Low temperature growth of double walled carbon nanotubes using FeMoMgO catalyst

The chemical vapour deposition technique was utilised to grow the double walled carbon nanotubes (DWCNTs) over FeMoMgO catalyst at low temperature (550 degrees C) under the mixture of argon, hydrogen and acetylene gas. Thermogravimetric analysis revealed that synthesised nanotubes have thermal stability and high purity. The high-resolution transmission electron microscopy image showed the formation of DWCNTs with tube diameter of 2.5-3.5 nm. We observed radial breathing mode (RBM) in Raman spectrum, which is related to the diameter of DWCNTs. This synthesis process is simple and economically viable ascribed to low synthesis temperature, simplicity and well graphitization with high yield.