Abstract
Carbon nanotubes (CNTs) were grown for 30 min over impregnated Co/MgO, Mo/MgO, and Co–Mo/MgO catalysts by thermal cracking of C 2H 2 at 800 °C. 30Mo/70MgO catalyst was inactive in growing CNTs. However, the addition of Mo to Co greatly enhanced the growth of CNTs. The highest yield was observed over 15Mo/15Co/70MgO catalyst. The grown tubes were multi-wall carbon nanotubes (MWNTs) with average diameter of 15 nm. The growth was followed by tip growth mode. Purified CNTs contained more than 90% MWNTs. Co oxide precursor was released from the CoMoO 4 species at growth temperature and participated in the CNTs growth. The field emission characteristics of the grown CNTs showed that the turn-on-voltage appeared at the electric field of 3.17 V/μm with the calculated field enhancement factor ( β) of 5054. The observed β value indicated better suitability of our grown CNTs for the field emission display (FED) application.
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