Berlin 2005 – scientific programme

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DS: Dünne Schichten

DS 23: Postersitzung I

DS 23.9: Poster

Friday, March 4, 2005, 16:00–18:30, Poster TU B

Growth, microstructure and mechanical properties of carbon nanoflake spherules — •Naigui Shang, Thorsten Staedler, and Xin Jiang — Lehrstuhl für Oberflächen und Werkstofftechnologie, Insitut für Werkstofftechnik, Universität Siegen, Paul-Bonatz-Straße 9-11, D-57068 Siegen, Deutschland

Carbon based nanostructures including carbon nanotubes, nanofibers, nanocones, nanoparticles, nanoflakes and nanohorns etc. have received much attention recently due to their unique structures, novel properties and potential applications. As a novel structure, carbon spherules have been synthesized by microwave plasma enhanced chemical vapor deposition using a mixture gas of methane and nitrogen on the steel substrates. The as-deposited carbon spherules consist of a high density of interlaced carbon nanoflakes arranged in a radial mode from their cores. The size and density of the carbon spherules strongly depend on the deposition conditions. A possible growth mechanism of the carbon nanoflake spherules is presented based on the metal catalytic effect. Nanoindentation measurements of the individual carbon spherule with various loadings show that they have unique mechanical properties quite different from other carbon nanostructures.