Stretchable, Ultrathin, Porous Metallic Films With Ultrahigh-Conductivity for Ultrabroadband Ultraviolet–Visible–Infrared-Microwave Management

Wenrui Che, Yanli Deng, Gengjiang Yao, Na Wu*, Zihan Zhu, Chuanzai Ma, Shanbo Li, Zecheng Li, Jiurong Liu*, Guorui Wang*, Zhihui Zeng*

 Advanced Functional Materials   (2026) doi: https://doi.org/10.1002/adfm.76926

ABSTRACT

   Lightweight, ultrathin, and mechanically ultraflexible electromagnetic interference (EMI) shielding materials are urgently needed for next-generation electronics. Herein, we develop a stretchable, porous thin film featuring a low-roughness copper nanolayer (CuNL) and highly fused polyurethane (PU) fiber networks via a facile, scalable combination of electrospinning, hot pressing, and electroless plating. The conformal core–shell architecture integrates a highly conductive CuNL with an elastic porous scaffold, delivering excellent conductivity (8.5 × 105 S m−1), high stretchability (tensile strain >100%), air permeability, hydrophobicity, waterproof capability, and broadband high-efficiency EMI shielding performance. At an ultralow thickness of 2.9 µm and density of 1.39 g cm−3, the film achieves an EMI shielding effectiveness (SE) of over 50 dB, a thickness-normalized SE of 17 586 dB mm−1, and a surface-specific SE of 127 500 dB cm2 g−1, outperforming existing metal-based and flexible EMI shields. Moreover, the wearable PU/CuNL film offers >90% ultraviolet–visible–infrared (UV–vis–IR) reflectance, enabling integrated UV protection, thermoregulation, and IR thermal-radiation management. This work provides a promising platform for lightweight yet ultrathin multifunctional materials that combine high-performance EMI shielding, mechanical deformability, and multispectral management for future flexible electronics and wearable devices.