Surface-enhanced Raman scattering (SERS) substrates with low cost, high sensitivity and good reproducibility are still challenging in practical application. Herein, we propose a facile method to prepare monolayer ZnS@Ag nanospheres (NSs) by sputtering Ag nanoparticles (NPs) on the surfaces of the monolayer ZnS NSs produced by self-assembly. The monolayer ZnS@Ag NSs have rough surface and nanoscale gaps, which can produce large SERS effect. The dye molecules, Rhodamine 6G (R6G) and Rhodamine B (RhB), were used as probe to evaluate the SERS performance on the monolayer ZnS@Ag NSs. It was found that the monolayer ZnS@Ag NSs showed the high SERS sensitivity in the detection of R6G and RhB, the limit of detection (LOD) down to 9.12×10−13 M and 8.55×10−11 M, respectively. The corresponding enhancement factors (EF) are 3.01×108 and 8.2×106, respectively. Furthermore, the ordered structure makes the monolayer ZnS@Ag NSs substrate with high signal reproducibility and stability, and the relative standard deviation (RSD) values are less than 15%. Therefore, the monolayer ZnS@Ag NSs is a candidate for detecting organic dyes in the environment.

中文翻译：

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用于高灵敏度染料分子检测的单层 ZnS@Ag 纳米球 SERS 底物

具有低成本、高灵敏度和良好重现性的表面增强拉曼散射 (SERS) 基板在实际应用中仍然具有挑战性。在此，我们提出了一种简便的方法来制备单层 ZnS@Ag 纳米球 (NSs)，方法是在自组装产生的单层 ZnS NSs 表面溅射 Ag 纳米颗粒 (NPs)。单层ZnS@Ag NSs具有粗糙的表面和纳米级间隙，可以产生较大的SERS效应。染料分子罗丹明 6G (R6G) 和罗丹明 B (RhB) 用作探针来评估单层 ZnS@Ag NSs 上的 SERS 性能。发现单层 ZnS@Ag NSs 在检测 R6G 和 RhB 时表现出较高的 SERS 灵敏度，检测限 (LOD) 低至 9.12×10-13M 和 8.55×10-11米，分别。相应的增强因子（EF）为3.01×108和 8.2×106， 分别。此外，有序结构使得单层ZnS@Ag NSs衬底具有高信号再现性和稳定性，相对标准偏差（RSD）值小于15%。因此，单层 ZnS@Ag NSs 是检测环境中有机染料的候选材料。