Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster Session

MM 15.33: Poster

Montag, 11. März 2013, 18:00–20:00, Poster E

Percolated Pd thin films for hydrogen sensors — •Magnus Hamm, Stefan Wagner, and Astrid Pundt — Institut für Materialphysik, Friedrich-Hundt-Platz 1, D-37077, Goettingen, Germany

It's easy accessibility and high chemical energy density makes hydrogen interesting as a future energy carrier. In addition hydrogen allows a CO2 free energy production by its reaction with oxygen to water. However one major drawback of hydrogen is its dangers when in contact with oxygen. At concentrations in the regime of 4% to 94% hydrogen is highly flammable and explosive, which makes it difficult to store and transport. Out of these reasons effective hydrogen sensors are needed for a large scale hydrogen energy network. In this work the up-to-date development of hydrogen sensors is presented and compared to a new type of thin film palladium sensor. We deposited thin Palladium films on Sapphire substrates. Later the film was fractured by Joule heating. This leads to a percolated surface which shows large resistivity effects when contacted with hydrogen. The Sensor shows good reversibility at slow reaction and decay times in the minute range. However the resistivity changes up to 6000% when contacted with hydrogen and the minimal detection limit lies at 10-20 mbar, values which both exceed other hydrogen sensors. Financial support by the DFG via PU131/9 and SFB602 is gratefully acknowledged.