In the present work, a stretchable transparent heater (STH) is developed consisting of a free-standing serpentine copper (Cu) mesh attached to a semipermeable polyurethane (PU) film. The as-prepared Cu mesh STH is of extremely low sheet resistance of 0.15 Ω sq⁻¹ at an optical transmittance of 82.5%. The electrothermal and mechanical properties of the fabricated STHs are systematically studied by both experimental measurements and theoretical simulations. The Cu mesh STH proves to be highly effective. For a size of 1 cm × 2 cm skin patch, it can generate temperature up to 120 °C in less than 30 s at only 0.7 V supplied voltage. The average temperature drop of the Cu mesh STH is only about 10% under 50% strain at a constant voltage. In addition to the efficient heating, the Cu mesh STH demonstrates high stability during long-term repetitive heating and cooling cycles. Moreover, the STH is air permeable and highly conformable to skin. Its high transparency allows constant monitoring of skin condition during a healing process. As a proof-of-concept, a skin patch consisted of the Cu mesh STH is successfully applied to cure the epidermal tumor of lab mice, demonstrating its great potential for skin-patched thermotherapy.

中文翻译：

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基于高导电可拉伸铜网加热器的透明热疗皮肤贴片

在目前的工作中，开发了一种可拉伸的透明加热器 (STH)，它由连接到半透聚氨酯 (PU) 薄膜的独立蛇形铜 (Cu) 网组成。所制备的铜网 STH 具有 0.15 Ω sq ^{-1 的}极低薄层电阻光透射率为 82.5%。通过实验测量和理论模拟系统地研究了制造的 STH 的电热和机械性能。事实证明，铜网 STH 非常有效。对于 1 cm × 2 cm 大小的皮肤贴片，它可以在不到 30 秒的时间内在仅 0.7 V 的供电电压下产生高达 120 °C 的温度。在恒定电压下，在 50% 应变下，Cu 网 STH 的平均温降仅为 10% 左右。除了有效加热外，Cu 网状 STH 在长期重复加热和冷却循环中表现出高稳定性。此外，STH 具有透气性，并且与皮肤高度贴合。它的高透明度允许在愈合过程中持续监测皮肤状况。作为概念验证，