Novel carbon materials with nanometer dimensions are of potentially significant importance for a number of advanced technological applications. Within this report we describe the results for the electrochemical characterization of a series of single walled carbon nanotube (SWNT) metal supported catalysts as cathodes for basic fuel cell systems. Compared to the typical carbon black electrocatalysts, the nanotube supported platinum catalyst resulted in up to a 140% improvement in the efficiency for a proton exchange membrane (PEM) fuel cell.

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AuCeNiAu and PdGeAu contacts to InP based HEMT structures are examined. Standard, non-recessed, TLM structures do not accurately represent contact resistance when there is high interfacial resistance between InGaAs and InAIAs. A mathematical model using distributed resistance is reviewed. Three new TLM structures derived from the model are shown and new methods for measuring contact resistance are given.Different metal schemes were evaluated and different layer thicknesses within a given metal scheme were also compared using statistically designed experiments. PdGeAu was found to be consistently better for ohmic contacts than AuGeNiAu. The optimum thicknesses found in the PdGeAu system were l50A of Pd and 500A of Ge.