Surface-enhanced Raman spectroscopy (SERS) is an optical technique for molecule identification. However, fabrication of flexible and structured SERS substrates for performance improvement in a facile and cost-effective manner is challenging. In this work, we reported a polytetrafluoroethylene (PTFE)-based flexible SERS substrate by femtosecond laser direct writing (FsLDW) technology. The femtosecond laser-treated PTFE surface is 3D hierarchical micro-/nano-structures, and the structured PTFE-based SERS chip shows excellent performance enhancement. As a result, 10 ⁻⁷ M can be detected, which shows excellent potentials in developing flexible SERS for wearable electronics.

中文翻译：

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飞秒激光结构用于柔性表面增强拉曼光谱衬底

表面增强拉曼光谱（SERS）是一种用于分子鉴定的光学技术。然而，制造柔性且结构化的SERS基板以方便且成本有效的方式提高性能是具有挑战性的。在这项工作中，我们通过飞秒激光直接写入（FsLDW）技术报告了一种基于聚四氟乙烯（PTFE）的柔性SERS基板。飞秒激光处理的PTFE表面是3D分层的微/纳米结构，结构化的基于PTFE的SERS芯片表现出出色的性能增强。结果，可以检测到10 ^-7 M，这在为可穿戴电子设备开发柔性SERS方面显示出极好的潜力。