Abstract Cavity array, with excellent optical capture capability, has received increasing attention for the surface-enhanced Raman spectroscopy (SERS)-active substrates. Here, we proposed molybdenum disulfide (MoS2) nanocavities growing on pyramid Si (PSi) composed of in situ reduced Au nanoparticles (AuNPs), which can form the multiscale cavities (MSCs), and is facile for the couple of the plasmon. We demonstrated that the PSi/MoS2/Au MSCs can serve as highly sensitive, uniform, and stable SERS substrates for rhodamine 6G (R6G), crystal violet, and adenosine triphosphate detection, benefiting from the synergistic effect of the enhanced light trapping and the effective plasmonic couple. The couple of the plasmon in the MSCs is evidently proved by finite-difference time domain simulation, showing the strong electromagnetic field is located around the cavity wall. Moreover, the excellent hydrophobicity of the PSi/MoS2/AuNPs substrate endows it with the ability for the directional monitoring of organic pollutant in a mixture of oil and water. Finally, we demonstrated the MSCs with outstanding photocatalytic performance could achieve the renewable utilization by self-cleaning, which was attributed to the fast electron transfer and effective light absorption. The proposed PSi/MoS2/AuNPs MSC represents a robust mean using the plasmonic metal/semiconductor heterostructure for high-performance SERS sensors and photodegradation.

中文翻译：

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用于高性能和自清洁表面增强拉曼光谱 (SERS) 传感的疏水多尺度腔

摘要 腔阵列具有优异的光学捕获能力，在表面增强拉曼光谱 (SERS) 活性基底方面受到越来越多的关注。在这里，我们提出了在由原位还原的金纳米粒子 (AuNPs) 组成的金字塔 Si (PSi) 上生长的二硫化钼 (MoS2) 纳米腔，它可以形成多尺度腔 (MSC)，并且易于形成等离子激元对。我们证明了 PSi/MoS2/Au MSCs 可以作为高灵敏度、均匀和稳定的 SERS 底物用于罗丹明 6G (R6G)、结晶紫和三磷酸腺苷检测，受益于增强的光捕获和有效的协同效应。等离子体偶。有限差分时域模拟明显证明了 MSC 中的等离子体对，显示强电磁场位于腔壁周围。此外，PSi/MoS2/AuNPs 基板优异的疏水性使其能够定向监测油水混合物中的有机污染物。最后，我们证明了具有出色光催化性能的 MSCs 可以通过自清洁实现可再生利用，这归因于快速的电子转移和有效的光吸收。拟议的PSi/MoS2/AuNPs MSC 代表了使用等离子体金属/半导体异质结构用于高性能SERS 传感器和光降解的稳健手段。我们证明了具有出色光催化性能的 MSCs 可以通过自清洁实现可再生利用，这归因于快速的电子转移和有效的光吸收。拟议的PSi/MoS2/AuNPs MSC 代表了使用等离子体金属/半导体异质结构用于高性能SERS 传感器和光降解的稳健手段。我们证明了具有出色光催化性能的 MSCs 可以通过自清洁实现可再生利用，这归因于快速的电子转移和有效的光吸收。所提出的 PSi/MoS2/AuNPs MSC 代表了使用等离子体金属/半导体异质结构用于高性能 SERS 传感器和光降解的稳健手段。