Depending on the production process,copper(Cu)foils can be classified into two types,i.e.,rolled copper(r-Cu)foils and electrolytic copper(e-Cu)foils.Owing to their high electrical conductivity and ductility at low co...Depending on the production process,copper(Cu)foils can be classified into two types,i.e.,rolled copper(r-Cu)foils and electrolytic copper(e-Cu)foils.Owing to their high electrical conductivity and ductility at low cost,e-Cu foils are employed extensively in modern industries and account for more than 98%of the Cu foil market share.However,industrial e-Cu foils have never been single-crystallized due to their high density of grain boundaries,various grain orientations and vast impurities originating from the electrochemical deposition process.Here,we report a methodology of transforming industrial e-Cu foils into single crystals by facet copy from a single-crystal template.Different facets of both low and high indices are successfully produced,and the thickness of the single crystal can reach 500μm.Crystallographic characterizations directly recognized the single-crystal copy process,confirming the complete assimilation impact from the template.The obtained single-crystal e-Cu foils exhibit remarkably improved ductility(elongation-to-fracture of 105%vs.25%),fatigue performance(the average numbers of cycles to failure of 1600 vs.200)and electrical property(electrical conductivity of 102.6%of the international annealed copper standard(IACS)vs.98.5%)than original ones.This work opens up a new avenue for the preparation of single-crystal e-Cu foils and may expand their applications in high-speed,flexible,and wearable devices.展开更多
We report an efficient and economical way for mass production of large-scale graphene films with high quality and uniformity.By using the designed scrolled copper-graphite structure,a continuous graphene film with typ...We report an efficient and economical way for mass production of large-scale graphene films with high quality and uniformity.By using the designed scrolled copper-graphite structure,a continuous graphene film with typical area of 200×39 cm^2 could be obtained in 15 min,and the production rate of the graphene film and space utilization rate of the CVD reactor can reach 520 cm 2⋅min−1 and 0.38 cm−1⋅min−1,respectively.Our method provides a guidance for the industrial production of graphene films,and may also accelerate its large-scale applications.展开更多
The addition of graphene(Gr)as a secondphase reinforcement material is expected to enhance the mechanical properties of copper(Cu)composite materials while minimizing the loss of electrical properties.However,during t...The addition of graphene(Gr)as a secondphase reinforcement material is expected to enhance the mechanical properties of copper(Cu)composite materials while minimizing the loss of electrical properties.However,during the processing-induced deformation of Gr/Cu composites,the interfacial couplings are commonly believed to lead to the destruction of graphene.It remains uncertain whether graphene retains its integrity and exhibits excellent performance during heavy stretching.Here,by analysing the tensile deformation behaviour of the Gr/Cu composites,we develop a“strain-slip”model and confirm that graphene initially deforms(before the critical strain of 4.0%)and then slips(beyond the critical strain)relative to the Cu substrate during stretching,thereby preserving its structural integrity.We further fabricate conductive wires using Gr/Cu composites,which exhibit a 12.9% increase in tensile strength compared to pure Cu wires,with electrical conductivity reaching 102.2% International Annealed Copper Standard(IACS)in the annealed state.This study validates the reliability of graphene as a robust second-phase reinforcement material and provides support for the advanced deformation-sensitive applications of Gr/Cu composites.展开更多
基金financially supported by Guangdong Major Project of Basic and Applied Basic Research(No.2021B0301030002)the National Natural Science Foundation of China(No.52025023)the Key R&D Program of Guangdong Province(No.2020B010189001).
文摘Depending on the production process,copper(Cu)foils can be classified into two types,i.e.,rolled copper(r-Cu)foils and electrolytic copper(e-Cu)foils.Owing to their high electrical conductivity and ductility at low cost,e-Cu foils are employed extensively in modern industries and account for more than 98%of the Cu foil market share.However,industrial e-Cu foils have never been single-crystallized due to their high density of grain boundaries,various grain orientations and vast impurities originating from the electrochemical deposition process.Here,we report a methodology of transforming industrial e-Cu foils into single crystals by facet copy from a single-crystal template.Different facets of both low and high indices are successfully produced,and the thickness of the single crystal can reach 500μm.Crystallographic characterizations directly recognized the single-crystal copy process,confirming the complete assimilation impact from the template.The obtained single-crystal e-Cu foils exhibit remarkably improved ductility(elongation-to-fracture of 105%vs.25%),fatigue performance(the average numbers of cycles to failure of 1600 vs.200)and electrical property(electrical conductivity of 102.6%of the international annealed copper standard(IACS)vs.98.5%)than original ones.This work opens up a new avenue for the preparation of single-crystal e-Cu foils and may expand their applications in high-speed,flexible,and wearable devices.
