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The Effect of Temperature on Carbon Nanotubes Grown Using Monometallic Catalyst from Palm Oil Precursor

The effects of temperature on carbon nanotubes (CNTs) by thermal chemical vapor deposition (TCVD) method were systematically studied. Natural hydrocarbon source; palm oil was used as precursor and argon as carrier gas. Palm oil vaporized optimally at 450oC in ambient pressure. The synthesis temperature start at 650°C and were increased at rate of 50°C for series of samples until it reaches maximum temperature of 900°C. The samples were grown on nickel nitrate, which was coated on silicon substrate. The CNTs characteristics were studied using field emission scanning electron microscopy (FESEM), Raman and infrared (IR) spectroscopy. The experimental results revealed that CNTs properties are highly dependent on temperature. It was found that with increasing synthesis temperature, the CNTs diameter decreased initially and then increased after passing an optimum synthesis temperature of 750°C. The bamboo like structure were obviously found at higher synthesis temperature 800°C-850°C while there were few CNTs seen at 900°C.