Ultrasensitive, Stretchable, and Fast-Response Temperature Sensors Based on Hydrogel Films for Wearable Applications,ACS Applied Materials & Interfaces

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Ultrasensitive, Stretchable, and Fast-Response Temperature Sensors Based on Hydrogel Films for Wearable Applications
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-04-28 , DOI: 10.1021/acsami.1c05291
Zixuan Wu ₁ , Haojun Ding ₁ , Kai Tao ₂ , Yaoming Wei ₁ , Xuchun Gui ₁ , Wenxiong Shi ₃ , Xi Xie ₁ , Jin Wu ₁

Affiliation

Conductive hydrogels can be used in wearable electronics integrated with skin, but the bulk structure of existing hydrogel-based temperature sensors limits the wearing comfort, response/recovery speeds, and sensitivity. Here, stretchable and transparent temperature sensors based on a novel thin-film sandwich structure (TFSS) are designed, which display unprecedented thermal sensitivity (24.54%/°C), fast response time (0.19 s) and recovery time (0.08 s), a broad detection range (from −28 to 95.3 °C), high resolution (0.8 °C), and high stability. The thin hydrogel layer (12.15 μm) is encapsulated by two thin elastomer layers, which prevent the water evaporation and enhance the heat transfer, leading to the boosted stability and accelerated response/recovery speeds. The nondrying and antifreezing capabilities are further promoted by the hydratable lithium bromide (LiBr) incorporated in the hydrogel, enabling it to avoid dehydration in an extremely arid environment and freeze below subzero temperatures (freezing point below −120 °C). A comparative study reveals that the thermal sensitivity displayed by the TFSS sensor in capacitance mode is several times higher than that in conventional conductance/resistance mode above room temperature. Importantly, a new mechanism based on a horizontal plate capacitance model is proposed to understand the high sensitivity by considering the permittivity and geometry variations of TFSS. The thin TFSS, stretchability and transparency enable the sensor to be conformally and comfortably attached to human skin for real-time and reliable monitoring of various human motions, physical states, skin temperature, etc., without affecting the appearance.

中文翻译：

用于可穿戴应用的基于水凝胶薄膜的超灵敏、可拉伸和快速响应温度传感器

导电水凝胶可用于与皮肤集成的可穿戴电子产品，但现有基于水凝胶的温度传感器的整体结构限制了佩戴舒适度、响应/恢复速度和灵敏度。在这里，设计了基于新型薄膜夹层结构 (TFSS) 的可拉伸透明温度传感器，具有前所未有的热灵敏度 (24.54%/°C)、快速响应时间 (0.19 s) 和恢复时间 (0.08 s)，检测范围广（-28 至 95.3 °C）、高分辨率 (0.8 °C) 和高稳定性。薄水凝胶层 (12.15 μm) 被两个薄弹性体层包裹，可防止水蒸发并增强传热，从而提高稳定性和加快响应/恢复速度。水凝胶中掺入的可水合溴化锂 (LiBr) 进一步提高了不干燥和防冻能力，使其能够避免在极其干旱的环境中脱水并在零下温度（冰点低于 -120°C）下冻结。比较研究表明，TFSS 传感器在电容模式下显示的热灵敏度比在室温以上的传统电导/电阻模式下高出数倍。重要的是，提出了一种基于水平板电容模型的新机制，通过考虑 TFSS 的介电常数和几何变化来理解高灵敏度。薄的 TFSS、可拉伸性和透明度使传感器能够共形且舒适地附着在人体皮肤上，以实时可靠地监测各种人体运动，

更新日期：2021-05-12

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