We proposed a sensor architecture for surface-enhanced Raman scattering (SERS) based on Fe ion doped LN (FLN) crystal, which was modified by large-area laser-induced periodic surface structures (LIPSS) and subsequently decorated with Ag nanoparticles (Ag NPs). Based on such a FLN/LIPSS/Ag substrate, strikingly boosted SERS enhancement was obtained at constant temperature owing to the LIPSS-related hot spot improvement. Benefiting from the pyroelectric effect of the FLN crystal, further enhanced SERS was achieved under heating and cooling processes, which can be ascribed to the additional charge transfer between molecules and Ag NPs triggered by pyroelectric potential. The experimental results highlight the high fabrication efficiency, ultrasensitivity, high uniformity, and high universality of the substrate, integrating the advantages of both LIPSS and the FLN crystal. More interestingly, selective suppression of Raman signals under cooling processes was observed, which further extends the applications of the FLN/LIPSS/Ag substrate for the detection of molecule complexes such as lake water polluted by crystal violet and 4-aminothiophenol molecules.

中文翻译：

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用于热释电 SERS 分析的 Fe 离子掺杂 LN 晶体上的激光诱导周期性表面结构


我们提出了一种基于铁离子掺杂 LN (FLN) 晶体的表面增强拉曼散射 (SERS) 传感器架构，该晶体通过大面积激光诱导周期性表面结构 (LIPSS) 进行修饰，随后用银纳米粒子 (Ag NPs) 进行修饰）。基于这种 FLN/LIPSS/Ag 基板，由于 LIPSS 相关热点的改善，在恒温下获得了显着增强的 SERS 增强。受益于FLN晶体的热释电效应，在加热和冷却过程中实现了进一步增强的SERS，这可归因于热释电势触发的分子和Ag NPs之间的额外电荷转移。实验结果凸显了衬底的高制造效率、超灵敏度、高均匀性和高通用性，综合了LIPSS和FLN晶体的优点。更有趣的是，观察到冷却过程中拉曼信号的选择性抑制，这进一步扩展了FLN/LIPSS/Ag底物在检测分子复合物（例如被结晶紫和4-氨基苯硫酚分子污染的湖水）方面的应用。