Thermodynamics approach of the formation of Ni catalyst particles for carbon nanotubes growth |
| |
Authors: | S Sanjabi A Faramarzi ZH Barber |
| |
Institution: | a Department of Materials Science and Engineering, Tarbiat Modares University, P.O. Box 14115-143, Tehran, Iran b Department of Materials Science and Metallurgy, Cambridge University, Pembroke Street, Cambridge CB2 3QZ, UK |
| |
Abstract: | Size-dependent thermodynamic parameters, such as Gibbs free energy, enthalpy and entropy, for the transition of a Ni nanofilm to catalyst particles for subsequent carbon nanotube growth have been explored. In this investigation, we consider the derived equations of the size-dependent melting temperature of nanosolids based on our previous works. Using this thermodynamic approach, it is found that the diameter of Ni particles is 3 times greater than the thickness of the original film. From the critical and stable sizes of transformed Ni nanoparticles, a minimum film thickness for transformation of film to nanoparticles was obtained. Our predictions are in good agreement with experimental results. |
| |
Keywords: | A Thin films A Nanostructures B Vapour deposition D Thermodynamic properties D Phase transitions |
本文献已被 ScienceDirect 等数据库收录! |
|