Mishra Neeraj, Vlamidis Ylea, Martini Leonardo, Lanza Arianna, Gebeyehu Zewdu M, Jouvray Alex, La Sala Marco, Gemmi Mauro, Mišeikis Vaidotas, Perry Matthew, Teo Kenneth B K, Forti Stiven, Coletti Camilla
Center for Nanotechnology Innovation@NEST, Istituto Italiano di Tecnologia, Piazza San Silvestro, 12, 56126 Pisa, Italy.
Graphene Labs, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genova, Italy.
ACS Appl Eng Mater. 2023 Jun 1;1(7):1937-1945. doi: 10.1021/acsaenm.3c00249. eCollection 2023 Jul 28.
Copper (Cu) is the electrical conductor of choice in many categories of electrical wiring, with household and building installation being the major market of this metal. This work demonstrates the coating of Cu wires-with diameters relevant for low-voltage (LV) applications-with graphene. The chemical vapor deposition (CVD) coating process is rapid, safe, scalable, and industrially compatible. Graphene-coated Cu wires display good oxidation resistance and increased electrical conductivity (up to 1% immediately after coating and up to 3% after 24 months), allowing for wire diameter reduction and thus significant savings in wire production costs. Combined spectroscopic and diffraction analysis indicates that the conductivity increase is due to a change in Cu crystallinity induced by the coating process conditions, while electrical testing of aged wires shows that graphene plays a major role in maintaining improved electrical performances over long periods of time. Finally, graphene coating of Cu wires using an ambient-pressure roll-to-roll (R2R) CVD reactor is demonstrated. This enables the in-line production of graphene-coated metallic wires as required for industrial scale-up.
铜（Cu）是许多类电线中首选的导电材料，家庭和建筑安装是这种金属的主要市场。这项工作展示了用石墨烯对与低压（LV）应用相关直径的铜导线进行涂层处理。化学气相沉积（CVD）涂层工艺快速、安全、可扩展且与工业兼容。石墨烯涂层的铜导线显示出良好的抗氧化性和增加的电导率（涂层后立即高达1%，24个月后高达3%），这使得导线直径可以减小，从而显著节省导线生产成本。综合光谱和衍射分析表明，电导率的增加是由于涂层工艺条件引起的铜结晶度变化，而对老化导线的电气测试表明，石墨烯在长时间维持改善的电气性能方面起主要作用。最后，展示了使用常压卷对卷（R2R）CVD反应器对铜导线进行石墨烯涂层处理。这能够根据工业扩大规模的要求在线生产石墨烯涂层的金属导线。
