Chromatic Change in Copper Oxide Layers Irradiated with Low Energy Ions

Kobayashi, Takuya; Nishiyama, Fumitaka; Takahiro, Katsumi

doi:10.3390/qubs5010007

Open AccessArticle

Chromatic Change in Copper Oxide Layers Irradiated with Low Energy Ions

by

Takuya Kobayashi

¹,

Fumitaka Nishiyama

² and

Katsumi Takahiro

^1,*

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.

Quantum Beam Sci. 2021, 5(1), 7; https://doi.org/10.3390/qubs5010007

Submission received: 2 February 2021 / Revised: 2 March 2021 / Accepted: 9 March 2021 / Published: 10 March 2021

(This article belongs to the Special Issue The Modifications of Metallic and Inorganic Materials by Using Energetic Ion/Electron Beams)

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Abstract

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.

Keywords: 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

APA Style

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

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Chromatic Change in Copper Oxide Layers Irradiated with Low Energy Ions

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