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    Breaking News

    Fraunhofer FEP Examines Deposition of Thin Insulating Layers for Sensors in Hydrogen Technology

    Goal is to increase the reliability and durability of pressure sensors for hydrogen technology.

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    09.19.18
    Scientists at the Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP have investigated new approaches for depositing low-defect insulating layers, part of the joint project NaFuSS (German Federal Ministry of Education and Research/BMBF promotional reference number 13N13171). The aim is to increase the reliability and durability of pressure sensors for hydrogen technology, an area that is becoming increasingly important.
     
    The new approaches and results of the study will be presented at both the 16th International Conference on Plasma Surface Engineering PSE in Garmisch-Partenkirchen, Germany, Sept. 17-21, 2018 and at electronica 2018 in Munich, Germany, Nov. 13-16, 2018.
     
    Due to an increasing change in thinking favoring environmentally friendlier behavior in everyday life, more people are buying electric cars or using car-sharing services. Those also are increasingly committed to fleets of electric cars. But electric cars still have a major shortcoming. Due to their long charging times, they are not a viable alternative yet for drivers who use their vehicles frequently, for people needing a lot of flexibility such as on-call services, for local public transport, and trucks. However, these cases can be handled another way. Hydrogen-powered vehicles require less than five minutes to refuel and are therefore a real alternative to the predominant propulsion systems.
     
    Yet, there are still hurdles here. Hydrogen in combination with oxygen is extremely flammable and thus rapidly poses a danger. Its storage in hydrogen tanks is at pressures of over 700 bar in some cases. Extremely sensitive and accurate sensors are therefore required for precision monitoring. Hydrogen is extremely volatile due to its atomic structure. It even diffuses through steel. As a result, its storage and transfer require components with high corrosion resistance, temperature stability, high dielectric strength, protection from explosion and a good proton barrier.
     
    In order to be able to implement reliable sensors for hydrogen technology, scientists at the Fraunhofer FEP have now developed a technique using reactive magnetron sputtering for deposition of low-defect insulating layers characterized by minimal proton diffusion and excellent dielectric strength. The technique is based on nanofunctional materials.
     
    It is now possible to deposit a system of insulating layers onto rough steel surfaces that has a dielectric strength of more than 2000 V and resistivity of more than 1x1015 Ωcm, meeting the requirements for explosion prevention in hydrogen technology. At the same time, a very effective proton barrier has been demonstrated that exceeds even layers of gold used previously.
     
    “The insulating layer produced in this way with these properties is unique. A comparable layer has not yet been economically realized in practice. Thanks to the new process, it is now possible to coat sensors at a deposition rate of approximately 2 nm/s and manufacture them on an industrial scale,” said project manager Jan Hildisch.
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