Bilayer graphene-covered Cu flexible electrode with excellent mechanical reliability and electrical performance
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Bilayer graphene-covered Cu flexible electrode with excellentmechanicalreliabilityandelectricalperformance Yu-Jia Yang1, Bin Zhang1,a)
, Hong-Yuan Wan2, Kun Liu3, Guang-Ping Zhang4
1
Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, People’s Republic of China 2 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, People’s Republic of China 3 School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, People’s Republic of China 4 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China a) Address all correspondence to this author. e-mail: [email protected] Received: 2 August 2019; accepted: 3 September 2019
Flexible electrode is an indispensable component of emerging portable, flexible, and wearable electronic devices. Although various flexible electrodes with different dimensions and functions have been explored, developing a new electrode material with excellent mechanical reliability and superior electrical performance remains a challenge. Here, a graphene-covered Cu composite electrode film with a total thickness of ∼100 nm is successfully fabricated onto a flexible polyimide substrate by means of a series of assembly methods including physical vapor deposition, chemical vapor deposition, and transfer technique. The composite electrode film on the flexible substrate exhibits evidently enhanced tensile strength, monotonic bending, and repeatedly bending fatigue reliability as well as electrical performance compared with that of the bared Cu film electrode. Such excellent mechanical performances are attributed to the role of the graphene coating in suppressing fatigue damage formation and preventing crack advance. It is expected that the chemical vapordeposited graphene-covered Cu composite electrode would extend the potential ultrathin metal film electrode as the innovative electrode material for the next-generation flexible electronic devices.
Introduction Flexible electrode is an essential component of various recently emerging portable, flexible, and wearable electronic devices such as flexible energy storage devices, flexible displays, wearable sensor system, and implantable medical devices [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]. In many cases, the major limitation for the development flexible electrode materials with superior performance is their long-term service reliability since the flexible devices are inevitably subjected to cyclic stretching, repeatedly bending, or even twisting in their daily use. One effective solution is to utilize robust materials for optimizing their performance and long-term service reliability [12]. Recently, carbon nanotubes (CNT) [13,
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