AbstractCore-shell nanoparticles (NPs) consisting of a gold core and a metal-organic framework shell (type MOF-74) were synthesized via one-pot synthesis. The NPs exhibit highly sensitive and stable SERS activity for the detection of 4-nitrothiophenol, with a specific band at 1337 cm−1. The method has a linear response in 0.10–10 μmol·L−1 analyte concentration range and a lower detection limit of 69 nmol·L−1. The potential application of this novel SERS substrate was evaluated by two model reactions involving 4-nitrothiophenol. The first involves in-situ SERS monitoring of the surface plasmon-induced nitration of aromatic rings without adding conventional acid catalyst. The second involves the photocatalytic reduction of 4-nitrothiophenol to 4-thioaminophenol in the presence of Au/MOF-74 under 785-nm laser irradiation. The plasmon-assisted dimerization of 4-nitrothiophenol to form 4,4′-dimercaptoazobenzene can also be monitored simultaneously. Graphical abstractSchematic presentation of a nanoparticle SERS substrate consisting of gold core and MOF-74 shell, which was applied to detection of 4-nitrothiophenol. The Au/MOF-74 was successfully used for in-situ monitoring of two model reactions involving 4-nitrothiophenol by SERS.

中文翻译：

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由金纳米粒子和金属有机骨架（MOF-74 型）制备的复合物，用于通过表面增强拉曼光谱测定 4-硝基苯硫酚

摘要 通过一锅法合成了由金核和金属有机骨架壳（MOF-74 型）组成的核壳纳米粒子 (NPs)。NPs 在检测 4-硝基苯硫酚时表现出高度灵敏和稳定的 SERS 活性，在 1337 cm-1 处有一个特定的谱带。该方法在 0.10–10 μmol·L-1 分析物浓度范围内具有线性响应，检测下限为 69 nmol·L-1。这种新型 SERS 底物的潜在应用通过两个涉及 4-硝基苯硫酚的模型反应进行了评估。第一个涉及在不添加常规酸催化剂的情况下对表面等离子体激元诱导的芳环硝化进行原位 SERS 监测。第二个涉及在 785 nm 激光照射下在 Au/MOF-74 存在下将 4-硝基苯硫酚光催化还原为 4-硫代氨基苯酚。也可以同时监测 4-硝基苯硫酚的等离子体辅助二聚形成 4,4'-二巯基偶氮苯。由金核和 MOF-74 壳组成的纳米粒子 SERS 基底的示意图，用于检测 4-硝基苯硫酚。Au/MOF-74 成功地用于通过 SERS 对涉及 4-硝基苯硫酚的两个模型反应进行原位监测。