Stretchable Antimicrobial Nanomesh Antenna for Robust Epidermal Millimeter‐Wave Wireless Communications

ABSTRACT Stretchable millimeter‐wave (mmWave) electronics are essential for next‐generation wearable wireless systems. However, intrinsically stretchable mmWave devices remain challenging because it is difficult to fabricate metallic structures that simultaneously combine high conductivity, mechanical stretchability, high‐resolution patterning, and skin biocompatibility for epidermal wireless operation. To bridge this gap, we report a mmWave nanomesh with low sheet resistance of 0.24 Ω/sq and µm‐level patterning precision, and broad‐spectrum antibacterial activity for hygienic epidermal deployment. The proposed nanomesh is compatible with the fabrication of mmWave antennas operating above 20 GHz and supports efficient mmWave radiation. Meanwhile, the nanomesh exhibits mechanical robustness and electrical stability even after 1000 cycles of mechanical deformations. On this basis, we realized a stretchable dual‐unit nanomesh antenna array with a high realized gain of 6.8 dBi at 24 GHz, and demonstrated the first robust mmWave wireless data transmission based on nanomesh electronics. Beyond electromagnetic performance, the nanomesh antenna exhibits long‐lasting and broad‐spectrum antibacterial effects, ensuring hygiene and safety by avoiding epidermal bacterial accumulation. Combining high electromagnetic performance, mechanical‐electrical stability, and antimicrobial ability, the proposed nanomaterial and mmWave device provide a practical strategy for wearable mmWave wireless electronics.