目前，用于光电器件和智能窗的可见光透明导电材料已经取得了快速发展。然而，在红外波段，由于透光率和导电性之间的相互制约，可见-红外宽波段透明导电材料的发展受到了限制。
近日，中国科学院苏州纳米技术与纳米仿生研究所苏文明研究员、陈小连博士和吉林大学徐速教授等人在Science China Materials发表研究论文，提出了一种无损伤的间接转移技术，将剥离后的独立铜网栅通过聚合物键合技术转移至可见-红外光谱衬底表面，成功制备出高性能的可见-红外透明铜网栅导电材料。
本文要点
1) 该铜网栅导电材料在550 nm时透光率可达81%，在10 μm时透光率为65%，有效解决了可见-红外波段中高透光率与高导电性难以兼得的难题。此外，所开发的键合策略赋予该材料优异的附着力和环境可靠性。2) 凭借其出色的性能，铜网栅透明导电材料被应用于透明电加热和电磁屏蔽领域，并表现出优异的效果。在8.2和12.4 GHz频段下，其屏蔽效能分别达到44.7和36.6 dB，是目前报道的可见-红外透明屏蔽材料中性能最佳的材料。这使其在夜视仪光电探测光学窗口的除霜除雾和电磁屏蔽应用中展现出广阔的应用前景。Figure 1. The vis-IR Cu mesh TC based on metal-mesh: (a) the detailed fabrication diagram; (b) the Cu mesh TC on a sapphire substrate; (c) SEM image of the peeled Cu mesh from grooves on the polymer film; (d) SEM image of Cu mesh TC on quartz; (e) cross-sectional image of the Cu mesh.Figure 2. The optical properties of Cu mesh TCs with different metal filling ratios on different substrates (the metal linewidth is ~2.3 μm and thickness is ~6.4 μm): (a) Cu mesh on quartz substrate between 300–2600 nm; (b) different mesh linewidth on quartz substrate in the wavelength band of 300–2600 nm; (c) Cu mesh on sapphire substrate between 300 nm–6 μm; (d) Cu mesh on ZnS substrate between 300 nm–12.5 μm (the optical and infrared pictures in the inset).Figure 3. Electromagnetic shielding performance of Cu mesh conductors: (a) Cu mesh samples with different metal filling ratios between 8.2–12.4 GHz; (b) SER, SEA, and SET of the conductor at X band with different metal filling ratios; (c) Cu mesh samples with metal thicknesses of 4, 6, and 8 μm between 8.2–12.4 GHz; (d–f) SE performance under high temperature (85°C) and high humidity (85%), high temperature (150°C), and low temperature (−20°C), respectively.Figure 4. The optical observation box with the transparent electromagnetic shielding optical window based on ZnS substrate: (a) Schematic diagram; (b) fabricated optical observation box with Cu mesh electromagnetic shielding window; (c) heating strip; (d) heating apparatus in the box; (e) infrared image of the heating strip through the transparent electromagnetic shielding window; (f) signal strength of the smartphone before and (g) after placing it in the box.Tengfei Li, Xiaolian Chen, Zhaohua Xu, Shuhong Nie, Wenya Xu, Wei Yuan, Su Xu, Shuo Zhang, Fangfang Pei, Wenming Su, Zheng Cui. High-performance visible-infrared broadband transparent copper mesh conductor and applications for electromagnetic shielding and heating. Sci. China Mater. (2024).https://doi.org/10.1007/s40843-024-3186-7
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