Abstract
In this study, we describe the synthesis of carbon nanotubes (CNTs) by chemical vapor deposition at 500°C to 975°C, over Co3O4/MgO catalyst. The size of Co3O4 nanoparticles is controlled by changing cobalt nitrate concentration in aqueous solution by impregnation method. The main object of this study is the synthesis of CNTs that started suddenly without any preheating of catalyst nanoparticles. The effect of sudden initiation and conventional preheating processes of catalyst nanoparticles on yield of CNTs was then described. The results suggest that this sudden initiation of synthesis process affects the carbon yield and morphology of CNTs.
Highlights
The unique and exemplary physical properties of carbon nanotubes (CNTs) have spurred interest in a wide range of applications including nanoelectronics, nanocomposites, and gas storage [1,2]
In order to investigate the effect of the catalyst's sudden initiation to the reaction zone of the chemical vapor deposition (CVD) furnace on the growth of CNTs, carbon yield in two different mentioned methods was compared
For temperatures higher than 800°C and contents more than 30 wt.%, carbon yield decreases rapidly in the first method compared with that in the second one wherein higher carbon yield is achieved. This can be a result of thermal shock, caused by the sudden entrance of catalyst in the reaction zone with high temperature, which crumbles the aggregated catalyst nanoparticles
Summary
The unique and exemplary physical properties of carbon nanotubes (CNTs) have spurred interest in a wide range of applications including nanoelectronics, nanocomposites, and gas storage [1,2]. Different growth techniques exist to synthesis the CNTs, such as arc discharge and chemical vapor deposition (CVD). Good quality, and high degree of control of the CNTs can be obtained by the catalytic CVD techniques [3]. Scientific groups dealt with the mechanism of the formation of carbon nanotubes. The study shows that the yield of CNT preparation significantly depends on metal particles on supported catalysts. Increase of catalyst nanoparticle loading and good dispersion are useful ways to obtain a high yield of CNTs [8,9,10]
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