基金Supported by the Beijing Natural Science Foundation(Grant No.JQ19004)the Key R&D Program of Guangdong Province(Grant Nos.2019B010931001,2020B010189001,2018B010109009 and 2018B030327001)+9 种基金Bureau of Industry and Information Technology of Shenzhen(Graphene platform 201901161512)the National Natural Science Foundation of China(Grant Nos.51991340,51991342 and 51522201)the National Key R&D Program of China(Grant Nos.2016YFA0300903 and 2016YFA0300804)the Beijing Excellent Talents Training Support(Grant No.2017000026833ZK11)the Beijing Municipal Science&Technology Commission(Grant No.Z191100007219005)the Beijing Graphene Innovation Program(Z181100004818003)the Guangdong Innovative and Entrepreneurial Research Team Program(Grant No.2016ZT06D348)the Science,Technology and Innovation Commission of Shenzhen Municipality(Grant No.KYTDPT20181011104202253)the National Postdoctoral Program for Innovative Talents(Grant No.BX20190016)China Postdoctoral Science Foundation(Grant Nos.2019M660280 and 2019M660281).
文摘We report an efficient and economical way for mass production of large-scale graphene films with high quality and uniformity.By using the designed scrolled copper-graphite structure,a continuous graphene film with typical area of 200×39 cm^2 could be obtained in 15 min,and the production rate of the graphene film and space utilization rate of the CVD reactor can reach 520 cm 2⋅min−1 and 0.38 cm−1⋅min−1,respectively.Our method provides a guidance for the industrial production of graphene films,and may also accelerate its large-scale applications.
基金granted by Guangdong Major Project of Basic and Applied Basic Research(No.2021B0301030002)the National Natural Science Foundation of China(Nos.52172035,52025023,52021006,T2188101,52402043,and U24A20285)+1 种基金China Postdoctoral Science Foundation(No.2023M730103)the National Key R&D Program of China(No.2021YFA1400502).
文摘The addition of graphene(Gr)as a secondphase reinforcement material is expected to enhance the mechanical properties of copper(Cu)composite materials while minimizing the loss of electrical properties.However,during the processing-induced deformation of Gr/Cu composites,the interfacial couplings are commonly believed to lead to the destruction of graphene.It remains uncertain whether graphene retains its integrity and exhibits excellent performance during heavy stretching.Here,by analysing the tensile deformation behaviour of the Gr/Cu composites,we develop a“strain-slip”model and confirm that graphene initially deforms(before the critical strain of 4.0%)and then slips(beyond the critical strain)relative to the Cu substrate during stretching,thereby preserving its structural integrity.We further fabricate conductive wires using Gr/Cu composites,which exhibit a 12.9% increase in tensile strength compared to pure Cu wires,with electrical conductivity reaching 102.2% International Annealed Copper Standard(IACS)in the annealed state.This study validates the reliability of graphene as a robust second-phase reinforcement material and provides support for the advanced deformation-sensitive applications of Gr/Cu composites.
基金supported by the Key R&D Program of Guangdong Province(2020B010189001 and 2019B010931001)the National Natural Science Foundation of China(52025023,92163206,51991342,52021006,52172035,and 52202161)+4 种基金the Strategic Priority Research Program of Chinese Academy of Sciences(XDB33000000)the National Key R&D Program of China(2021YFA1400502,2021YFB3200303,and 2021YFA1400201)Guangdong Major Project of Basic and Applied Basic Research(2021B0301030002)the Fundamental Research Funds for the Central Universities(06500235)support from the National Program for Support of Top-notch Young Professionals。
