In recent years, the -conjugated organic molecular system has attracted considerable attention for its surface-enhanced Raman scattering (SERS) properties. However, the practical application of -conjugated organic materials as SERS substrates is limited due to the inefficient dissociation of excitons, weak enhancement, and poor reproducibility. Herein, we proposed a novel nanowall SERS heterocomposite based on 3D D(CCO)-BTBT nanowalls and 2D few-layer MoS flakes. A significant SERS activity of the D(CCO)-BTBT/MoS nanowall heterocomposite can be achieved by the charge transfer (CT) resonance enabled by the -conjugated interactions between D(CCO)-BTBT and MoS and the electromagnetic field spatial distribution induced by the D(CCO)-BTBT nanowalls. The concentration limit of detection (LOD) of the methylene blue (MB) molecules absorbed on the heterostructured D(CCO)-BTBT/MoS nanowall substrate is as low as 8.2 × 10 M, which is excellent among the reported organic-based substrates. A practical SERS detection for the 100 nm polystyrene (PS) nanoparticles on the D(CCO)-BTBT/MoS substrates can be down to 4.5 × 10 ng/L, which is exceptional for the real-time monitoring of emerging contaminants based on SERS technology. This research not only provides a new SERS enhancement strategy for organic-based materials, but also may be helpful in exploring a potential candidate for SERS detection of emerging contaminants.

中文翻译：

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异质结构有机/MoS2 纳米墙具有协同 SERS 增强功能，可直接、灵敏地检测污染物

近年来，π共轭有机分子体系因其表面增强拉曼散射（SERS）特性而引起了广泛关注。然而，由于激子解离效率低、增强作用弱、重现性差等原因，β-共轭有机材料作为SERS基底的实际应用受到限制。在此，我们提出了一种基于 3D D(CCO)-BTBT 纳米墙和 2D 少层 MoS 薄片的新型纳米墙 SERS 异质复合材料。D(CCO)-BTBT/MoS 纳米壁异质复合材料的显着 SERS 活性可以通过 D(CCO)-BTBT 和 MoS 之间的共轭相互作用实现的电荷转移 (CT) 共振以及由D(CCO)-BTBT 纳米墙。异质结构 D(CCO)-BTBT/MoS 纳米壁基板上吸附的亚甲基蓝 (MB) 分子的检测浓度限 (LOD) 低至 8.2 × 10 M，在已报道的有机基基板中表现优异。D(CCO)-BTBT/MoS 基底上的 100 nm 聚苯乙烯 (PS) 纳米颗粒的实用 SERS 检测可低至 4.5 × 10 ng/L，这对于基于 SERS 实时监测新兴污染物来说非常出色技术。这项研究不仅为有机材料提供了一种新的 SERS 增强策略，而且可能有助于探索新兴污染物 SERS 检测的潜在候选者。