Single Walled Carbon Nanotubes

Single Walled Carbon Nanotubes

Single Walled Carbon Nanotubes are hollow, cylindrically shaped allotropes of carbon that have a high aspect ratio (length to diameter ratio). Their name is derived from their structure and the walls are formed by multiple one-atom-thick sheets of carbon. SWNTs consist of a single rolled layer of carbon atoms held together in a tube structure by Van der Waals forces. Depending on the chiral angle of how the tube is formed, they are considered semiconducting or metallic in nature. They’re inert and can be used to increase mechanical and conductive properties in other materials.

types-of -Single-Walled-Carbon-Nanotubes
Types of Single Walled Carbon Nanotubes

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Please Note- SWNTs can’t be produced homogeneously by CCVD, they always contain significant DWNTs content. For this reason we call all of our former SWNT products a SW-DWNT mix. We can supply Hipco which are true single walls upon request.

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Single Walled Carbon Nanotubes

Single Walled Carbon Nanotubes (SWCNTs) are defined as a carbon nanotube consisting of a single tube of carbon atoms arranged in a hexagonal pattern with isolated 5 and 6 member rings. There are different types because the graphitic sheets can be grown with different chiral angles during synthesis.

SWCNTs are an important variety of carbon nanotubes because most of their properties change significantly with differing (n,m) values. In particular, their band gap can vary from zero to about 2 eV and their electrical conductivity can show metallic or semiconducting behavior.

True SWCNTs are 0.7-1.2nm outer diameter and can be anywhere from 0.5-30um long. Longer ones are available in array form, up to 500um.

single-walled-double-walled-carbon -nanotubes-molecular-structure
molecular structure

Single Walled Carbon Nanotubes Structure

There are three types of structures, Zigzag, Armchair, and Chiral. It’s possible to recognize zigzag, armchair, and chiral nanotubes just by following the pattern across the diameter of the tubes, and analyzing their cross-sectional structure.

Single Walled Carbon Nanotube Chiral Models
Chiral Models
single-walled-carbon-nanotubes-chiral-structure
chiral structure

Single Walled Carbon Nanotubes Properties

Their desirable properties include high strength as well as high electrical and thermal conductivity.

They are very resilient. When bent, they buckle but do not break. In fact, they can easily be straightened out without any damage to their physical structure. Their Young’s modulus ranges from 1.28 – 1.8 TPa (tera pascals). One tera pascal is a pressure of about seven orders of magnitude greater than atmospheric pressure. The Young’s modulus of steel is 0.21 TPa, which means the Young’s moduli of CNTs are typically ten times greater than that of steel.
Electrical conductivity is determined by their chiral structure, diameter, and length.  A diameter in the nanometer range gives rise to quantum effects and they can either be conducting or semiconducting, depending on their chirality. SWCNTs are metallic if the integers of equation (1) are: n=m (the armchair structure) and n-m=3i (where i is an integer). All other structures are semiconducting. Their geometry determines the band structures and the energy band gap.
Their thermal conductivity is about 3400 W/m K near 300 K

What’s the difference between single walled and multi walled carbon nanotubes?

A SWCNT has just one wall. True SWCNTs are typically made by HIPCO or Arc methods. A multi walled carbon nanotubes are tubes inside of other tubes as shown in the image below. MWCNTs can have different chiral structures within the same CNT.

the-difference-between-single-walled-and-multi-walled-carbon-nanotubes

Single Walled Carbon Nanotubes Applications

Applications include advanced electrodes, conductive films and coatings (including transparent conductive coatings), solar, and sensor applications.

SWCNTs have been applied  as the most basic building block of these systems is the electric wire, and with diameters of an order of a nanometer can be excellent conductors. A useful application of SWNTs is in the development of the field-effect transistors (FET). The first intermolecular logic gate using SWCNT FETs was made in 2001.  A logic gate requires both a p-FET and an n-FET. Because SWNTs are p-FETs when exposed to oxygen and n-FETs otherwise, it is possible to expose half of an SWNT to oxygen and protect the other half from it. The resulting SWNT acts as a not logic gate with both p and n-type FETs in the same molecule.

Single Walled Carbon Nanotubes Price

Our SWNTs prices are $75-$300/g depend on purity and surface functionality.

Publications using SWNTs from Cheap Tubes Inc

Removal of bisphenol A from landfill leachate using SWCNTs

Transport of SWCNTs in Porous Media: Filtration Mechanisms and Reversibility

Poly(γ-benzyl-L-glutamate)-functionalized SWCNTs from surface-initiated ring-opening polymerizations of N-carboxylanhydride

Single Walled Carbon Nanotubes Synthesis Methods

SWCNTs are grown by arc method (hipco), laser method, & chemical vapor deposition methods.

Arc & laser method provide substantially single walled product however they are cost prohibitive to use commercially.

Chemical Vapor deposition does produce very nice SWNTs however there is always substantial double walled nanotube content.

For this reason we call our CVD SWNTs a single walled-double walled carbon nanotube mix.

Single Walled Carbon Nanotubes Raman Spectra

Single-Walled-Carbon-Nanotubes-90s-Raman-Spectra
Single Walled Carbon Nanotubes 90% Raman Spectra

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