Synthesis of Carbon Nanotubes Using Ni95Ti5 Nanocrystalline Film as a Catalyst
Authors: Khan, Samina; Khan, Zishan H.; Tripathi, K.N.; Husain, M.
Source: Journal of Nanoscience and Nanotechnology, Volume 7, Number 6, June 2007 , pp. 1855-1859(5)
Publisher: American Scientific Publishers
Abstract:Carbon nanotubes (CNTs) were synthesized by low-pressure chemical vapour deposition (LPCVD) using N2:C2H2:H2 gas mixtures on nanocrystalline Ni95Ti5 film. This nanocrystalline film was deposited on silicon substrate using vapour condensation method. The growth temperature and growth time was kept at 800 °C and 30 mins, respectively and the pressure was maintained at 10 Torr. The growth mechanism of CNTs was investigated using FESEM, TEM, HRTEM, and Raman Spectroscopy. From FESEM image of Ni95Ti5 nanocrystalline film, it is clear that the particle size varies from 5-10 nm. EDX analysis suggests that Ni95Ti5 alloy contains Ni and Ti both. It is clear from TEM images that CNTs are multiwalled with the diameter varying from 10-30 nm and length of several micrometers. HRTEM image shows that the structure of these multi-walled nanotube (MWNTs) is bamboo-shaped and the catalyst exists at the tip of MWNTs. Fourier Transform Raman Spectroscopy confirmed that graphitic structure of as-prepared CNTs. Field emission measurements reveal that the carbon nanotubes grown for 30 mins showed a turn-on field of 7.2V/μm, when the current density achieves 10 μA/cm2. The field enhancement factor was calculated to be 708.50 for carbon nanotubes grown for 30 mins.
Document Type: Research article
Publication date: 2007-06-01
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