Oxidation resistance of multi-walled carbon nanotubes purified with sulfuric and nitric acids
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Discovered by Iijima in 1991 , carbon nanotubes (CNTs) have been attracting increasing research interests due to their exceptional physical, chemical and mechanical properties. CNTs have shown application potentials in the field of composite reinforcements, display panels, nano-devices and hydrogen storage . A number of research efforts [3, 4, 5, 6, 7, 8, 9] have focused on the purification of CNTs because as-prepared CNTs often contain impurities, such as amorphous carbon, catalyst metals, and fullerene or graphite particles. Among the abundant purification methods, refluxing in concentrated H2SO4/HNO3 (3:1) have been considered facile for the selective removal of impurities from CNTs with little destruction of tube walls [3, 4].
In some cases, high temperature gasification is needed after CNTs are refluxed in H2SO4 and/or HNO3. Delpeux et al.  treated single walled carbon nanotubes (SWCNTs) under CO2at 525 °C in order to remove the debris of disordered carbon after SWCNTs...
KeywordsFullerene Gasification Oxidation Resistance Amorphous Carbon Catalyst Metal
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