Purification strategies and purity visualization techniques for single-walled carbon nanotubes

  title={Purification strategies and purity visualization techniques for single-walled carbon nanotubes},
  author={Tae-Jin Park and Sarbajit Banerjee and Tirandai Hemraj-Benny and Stanislaus S. Wong},
  journal={Journal of Materials Chemistry},
Traditionally, SWNTs have been prepared by electric arc-discharge, laser ablation, or chemical vapor deposition (CVD) methods, yielding tubes of various diameter and length distributions. However, without exception, as-prepared SWNTs are contaminated with a number of impurities, decreasing the overall yield of usable material. Impurities include transition metal catalysts, such as Fe, Co, and Ni, which are necessary for the growth of SWNTs as well as carbonaceous species such as amorphous… 

Synthesis and Purification of Carbon Nanotubes

This chapter will evaluate the synthesis and purification of carbon nanotubes and discuss the advantages and disadvantages of these purification routes to help researchers in selecting appropriate and effective method.


Carbon nanotubes (CNTs) are allotropes of carbon with a nanostructure that can have a length-to-diameter ratio greater than 1,000,000. Different types of carbon nanotubes can be produced by different

X-ray Analysis for Purification Process of Synthesized Multi-Walled Carbon Nanotubes by Chemical Vapor Deposition

In this work we report method that can be used for the purification of multiwall carbon nanotubes (MWNT) obtained by the CVD chemical vapor deposition method. The purification of multiwall carbon

Controlled carboxylic acid introduction: a route to highly purified oxidised single-walled carbon nanotubes

A chemical treatment for preparing high purity selectively oxidised SWNTs while preserving optical/electronic properties of the material has been developed. Efficient removal of both metal and

Effect of centrifugation on the purity of single-walled carbon nanotubes from MCM-41 containing cobalt

Centrifugation is applied to purify single-walled carbon nanotubes (SWCNTs) grown from MCM-41 containing cobalt (Co-MCM-41) catalysts by chemical vapor deposition. We demonstrated that an optimized

Protecting Carbon Nanotubes from Oxidation for Selective Carbon Impurity Elimination

Purity of carbon nanotubes (CNTs) is essential to avoid a dramatic decrease in their performances. In addition to metallic impurities, carbonaceous impurities have been shown to be responsible for

Synthesis and Purification of Carbon Nanotubes

Over the last one and a half decades, a great amount of research on the synthesis of carbon nanotubes has been carried out [1–5] since the first pioneering report of the discovery of multiwalled



Purification and Characterization of Single-Wall Carbon Nanotubes (SWNTs) Obtained from the Gas-Phase Decomposition of CO (HiPco Process)

A purification method is given for extracting the Fe metal catalyst and non-SWNT carbon from nanotubes produced by the HiPco process.1,2 A multistage purification method has been investigated. Sample


A purification procedure for single-wall carbon nanotubes (SWNTs) prepared by pulsed laser ablation is discussed, which separates coexisting carbon nanospheres (CNS), metal nanoparticles,

Purification and Characterization of Single-Wall Carbon Nanotubes

A purification method has been developed that provides for the removal of metal catalysts and impurity carbon from laser-oven-grown single-wall carbon nanotube (SWNT) material. The oxidation rate of

Purification of HiPCO carbon nanotubes via organic functionalization.

Organic functionalization makes the SWNT more easy to handle, which results in a better manipulation for potential practical uses and leads to high-purity materials.

Controlled multistep purification of single-walled carbon nanotubes.

The purity and yield of SWNTs are improved due to reduced catalytic activity of the iron oxide and greater iron oxide removal also resulted from oxidation at higher temperatures.

Purification of Single-Wall Carbon Nanotubes by Selective Microwave Heating of Catalyst Particles

A new scalable method for purification of single-wall carbon nanotubes (SWNTs) by using microwave heating in air is developed. The microwaves couple to the residual metal catalyst, raising

Controlled Purification of Single-Walled Carbon Nanotube Films by Use of Selective Oxidation and Near-IR Spectroscopy

Electric-arc produced as-prepared single-walled carbon nanotube (AP-SWNT) films have been purified by a selective oxidation process. The purification is monitored by near-infrared (NIR) spectroscopy,

Rational Sidewall Functionalization and Purification of Single-Walled Carbon Nanotubes by Solution-Phase Ozonolysis

A dispersion of raw HiPco single-walled carbon nanotubes in methanol has been subjected to ozonolysis at −78 °C, followed by treatment with various reagents, in independent runs, to generate a higher

Gas-Phase Purification of Single-Wall Carbon Nanotubes

A gas-phase purification method for raw nanotube material has been developed which incorporates a chlorine, water, and hydrogen chloride gas mixture to remove unwanted carbon. The evolved gases can