γ-ray irradiation effect on the electrical transport properties of Cu films

Zhaoguo Li, Dawei Yan, Zhiqiang Zhan, Jiangshan Luo, Zhiqing Wu, Fan Lei, Yudan He, Lei Jin, Bo Yang () and Qiubo Fu ()
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Zhaoguo Li: Research Center of Laser Fusion, China Academy of Engineering Physics
Dawei Yan: Research Center of Laser Fusion, China Academy of Engineering Physics
Zhiqiang Zhan: Research Center of Laser Fusion, China Academy of Engineering Physics
Jiangshan Luo: Research Center of Laser Fusion, China Academy of Engineering Physics
Zhiqing Wu: Research Center of Laser Fusion, China Academy of Engineering Physics
Fan Lei: Institute of Chemical Materials, China Academy of Engineering Physics
Yudan He: Research Center of Laser Fusion, China Academy of Engineering Physics
Lei Jin: Research Center of Laser Fusion, China Academy of Engineering Physics
Bo Yang: Research Center of Laser Fusion, China Academy of Engineering Physics
Qiubo Fu: Institute of Chemical Materials, China Academy of Engineering Physics

The European Physical Journal B: Condensed Matter and Complex Systems, 2025, vol. 98, issue 7, 1-8

Abstract: Abstract We reported the electrical transport properties of Cu films under γ-ray irradiation. The temperature dependence of resistance curves coincides with each other before and after irradiation when the irradiation dose is $$\lesssim 3.6\times {10}^{6} \text{rad}(\text{Si})$$ ≲ 3.6 × 10 6 rad ( Si ) . The resistance of the irradiated Cu film is greater than that of the non-irradiated film across the whole temperature range when the irradiation dose is $$\gtrsim 3.6\times {10}^{7} \text{rad}(\text{Si})$$ ≳ 3.6 × 10 7 rad ( Si ) . This phenomenon is caused by the enhanced surface oxidation effect induced by γ-ray irradiation, and this mechanism has been confirmed by chemical composition analysis. Furthermore, the electrical transport properties of Cu films with and without polyimide coverage were measured during γ-ray irradiation. The experimental results showed that the bare Cu film undergoes surface oxidation, while the Cu film covered by polyimide does not. These results further validate the γ-irradiation enhanced oxidation mechanism in Cu films. Graphical abstract The resistance of the irradiated Cu film greater than that of the non-irradiated film was observed in the whole temperature range when irradiation dose is larger than a critical dose. The physical mechanism of above phenomenon is ascribed to the enhanced surface oxidation effect induced by γ-ray irradiation. The electrical transport properties of Cu films with and without polyimide coverage were also measured during γ-ray irradiation. The experimental results showed that the bare Cu film undergoes surface oxidation, while the Cu film covered by polyimide does not. These results further validate the γ-irradiation enhanced oxidation mechanism in Cu films.

Date: 2025
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DOI: 10.1140/epjb/s10051-025-00966-7

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