Modified fluidised floating catalyst thermal CVD method for preparing carbon nanotubes using Fe/Co/Al

Abstract

AbstractCarbon nanotubes (CNTs) have been successfully prepared at a low temperature of 650°C by using the fluidised floating catalyst method. Optimum concentration for Fe/Co/Al has been found to be around 0·75% for the best yield. Carbon nanotubes are produced from the evaporation of part of the precursor (camphor oil) which decomposes in situ and aggregates on the metal alloy catalyst particles present in the evaporating boat. Since the metallic alloy was obtained by calcining the respective nitrates, it is expected to have residual entrapped nitrogen which may bond with the depositing CNT. Fourier transmission infrared spectra confirm the presence of nitrogen in the prepared nanotubes which is stipulated to be embedded on the carbon surface in the form of C-N bonding instead of intercalating within the nanotubes.Keywords: CARBON NANOTUBESFLUIDISED FLOATING CATALYST METHOD