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Seeing Is Not Necessarily Believing: Is the Surface-Enhanced Raman Spectroscopy Signal Really from the Target?
Analytical Chemistry ( IF 6.7 ) Pub Date : 2023-08-23 , DOI: 10.1021/acs.analchem.3c02683
Si-Qi Pan 1 , Ping Luo 2 , Jia Chen 3 , Tairui Wu 2 , Bin Xu 3 , Fushan Chen 2 , De-Yin Wu 2 , Bin Ren 2 , Guo-Kun Liu 1 , Jianwei Xie 3 , Pengxiang Xu 2 , Zhong-Qun Tian 2
Affiliation  

Reagent purity is crucial to experimental research, considering that the ignorance of ultratrace impurities may induce wrong conclusions in either revealing the reaction nature or qualifying the target. Specifically, in the field of surface science, the strong interaction between the impurity and the surface will bring a non-negligible negative effect. Surface-enhanced Raman spectroscopy (SERS) is a highly surface-sensitive technique, providing fingerprint identification and near-single molecule sensitivity. In the SERS analysis of trace chloromethyl diethyl phosphate (DECMP), we figured out that the SERS performance of DECMP is significantly distorted by the trace impurities from DECMP. With the aid of gas chromatography-based techniques, one strongly interfering impurity (2,2-dichloro-N,N-dimethylacetamide), the byproduct during the synthesis of DECMP, was confirmed. Furthermore, the nonignorable interference of impurities on the SERS measurement of NaBr, NaI, or sulfadiazine was also observed. The generality ignited us to refresh and consolidate the guideline for the reliable SERS qualitative analysis, by which the potential misleading brought by ultratrace impurities, especially those strongly adsorbed on Au or Ag surfaces, could be well excluded.

中文翻译:

眼见不一定为实:表面增强拉曼光谱信号真的来自目标吗?

试剂纯度对于实验研究至关重要,因为不了解超痕量杂质可能会在揭示反应性质或鉴定目标时得出错误的结论。具体来说,在表面科学领域,杂质与表面之间的强烈相互作用会带来不可忽视的负面影响。表面增强拉曼光谱 (SERS) 是一种高度表面敏感的技术,可提供指纹识别和接近单分子的灵敏度。在痕量磷酸氯甲基二乙酯 (DECMP) 的 SERS 分析中,我们发现 DECMP 的 SERS 性能因 DECMP 中的痕量杂质而显着扭曲。借助基于气相色谱的技术,确认了 DECMP 合成过程中的副产物一种强干扰杂质(2,2-二氯-N , N-二甲基乙酰胺)。此外,还观察到杂质对 NaBr、NaI 或磺胺嘧啶的 SERS 测量存在不可忽略的干扰。这种普遍性促使我们刷新和巩固可靠的SERS定性分析指南,从而可以很好地排除超痕量杂质,特别是那些强烈吸附在金或银表面上的杂质带来的潜在误导。
更新日期:2023-08-23
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