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T. Bohnenberger, J. Matovic, U. Schmid:
"Thin Catalyst Layers Based on Carbon Nanotubes for PEM-Fuel Cell Applications";
Talk: Smart Sensors, Actuators, and MEMS V, Prag; 04-18-2011 - 04-20-2011.

In this study, two approaches are compared to develop thin, multifunctional films of carbon nanotubes (CNT) which are targeted to serve as a catalyst layer in fuel cells. The first is based on the direct deposition of mixed multi- and single-wall CNTs on metalized silicon wafers, using the metallization as a sacrificial layer to
subsequently detach the CNT film from the substrate. It is a less time consuming and a straight forward method compared to the alternative under investigation, the layer-by-layer technique (LbL). The LbL uses bilayers of charged nanotubes to slowly build up a film with an exactly defined thickness. The process is well controlled,but the time constants for deposition of each bilayer are rather high (i.e. about 1 h). With additional annealing steps implemented during film generation this method, however, is regarded advantageous as membranes results with improved mechanical stability and a good homogeneity.

http://dx.doi.org/10.1117/12.885861