J-E characteristics of Ni-catalysed multiwalled carbon nanotubes
by Zishan H. Khan, Samina Khan, M. Husain, Numan Salah, Sami Habib, Shamshad Ahmad Khan
International Journal of Nano and Biomaterials (IJNBM), Vol. 2, No. 1/2/3/4/5, 2009

Abstract: A catalytic decomposition of hydrocarbons involving N₂, C₂H₂ and H₂ gas mixtures is used to synthesise the Ni catalysed carbon nanotubes (CNTs). These CNTs are grown on nanocrystalline film of nickel using low-pressure chemical vapour deposition (LPCVD). During the synthesis of these nanotubes, the growth temperature and growth time is kept at 700°C and 30 minutes respectively. The pressure in LPCVD chamber is maintained at 10 Torr. FESEM and HRTEM are employed to study the growth mechanism of these as grown CNTs. FESEM images suggest that these CNTs are very long and their diameter varies from 10-50 nm. It is also confirmed from HRTEM image that these nanotubes are multiwalled with the diameter varying from 10-50 nm and length of several micrometers. It is clear from SEM mage that the inner and outer tube diameter of these CNTs is 5 nm and 12 nm respectively. On the basis of J-E characteristics, it is observed that these multiwalled carbon nanotubes (MWNTs) show a turn-on field of 6.23V/μm, when the current density achieves 5μA/cm² and the field enhancement factor is estimated to be 5.41 × 10 ⁶cm⁻¹.

Online publication date: Sat, 08-Aug-2009

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