Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 46: Poster 2

HL 46.5: Poster

Thursday, March 29, 2007, 15:00–17:30, Poster A

High purity single step catalyst particle preparation for the carbon nanotube synthesis — •Franziska Schäffel, Christian Kramberger, Mark Rümmeli, Daniel Grimm, Thomas Gemming, Thomas Pichler, Bernd Büchner, Bernd Rellinghaus, and Ludwig Schultz — IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany

Many applications of carbon nanotubes (CNTs) are impeded by a lack of control in positioning and orienting CNTs on substrates. Advances have been made by using catalyst thin films prepared and patterned by shadow masking [1] or lithography [2]. Yet, such thin film techniques do not offer concurrent control of the size, size distribution, and areal density of the catalyst particles. We present a versatile route to prepare individual nanoparticles in the gas phase by sputtering from a high purity iron target. The route is advantageous in that the preparation of the catalyst particles is accomplished in a single step. The achievable degree of purity is very high as compared to processes where the catalyst preparation requires a series of chemical procedures (see, e.g., [3]). The separate preparation of catalyst and CNTs allows for an effective control of the particle size and density and offers the opportunity to characterize the starting material which cannot be so readily achieved in more conventional CVD processes where the catalyst particles form in situ. [1] L. Delzeit et al., J. Phys. Chem. B 106 (2002) 5629. [2] J. Kong et al., Nature 395 (1998) 878; A.J. Hart et al., J. Phys. Chem. B 110 (2006) 8250; M.S. Kabir et al., Nanotechnology 17 (2006) 790. [3] R.D. Bennett et al., Adv. Mater. 18 (2006) 2274.