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Hydrogen Removal from Hydrogenated Diamond-Like Carbon Films by Exposure to Photon and Energetic Atomic Oxygen Beams

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Protection of Materials and Structures From the Space Environment

Abstract

Stability of hydrogen in diamond-like carbon (DLC) film under simulated space environment, i.e., hyperthermal atomic oxygen, vacuum ultraviolet (VUV) and soft X-ray exposures has been studied. Hydrogen in DLC was released by exposure to low-energy atomic oxygen beam, whereas the gasification reaction of carbon atom needed collision energy above 3 eV. The desorption process in the deep region required a higher collision energy. The density of hydrogen decreased 11% by atomic oxygen exposure, and was independent of the collision energy. Photon exposure also releases hydrogen from DLC. High-energy photons in soft x-ray promote the hydrogen desorption even from deeper region with high efficiency. It was considered that soft x-ray could release bonded hydrogen which is not released by VUV or atomic oxygen exposures.

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Acknowledgments

The authors would like to thank T. Kinoshita of Kobe University for his help with the experiment. This work is partly supported by New Energy and Industrial Technology Development Organization (NEDO) under the “Advanced Fundamental Research Project on Hydrogen Storage Materials”.

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Correspondence to Masahito Tagawa .

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Yokota, K. et al. (2013). Hydrogen Removal from Hydrogenated Diamond-Like Carbon Films by Exposure to Photon and Energetic Atomic Oxygen Beams. In: Kleiman, J., Tagawa, M., Kimoto, Y. (eds) Protection of Materials and Structures From the Space Environment. Astrophysics and Space Science Proceedings, vol 32. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-30229-9_49

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  • DOI: https://doi.org/10.1007/978-3-642-30229-9_49

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-30228-2

  • Online ISBN: 978-3-642-30229-9

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