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MM: Fachverband Metall- und Materialphysik

MM 33: Nanomaterials II - Tubular nanostructures

MM 33.2: Vortrag

Dienstag, 1. April 2014, 16:00–16:15, IFW A

Growth of periodic arrays of perpendicularly aligned multi-walled carbon nanotubes — •Eser Metin Akinoglu, Anthony John Morfa, and Michael Giersig — Freie Universität Berlin, Department of Physics, Berlin, Germany

Multi-walled carbon nanotubes (MWCNTs) are promising nano materials with unique properties such as their extraordinary mechanical strength and their electrical conductivity. Using a combination of nanosphere lithography (NSL) for catalyst nano-patterning and plasma enhanced chemical vapor deposition (PECVD) for perpendicularly aligned growth we can produce different MWCNT systems. NSL utilizes a hexagonally close packed monolayer of submicron polystyrene spheres (PSS) as a lithography mask for metal deposition. A periodic array of triangular shaped metal islands remains after chemically removing the PSSs. The size and distance in between the metal islands can be tuned by enlarging or shrinking the hexagonal unit cell which can be tuned through the used PSS size. In the PECVD of MWCNTs a vapor-liquid-solid growth process is used where nickel acts as a catalyst and as a protective helmet during ion bombardment for perpendicular MWCNT growth. By changing the catalyst pretreatment, plasma conditions, growth temperature, gas composition and growth time of the PECVD process we can vary the MWCNT growth kinetics yielding vastly different results in terms of shape, size and crystalinity. In this presentation we show the optimization of parameters for MWCNT growth and discuss potential bio and energy applications such as antimicrobial surfaces and field emitter arrays.