Purification of copper foils driven by single crystallization

寇金宗 ¹赵孟泽 ²李兴光 ²何梦林 ³杨方友 ³刘科海 ³成庆秋 ⁴任云龙 ⁴刘灿 ⁵付莹 ³吴慕鸿 ⁶刘开辉 ⁷王恩哥⁸

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作者信息

1. Songshan Lake Materials Laboratory,Dongguan 523808,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,School of Physics,South China Normal University,Guangzhou 510006,China;Guangdong-Hong Kong Joint Laboratory of Quantum Matter,Frontier Research Institute for Physics,South China Normal University,Guangzhou 510006,China
2. State Key Laboratory for Mesoscopic Physics,Frontiers Science Center for Nano-optoelectronics,School of Physics,Peking University,Beijing 100871,China
3. Songshan Lake Materials Laboratory,Dongguan 523808,China
4. Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials,School of Physics,South China Normal University,Guangzhou 510006,China;Guangdong-Hong Kong Joint Laboratory of Quantum Matter,Frontier Research Institute for Physics,South China Normal University,Guangzhou 510006,China
5. Key Laboratory of Quantum State Construction and Manipulation(Ministry of Education),Department of Physics,Renmin University of China,Beijing 100872,China
6. Songshan Lake Materials Laboratory,Dongguan 523808,China;International Center for Quantum Materials,Collaborative Innovation Center of Quantum Matter,Peking University,Beijing 100871,China
7. Songshan Lake Materials Laboratory,Dongguan 523808,China;State Key Laboratory for Mesoscopic Physics,Frontiers Science Center for Nano-optoelectronics,School of Physics,Peking University,Beijing 100871,China;International Center for Quantum Materials,Collaborative Innovation Center of Quantum Matter,Peking University,Beijing 100871,China
8. Songshan Lake Materials Laboratory,Dongguan 523808,China;International Center for Quantum Materials,Collaborative Innovation Center of Quantum Matter,Peking University,Beijing 100871,China;School of Physics,Liaoning University,Shenyang 110036,China
折叠

Abstract

High-purity copper(Cu)with excellent thermal and electrical conductivity,is crucial in modern technological appli-cations,including heat exchangers,integrated circuits,and superconducting magnets.The current purification process is mainly based on the zone/electrolytic refining or anion exchange,however,which excessively relies on specific integrated equipment with ultra-high vacuum or chemical solution environment,and is also bothered by external contaminants and energy consumption.Here we report a simple approach to purify the Cu foils from 99.9％(3N)to 99.99％(4N)by a temperature-gradient thermal annealing technique,accompanied by the kinetic evolution of single crystallization of Cu.The success of purification mainly relies on(i)the segregation of elements with low effective distribution coefficient driven by grain-boundary movements and(ii)the high-temperature evaporation of elements with high saturated vapor pressure.The purified Cu foils display higher flexibility(elongation of 70％)and electrical conductivity(104％IACS)than that of the original commercial rolled Cu foils(elongation of 10％,electrical conductivity of～100％IACS).Our results provide an effective strategy to optimize the as-produced metal medium,and therefore will facilitate the potential applications of Cu foils in precision electronic products and high-frequency printed circuit boards.

Key words

purification/copper foil/thermal annealing technique/single crystallization

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基金项目

Basic and Applied Basic Research Foundation of Guangdong Province,China(2019A1515110302)

Basic and Applied Basic Research Foundation of Guangdong Province,China(2022A1515140003)

Key Research and Development Program of Guangdong Province,China(2020B010189001)

Key Research and Development Program of Guangdong Province,China(2021B0301030002)

Key Research and Development Program of Guangdong Province,China(2019B010931001)

Key Research and Development Program of Guangdong Province,China(2018B030327001)

National Natural Science Foundation of China(52172035)

National Natural Science Foundation of China(52025023)

National Natural Science Foundation of China(52322205)

National Natural Science Foundation of China(51991342)

National Natural Science Foundation of China(52021006)

National Natural Science Foundation of China(51991344)

National Natural Science Foundation of China(52100115)

National Natural Science Foundation of China(11888101)

National Natural Science Foundation of China(92163206)

National Natural Science Foundation of China(12104018)

National Natural Science Foundation of China(12274456)

National Key Research and Development Program of China(2021YFB3200303)

National Key Research and Development Program of China(2022YFA1405600)

National Key Research and Development Program of China(2018YFA0703700)

National Key Research and Development Program of China(2021YFA1400201)

National Key Research and Development Program of China(2021YFA1400502)

Strategic Priority Research Program of the Chinese Academy of Sciences(XDB33000000)

Pearl River Talent Recruitment Program of Guangdong Province,China(2019ZT08C321)

China Postdoctoral Science Foundation(2020T130022)

China Postdoctoral Science Foundation(2020M680178)

Science and Technology Plan Project of Liaoning Province,China(2021JH2/10100012)

出版年

2024

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

参考文献量47

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