Interfacial Interaction and Stress Engineering for Enhancing Electrical Conductivity of Graphene/Copper Composites

IF 9.7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Today Physics Pub Date : 2025-10-18 DOI:10.1016/j.mtphys.2025.101895

Zhihao Zheng, Wentao Yuan, Yiling Huang, Yifeng Zhao, Jiayao Chen, Xuefu Zhang, Yi Zeng, Zhiyuan Shi, Qingkai Yu, Xiaoming Xie

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引用次数: 0

Abstract

Copper with electrical conductivity (EC) exceeding 100% International Annealed Copper Standard (IACS) is in high demand for power and microelectronic applications. Graphene/copper composites have emerged as a promising solution to meet this demand. However, the mechanism underlying the EC enhancement remains a subject of debate, which poses a challenge to their scalable production. In this study, we fabricated graphene/copper composite through plasma-enhanced chemical vapor deposition (PECVD) and demonstrated the enhanced EC up to 109.4% IACS by controlling the interfacial interaction between graphene and copper. Electron backscatter diffraction (EBSD) reveals directional residual stresses in the copper substrate, while high-resolution transmission electron microscopy (HRTEM) and geometric phase analysis (GPA) resolve a near-surface lattice-distortion layer beneath a few layers continuous graphene. By tuning hydrogenation defects through RF power, we modulate interfacial adhesion, the induced stress state, and the EC enhancement. The results establish interfacial-stress engineering as a practical route to copper conductors surpassing 100% IACS.

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增强石墨烯/铜复合材料导电性的界面相互作用和应力工程

电导率（EC）超过100%国际退火铜标准（IACS）的铜在电力和微电子应用中有很高的需求。石墨烯/铜复合材料已成为满足这一需求的有希望的解决方案。然而，EC增强的机制仍然是一个争论的主题，这对其可扩展的生产提出了挑战。在本研究中，我们通过等离子体增强化学气相沉积（PECVD）制备了石墨烯/铜复合材料，并通过控制石墨烯与铜之间的界面相互作用，证明了石墨烯/铜复合材料的EC增强达到109.4%的IACS。电子背散射衍射（EBSD）揭示了铜衬底中的定向残余应力，而高分辨率透射电子显微镜（HRTEM）和几何相分析（GPA）揭示了几层连续石墨烯下的近表面晶格畸变层。通过射频功率调节氢化缺陷，可以调节界面粘附、诱导应力状态和EC增强。结果表明，界面应力工程是实现铜导体超过100% IACS的可行途径。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Today Physics Materials Science-General Materials Science

CiteScore

14.00

自引率

7.80%

发文量

284

审稿时长

15 days

期刊介绍： Materials Today Physics is a multi-disciplinary journal focused on the physics of materials, encompassing both the physical properties and materials synthesis. Operating at the interface of physics and materials science, this journal covers one of the largest and most dynamic fields within physical science. The forefront research in materials physics is driving advancements in new materials, uncovering new physics, and fostering novel applications at an unprecedented pace.