Evaluation of new processes to achieve a high yield of carbon nanotubes by CVD method

Abstract

In this study, we describe the synthesis of carbon nanotubes (CNTs) by chemical vapor deposition at 500°C to 975°C, over Co 3 O 4 /MgO catalyst. The size of Co 3 O 4 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.

Enhanced Adsorption of Cu(II) and Ni(II) ions from animal feeds processing industry wastewater by Reusable Mesoporous Palladium-Silver-Carbon nanotubes Composite

“…3(a) that the UVvisible spectrum of the synthesised AgNPs falls within the maximum range of absorption spectra of 400-500 nm due to surface plasmon resonance effect [41] . This is line with the range reported for a typical AgNPs [40][41] . A slight shift in the plasmonic peak of Ag may be linked to particles destabilization or depletion of stable Ag nanoparticles which ultimately led to reduced intensity.…”

“…and the appearance of the peaks (Fig. 3a) may be ascribed to surface plasmonic resonance of silver [40] This occurs due to mutual oscillation of the conduction electrons on the surface of the Ag nanoparticles when they align in resonance with the irradiated light of the wave. The combined oscillation of free electrons within the Ag nanoparticles and the surface resonance permit the scattering and absorption of light at a particular frequency, and thus, provide the characteristic colour of the produced nanoparticles.…”

“…The synthesis of carbon nanotubes was carried out using catalytic chemical vapour deposition method. The procedure described by Aliyu et al [40] was followed for the CNTs synthesis. A known mass of the prepared Fe-Ni/Kaolin catalyst was weighed and spread uniformly in a quartz boat and placed at the center of a quartz reactor horizontally in an electrical tubular furnace.…”