Information | Related Products

Multi-walled carbon nanotubes (MWCNTs), CAS number 308068-56-6, are a special form of carbon nanotubes in which multiple single-walled carbon nanotubes are nested inside one another. MWCNTs are useful for applications that benefit from increased dispersibility, and also enable reduced costs in synthesis and purification of these materials.

At Ossila we sell a range of MWCNT's with different purities and and diameters. Additionally, we sell carboxylic acid (COOH) and hydroxyl (-OH) functionalised nanotubes in a range of different diameters.

High Purity Multi-Walled Carbon Nanotubes

High Purity

>99.9% MWCNTs

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Reduced cost in synthesis with  308068-56-6

Low Cost

Reduced cost in synthesis

Applications of Multi-Walled Carbon Nanotubes

Versatile Applications

Improve mechanical or electrical properties

What are Multi-Walled Carbon Nanotubes?

MWCNTs consist of multiple carbon nanotubes nested within one another. The number of nanotubes that are within a MWCNT can vary - from as little as 3, to over 20. At the same time the diameter of both the internal nanotube and the external most nanotube can vary - from 2nm for the innermost tube, to over 50nm for the outer wall. Just like single-walled nanotubes, they exhibit exceptional electrical, thermal, and mechanical properties. However, due to the increased number of walls, there is a higher likelihood of defects being present compared to single-walled nanotubes - resulting in reduced performances. The outer walls of MWCNTs can be modified with functional groups such as hydroxides, carboxylic acids, or amides to produce additional functionality (e.g. improved dispersability, or the ability to attach binding sites for use in biomedical applications).

MWCNTs can be produced in high quantities and are easier to purify (in comparison to single walled and double-walled nanotubes). This makes their production costs significantly lower, and is a reason for their adoption in multiple areas of scientific research. Applications of MWCNTs have been mainly focused around their use in composites where they can be used as an additive. either to: i) improve the mechanical properties of a material, or ii) to improve the electrical properties of a material. Aside from being used as additives, functionalised MWCNTs are being utilised in a variety of medical and biotechnological applications. This is due to their high biocompatibility of carbon nanotubes and the ability to attach specific proteins to functional groups. This can provide a wide variety of targeted therapies such as drug delivery, localised heating for triggering cell death, or even miniature biosensors for in-situ measurements.

General Information

CAS Number 308068-56-6
Chemical Formula CxHy
Recommended Dispersants DI Water, DMF, THF, Ethanol, Acetone
Synonyms Multi-Walled Carbon Nanotubes, Multi Wall Carbon Nanotube, Carbon Nanotube, MWNT, MWCNT
Classification or Family 1D materials, Carbon nanomaterials, Nanomaterials, Polycyclic aromatic hydrocarbons, thin-film electronics
Colour and Appearance* Black fibrous powder

* All our MWCNTs come packed as dry powders, which can be dispersed within your solvent of choice.

Multi-Walled Carbon Nanotube Powders

Product code M2008D6 M2008D7
Internal Diameter 2 nm – 6 nm 5 – 10 nm
Outer Diameter < 8 nm 8 – 18 nm
Length 10 μm – 35 μm 10 – 30 µm
Specific Surface Area 510 m2/g 220 m2/g
Conductivity 98 S/cm 98 S/cm
Purity > 96% > 96%

COOH Functionalised Multi-Walled Carbon Nanotube Powders

Product code M2010D2 M2010D3 M2010D4 M2010D5 M2010D6
Internal Diameter 5 nm – 10nm 5 nm – 12 nm 5 nm – 15 nm 2 nm – 6 nm 5 – 10 nm
Outer Diameter 25 nm 40 nm > 50 nm < 8 nm 8 – 18 nm
Length 10 μm – 20 μm 10 μm – 20 μm 10 μm – 20 μm 10 μm – 35 μm 10 μm – 35 μm
COOH Content 0.6 wt% 0.4 wt% 0.3 wt% 3.7 wt% 2.2 wt%
Specific Surface Area > 55 m2/g > 30 m2/g > 30 m2/g > 510 m2/g 210 m2/g
Conductivity N/A N/A N/A 98 S/cm 98 S/cm
Purity > 99.9% > 99.9% > 99.9% > 96% > 96%

