[Zurück]

T. Bohnenberger, J. Matovic, U. Schmid:
"Comparison of Drop Deposition and Layer-by-layer Approach to Form Thin Carbon-nanotube-membranes as Catalyst Layer in Fuel Cells";
Vortrag: 4M 2011 - 8th International Conference on Multi-Material Micro Manufacture, Stuttgart, D; 08.11.2011 - 10.11.2011; in: "4M 2011 - Proceedings of the 8th International Conference on Multi-Material Micro Manufacture", Research Publishing, (2011), ISBN: 978-981-07-0319-6; S. 234 - 237.

In this study two different approaches to make thin multifunctional membranes of carbon nanotubes will be compared. The membranes can be used to form a catalytic layer in a proton exchange membrane fuel cell. The most straight forward method is to directly depose drops of previously dispensed nanotubes on a Si-substrate. For easy release of the membrane the substrate is coated with an additional hydrophilic sacrificial layer, in this case a sputter deposited thin Al-film. The advantages of this method are the easy handling of the process and
short fabrication times. But, there is a high probability of pin-hole generation within the membrane if it undergoes a thickness of approximately 6 μm. In contrast, the layer-by-layer deposition technique follows a bottom-up approach, making subsequently bilayers of functionalized nanotubes attached by electrostatic forces. This
method provides the possibility to control the layer thickness very precisely and to achieve a minimal defect density. Like every step-by-step method, the processing time depends on the final thickness which can be disadvantageous when targeting thicker membranes.

Fuel cell, carbon nanotubes, layer-by-layer

http://dx.doi.org/10.3850/978-981-07-0319-6