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Perfect Carbon nanotubes (CNTs) is ideal nano materials for electronics and thin film application. Recently, it is demonstrated that CNTs can be growth in super-long and perfect structure, it can exhibits excellent electronic and mechanical properties. They are therefore considered as potential materials for flexible electronics application.
We developed a general strategy for fabrication of super-long perfect carbon nanotube by carefully control the operating conditions, and minimalized the deactivation of the catalyst. The super-long CNTs can be more than half meter in length. We realize the visualization and manipulation of individual super-long carbon nanotubes under optical microscopes by deposition of TiO2nanoparticles on them. The CNTs over 1 mm in length exhibited 120 GPa strength, over 1.2 TPa Young’s modulus, and 17% breaking strain. The superlubricity can be realized in centimetres-long perfect double-walled carbon nanotubes (DWCNTs) under ambient conditions. Centimetres-long inner shells can be pulled out continuously from such nanotubes, with an intershell friction lower than 1 nN that is independent of nanotube length. The shear strength of the DWCNTs is only several pascals, four orders of magnitude lower than the lowest reported value in CNTs and graphite. The perfect structure of the super-long DWCNTs used in our experiments is essential for macroscale superlubricity.
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