Title Modular teaching and learning offers for contemporary and needed further education
Project Number D/04/B/F/PP-146 157
Product Influence of co-catalyst on growth of carbon nanotubes using alcohl catalytic cvd method
Title Influence of co-catalyst on growth of carbon nanotubes using alcohl catalytic cvd method
Product Type modules
This module describes the influence of a co-catalyst on growth of carbon nanotubes by Alcohol Catalytic Chemical Vapour Deposition (ACCVD) method. Silicon wafers covered with thermal oxide or polycrystalline diamond thin film were used as substrates. Ni thin film supported with Al, Cu or Ti was used as a catalyst. The films were deposited by Pulsed Laser Deposition Technique. Comparison of the various types of the co-catalyst (Al, Cu, Ti) leads to the conclusion that Cu co-catalyst is suitable for producing very thin single wall carbon nanotubes (SWCNTs) and combination of Al and Ni provide a good condition to the catalytic grown of CNTs. In addition, we observed also the influence of the various diffusion barriers (thermal oxide and polycrystalline diamond) on growth of CNTs. Prepared samples were analysed by Raman Spectroscopy (RS) and Scanning Electron Microscopy (SEM).
Research centre, universities, industry
We have demonstrated the influence of a co-catalyst on growth of CNTs by ACCVD method. Comparison of the various types of co-catalyst (Al, Cu, Ti) lead to the conclusion that Cu co-catalyst is suitable for producing very thin CNTs (perhaps single-wall), but with very low efficiency and moreover Cu clusters are not stable during the growth temperature. Other co-catalysts are relatively stable in the surface of the substrate and positively influence growth of CNTs. The highest catalyst efficiency of CNT growth was achieved for samples with Al co-catalyst. This prove that Al and Ni provide good conditions to the catalytic grown of CNTs. However the interactions between atoms and oxide layer are much weaker than in case of diamond layer and so atoms can freely move and diffuse into larger clusters; in addition the diamond layer is much rougher than oxide layer, which may also play a role in the forming of clusters.
Area of application
Cold Emitters, LCD
Specialize vacuum technology lab