SERS Nanosensor for the Detection of Ag(I) Ions under High-Chloride Environment: Breaking Chloride Masking Effect,ACS Applied Nano Materials

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SERS Nanosensor for the Detection of Ag(I) Ions under High-Chloride Environment: Breaking Chloride Masking Effect
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2023-11-30 , DOI: 10.1021/acsanm.3c05160
Zhiyang Zhang _{1,

2} , Meichun Liu _{1,

3} , Yanzhou Wu ₁ , Yanhui Zhang ₄ , Yan Chen _{1,

3} , Ji Qi ₁ , Jianping Wang _{3,

5} , Jinmao You _{4,

6} , Lingxin Chen _{1,

2,

7}

Affiliation

The use of chemical sensors for the detection of Ag(I) ions under a chloride (Cl^–) environment is extremely difficult due to the chloride masking effect. Herein, a surface-enhanced Raman scattering (SERS) nanosensor using p-aminothiophenol (PATP) as probe molecules has been developed for the detection of Ag(I) ions under high concentrations of Cl^– ions. The peak intensity ratio I₄₃₈/I₃₉₀ was used as the basis for the quantitative analysis, showing a high selectivity for Ag(I) ions. Corroborating with DFT simulations, the origin of the sensing mechanism is the existence of coordination between Ag(I) ions and PATP. To enhance the sensitivity of the SERS nanosensors, we propose a sequence-dependent probe modification method by decreasing the Raman signal from the isolated probe molecules in the nanogaps of nanoparticles. More significantly, this breakthrough SERS sensor addresses a long-standing issue of conventional Ag(I) sensors for the detection of total Ag(I) ions under a high-chloride environment. Even at ultrahigh concentrations (up to 500 mM) of Cl^– ions, this method still breaks the chloride masking effect and exhibits outstanding sensitivity with a limit of detection (LOD) of 0.07 μM for Ag(I) ions. In addition, the successful detection of Ag(I) ions in the real samples with Cl^– ions indicates that our method has promise for practical applications. These findings have significant implications for future research on heavy-metal analysis in complex samples.

中文翻译：

用于高氯环境下 Ag(I) 离子检测的 SERS 纳米传感器：打破氯掩蔽效应

由于氯化物掩蔽效应，在氯化物 (Cl ^– ) 环境下使用化学传感器检测 Ag(I) 离子极其困难。在此，开发了一种使用对氨基苯硫酚（PATP）作为探针分子的表面增强拉曼散射（SERS）纳米传感器，用于在高浓度^Cl离子下检测Ag（I）离子。峰强度比I ₄₃₈ / I ₃₉₀用作定量分析的基础，显示出对 Ag(I) 离子的高选择性。与 DFT 模拟相证实，传感机制的起源是 Ag(I) 离子和 PATP 之间的配位存在。为了提高SERS纳米传感器的灵敏度，我们提出了一种序列依赖性探针修饰方法，通过减少纳米粒子纳米间隙中孤立探针分子的拉曼信号。更重要的是，这种突破性的 SERS 传感器解决了传统 Ag(I) 传感器在高氯环境下检测总 Ag(I) 离子的长期存在的问题。即使在超高浓度（高达 500 mM）的 Cl ^-离子下，该方法仍能打破氯离子掩蔽效应，并表现出出色的灵敏度，Ag(I) 离子的检测限 (LOD) 为 0.07 μM。此外，用Cl离子成功检测实际样品中的Ag(I)离子^表明我们的方法具有实际应用前景。这些发现对复杂样品中重金属分析的未来研究具有重要意义。

更新日期：2023-11-30

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