College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou 311121, Zhejiang, People's Republic of China.
ACS Appl Mater Interfaces. 2023 May 24;15(20):24923-24932. doi: 10.1021/acsami.3c03829. Epub 2023 May 9.
Inspired by the interlocked biological geometry of human skin, herein, we design a flexible and transparent sensor with interlocked square column arrays with composites of Ag nanoparticles (AgNPs), citric acid (CA), and poly(vinyl alcohol) (PVA), which exhibit multisensory capabilities for pressure, temperature, and humidity. As a flexible pressure sensor, the interlocked AgNPs/CA/PVA sensor possesses a high sensitivity (-1.82 kPa), low detection limit (10 Pa), fast response (75 ms), and outstanding stability due to the high sensitivity of the contact resistance of the interlocked square column arrays to pressure. Because of the rigid dependence of the resistance of the AgNPs/CA/PVA composite on temperature, the interlocked AgNPs/CA/PVA sensor can also act as a temperature sensor, which exhibits high resolution (0.1 °C) and reliability in detecting ambient temperature. In addition, it is found that the amount of water molecules adsorbed by PVA and CA changes with the ambient humidity. Therefore, the interlocked AgNPs/CA/PVA sensor is also able to detect humidity in real time. This work proposes a simple but useful route to fabricate a flexible and transparent electrical skin sensor, which has great potential in the perception of pressure, temperature, and humidity.
受人体皮肤互锁生物几何结构的启发，本文设计了一种具有互锁方柱状阵列的柔性透明传感器，该传感器由 Ag 纳米粒子 (AgNPs)、柠檬酸 (CA) 和聚乙烯醇 (PVA) 的复合材料组成，具有压力、温度和湿度的多感觉能力。作为一种柔性压力传感器，互锁 AgNPs/CA/PVA 传感器具有高灵敏度（-1.82 kPa）、低检测限（10 Pa）、快速响应（75 ms）和出色的稳定性，这是由于互锁方柱状阵列的接触电阻对压力的高灵敏度。由于 AgNPs/CA/PVA 复合材料的电阻对温度有刚性依赖，互锁 AgNPs/CA/PVA 传感器也可以作为温度传感器，在检测环境温度时具有高分辨率（0.1 °C）和可靠性。此外，还发现 PVA 和 CA 吸附的水分子数量随环境湿度而变化。因此，互锁 AgNPs/CA/PVA 传感器也能够实时检测湿度。这项工作提出了一种简单但有用的方法来制造一种柔性透明的电气皮肤传感器，它在压力、温度和湿度的感知方面具有巨大的潜力。
