A new sensor for determination of Ag+ ion (Ag+) by surface-enhanced Raman scattering (SERS) is reported. Gold nanoparticles (AuNPs) and 4-aminodiphenyl disulfide (APDS) were chosen as the SERS substrate and probe molecule, respectively. With the addition of Ag+, three new peaks (1141, 1392, and 1435 cm−1) appeared in the SERS spectrum, indicating that the conversion of APDS to p,p′-dimercaptoazobenzene (DMAB) was achieved. As the concentration of Ag+ increased, the conversion of APDS to DMAB also increased and showed a good linear relationship (R2 = 0.9746) in the range of 10 to 100 μM of Ag+. The limit of detection (LOD) was 7 μM. Compared with the traditional determination method, the SERS method is convenient and fast and requires no complicated preprocessing. Graphical abstract Graphical abstract

中文翻译：

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表面等离子体催化氧化 4-氨基二苯二硫醚，用于测定水样中的 Ag+ 离子

报告了一种通过表面增强拉曼散射 (SERS) 测定 Ag+ 离子 (Ag+) 的新传感器。金纳米粒子 (AuNPs) 和 4-氨基二苯基二硫化物 (APDS) 分别被选为 SERS 基底和探针分子。添加 Ag+ 后，SERS 光谱中出现了三个新峰（1141、1392 和 1435 cm-1），表明实现了 APDS 向 p,p'-二巯基偶氮苯（DMAB）的转化。随着 Ag+ 浓度的增加，APDS 向 DMAB 的转化率也增加，并在 10 到 100 μM 的 Ag+ 范围内显示出良好的线性关系（R2 = 0.9746）。检测限 (LOD) 为 7 μM。与传统测定方法相比，SERS法方便快捷，无需复杂的前处理。图形摘要图形摘要