OH Functionalised Multi-Walled Carbon Nanotube Powders

Product code M2011D2 M2011D3 M2011D4 M2011D5 M2011D6
Internal Diameter 5 nm – 8 nm 5 nm – 12 nm 5 nm – 15 nm 2 nm – 6 nm 5 – 10 nm
Outer Diameter 25 nm 40 nm > 50 nm < 8 nm 18 – 28 nm
Length 10 μm – 20 μm 10 μm – 20 μm 10 μm – 20 μm 10 μm – 35 μm 10 – 30 µm
OH Content 0.5 wt% 0.5 wt% 0.4 wt% 5.8 wt% 1.7 wt%
Specific Surface Area > 30 m2/g > 30 m2/g > 20 m2/g 510 m2/g 120 m2/g
Conductivity N/A N/A N/A 98 S/cm 98 S/cm
Purity > 99.9% > 99.9% > 99.9% > 96% > 96%

* For larger orders, please contact us to discuss prices.


Batch Quantity Price
M2008D6 5 g £110
M2008D6 10 g £175
M2008D6 25 g £350
M2008D6 50 g £560
M2010D5 1 g £64
M2010D5 5 g £250
M2010D5 10 g £390
M2010D2 500 mg £105
M2010D2 1 g £160
M2011D5 1 g £64
M2011D5 5 g £250
M2011D5 10 g £390
M2011D2 500 mg £105
M2011D2 1 g £160
M2011D2 5 g £580

Dispersion Guide

Like single walled carbon nanotubes, MWCNT's are insoluble. For dispersing in aqueous solutions we recommend the use of sodium dodecylbenzene sulfonate if an ionic surfactant is suitable if a nonionic surfactant is needed we recommend surfactants with high molecular weights.

  • Weigh out the desired amount of nanotubes.
  • Mix together your solvent and surfactant of choice at the desired surfactant concentration. This should be below the critical micelle concentration of the surfactant.
  • Add the solvent-surfactant mix to the dry powder and shake vigorously to mix.
  • Either place an ultrasonic probe into the solution or place the solution into an ultrasonic bath. Be careful about the length of time and power used, as damage to the carbon nanotubes can occur, shortening their average length.
  • The resulting solution will be a mixture of suspended nanotubes and bundles of nanotubes, further sonication will help break up the bundles.
  • To separate out the individual nanotubes in solution from the bundles the solution should be placed within a centrifuge. If the solution is centrifuged for a longer time and/or at a higher the smaller bundles will be removed narrowing the distribution of suspended nanotubes.

For functionalised nanotubes it is possible to disperse them without the use of any surfactants. However, the total concentration of dispersed nanotubes will be lower. A maximum of 0.1mg/ml can be achieved for COOH and OH.

MSDS Documents

Multi-walled carbon nanotube MSDSMulti-Walled Carbon Nanotube MSDS Sheet

Multi-walled carbon nanotube COOH functionalised MSDSMulti-Walled Carbon Nanotube COOH Functionalised MSDS Sheet

Multi-walled carbon nanotube OH functionalised MSDSMulti-Walled Carbon Nanotube OH Functionalised MSDS Sheet


  1. Thermal and Electrical Conductivity of Single and Multi-Walled Carbon Nanotube-Epoxy Composites, A Moisala, Compos. Sci. Technol., 66, 1285-1288 (2006) DOI: 10.1016/j.compscitech.2005.10.016
  2. 99.9% Purity Multi-Walled Carbon Nanotubes by Vacuum High-Temperature Annealing, W. Huang, et. al., Carbon, 41, 2585-2590, (2003) DOI: 10.1016/S0008-6223(03)00330-0
  3. Elastic Moduli of Multi-Walled Carbon Nanotubes and the Effect of Van der Waals Forces, C. Li, et. al., 63, 1517-1524, (2003) DOI: 10.1016/S0266-3538(03)00072-1

We stock a wide range of low dimensional materials available to purchase online. Please contact us if you cannot find what you are looking for.

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