Synthesis of double-walled carbon nanotubes (DWNTs)
10 November 2007There are various synthesis techniques for double-walled carbon nanotubes, however the most common synthesis technique is arc-discharge technique. In this technique double-walled carbon nanotubes are prepared by using an arc in an atmoshphere of hydrogen and argon at 350 torr. Catalyst for synthesis is prepared by heating Ni, Co, Fe and S powders in an inert atmoshphere at 500 degree centigrade.
In the above synthesis technique double-walled carbon nanotubes (DWNTs) is predominantly obtained. These DWNTs have an outer diameter in the range of 1.9 - 5.0 nm and inner diameter in the range of 1.1 - 4.0 nm. Researchers have also synthesized double-walled carbon nanotubes (DWNTs) by hydrogen arc discharge technique using multi-wall carbon nanotubes or carbon nanofibres as feedstcok and found that the double-wall carbon nanotubes thus produced have higher purity than that produced from graphite powders.
High purity double-walled carbon nanotubes (DWNTs) can also be produced by high temperature pulsed arc-discharg technique. The temperature in this technique is kept very high at about 1250 degree centigrade and Y/Ni alloy is used as catalyst. The double-walled carbon nanotubes produced by this technique have an inner and outer diameter in the range of 0.8-1.2 nm and 1.6-2.0 nm respectively.
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