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Article

Chromatic Change in Copper Oxide Layers Irradiated with Low Energy Ions

1
Faculty of Materials Science and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo, Kyoto 606-8585, Japan
2
Research Institute of Nanodevice and Bio Systems, Hiroshima University, Kagamiyama 1-4-1, Higashi-Hiroshima, Hiroshima 739-8527, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Akihiro Iwase
Quantum Beam Sci. 2021, 5(1), 7; https://doi.org/10.3390/qubs5010007
Received: 2 February 2021 / Revised: 2 March 2021 / Accepted: 9 March 2021 / Published: 10 March 2021
The color of a thin copper oxide layer formed on a copper plate was transformed from reddish-brown into dark blue-purple by irradiation with 5 keV Ar+ ions to a fluence as low as 1 × 1015 Ar+ cm−2. In the unirradiated copper oxide layer, the copper valence state of Cu2+ and Cu+ and/or Cu0 was included as indicated by the presence of a shake-up satellite line in a photoemission spectrum. While for the irradiated one, the satellite line decreased in intensity, indicating that irradiation resulted in the reduction from Cu2+ to Cu+ and/or Cu0. Furthermore, nuclear reaction analysis using a 16O(d, p)17O reaction with 0.85 MeV deuterons revealed a significant loss of oxygen (5 × 1015 O atoms cm−2) in the irradiated layer. Thus, the chromatic change observed in the present work originated in the irradiation-induced reduction of a copper oxide. View Full-Text
Keywords: ion beam; copper oxide; chromatic change; photoemission spectrum; beam viewer ion beam; copper oxide; chromatic change; photoemission spectrum; beam viewer
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MDPI and ACS Style

Kobayashi, T.; Nishiyama, F.; Takahiro, K. Chromatic Change in Copper Oxide Layers Irradiated with Low Energy Ions. Quantum Beam Sci. 2021, 5, 7. https://doi.org/10.3390/qubs5010007

AMA Style

Kobayashi T, Nishiyama F, Takahiro K. Chromatic Change in Copper Oxide Layers Irradiated with Low Energy Ions. Quantum Beam Science. 2021; 5(1):7. https://doi.org/10.3390/qubs5010007

Chicago/Turabian Style

Kobayashi, Takuya, Fumitaka Nishiyama, and Katsumi Takahiro. 2021. "Chromatic Change in Copper Oxide Layers Irradiated with Low Energy Ions" Quantum Beam Science 5, no. 1: 7. https://doi.org/10.3390/qubs5010007

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