Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul 04620, Korea.
Sensors (Basel). 2022 Apr 2;22(7):2741. doi: 10.3390/s22072741.
Stretchable strain sensors are capable of acquiring data when in contact with human skin or equipment and are widely used in wearable applications. Most strain sensors have tensile properties of less than 20% and have limitations regarding body motion linkage, complex sensor structure, and motion nonreliability. To address these problems, we developed a high tension and high sensitivity sensor with a gauge factor over 40 and tensile stress about 50%. Polydimethylsiloxane (PDMS) was selected as the flexible substrate to ensure tensile strength, and polyaniline (PANI) was used to measure the resistance changes in the sensor. In particular, problems regarding poor uniformity of PANI on PDMS were resolved by surface treatment of the PDMS, wherein PANI polymerization was performed sequentially after forming a self-assembled monolayer (SAM) on the PDMS substrate. O plasma and (3-aminopropyl)triethoxysilane were used to form the SAM. It is expected that this sensor can obtain stable characteristics even under high tensile stress through the evenly formed PANI films on the surface-treated PDMS substrate and may be used in various flexible sensor applications.
可拉伸应变传感器在与人皮肤或设备接触时能够获取数据，因此被广泛应用于可穿戴设备中。大多数应变传感器的拉伸性能小于 20%，并且在身体运动连接、复杂传感器结构和运动可靠性方面存在局限性。为了解决这些问题，我们开发了一种具有超过 40 的应变系数和 50%拉伸应力的高拉伸和高灵敏度传感器。选择聚二甲基硅氧烷（PDMS）作为柔性基底，以确保拉伸强度，并且使用聚苯胺（PANI）来测量传感器中的电阻变化。特别地，通过对 PDMS 进行表面处理解决了 PANI 在 PDMS 上不均匀的问题，其中在 PDMS 基底上形成自组装单分子层（SAM）之后，依次进行 PANI 聚合。使用 O 等离子体和（3-氨丙基）三乙氧基硅烷来形成 SAM。预计，通过在经过表面处理的 PDMS 基底上形成均匀的 PANI 薄膜，这种传感器即使在高拉伸应力下也能获得稳定的特性，并且可能用于各种柔性传感器应用。
