Abstract Stretchable and transparent strain sensors based on conductive polymer composites (CPCs) possess potential applications in a variety of fields, including electronic skin, wearable electronics, and human motion detection. However, it is still a challenge to prepare CPC-based strain sensors with both good transparency and broad sensing range by a low-cost, facile, and scalable fabrication method. Herein, we report a simple spray deposition and transfer method to fabricate a stretchable and transparent strain sensor based on the sandwich-like polydimethylsiloxane (PDMS)/carbon nanotubes (CNTs)/PDMS composite containing with an ultrathin and uniform conductive layer. The fabricated strain sensors exhibit superb stretchability, good optical transparency, and excellent sensing performances, which can detect both the subtle and large strains with outstanding stability and repeatability. For example, the strain sensor based on PDMS/CNTs/PDMS composite (containing 0.16 mg/cm2 CNTs on the conductive layer) presents a good optical transmittance of 53.1% at 550 nm, broad sensing range of over 130%, and the ability to monitor both the subtle motions of facial expressions and the large motions of human joints, which has great potential applications in human motion detection, wearable electronics, and electronic skin.

中文翻译：

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基于包含超薄导电CNT层的三明治状PDMS/CNTs/PDMS复合材料的可拉伸透明应变传感器

摘要 基于导电聚合物复合材料 (CPC) 的可拉伸透明应变传感器在电子皮肤、可穿戴电子产品和人体运动检测等多个领域具有潜在的应用价值。然而，通过低成本、简便和可扩展的制造方法制备具有良好透明度和宽传感范围的基于 CPC 的应变传感器仍然是一个挑战。在此，我们报告了一种简单的喷涂沉积和转移方法，以制造基于夹心状聚二甲基硅氧烷 (PDMS)/碳纳米管 (CNT)/PDMS 复合材料的可拉伸透明应变传感器，该复合材料含有超薄且均匀的导电层。制造的应变传感器表现出极好的拉伸性、良好的光学透明度和优异的传感性能，它可以检测细微和大应变，具有出色的稳定性和可重复性。例如，基于 PDMS/CNTs/PDMS 复合材料（导电层上含有 0.16 mg/cm2 CNTs）的应变传感器在 550 nm 处具有 53.1% 的良好透光率，超过 130% 的宽传感范围，以及监测面部表情的细微运动和人体关节的大运动，在人体运动检测、可穿戴电子产品和电子皮肤方面具有巨大的潜在应用。