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首页> 外文期刊>Analytical and bioanalytical chemistry >In situ laser-induced photochemical silver substrate synthesis and sequential SERS detection in a flow cell
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In situ laser-induced photochemical silver substrate synthesis and sequential SERS detection in a flow cell

机译：流通池中的原位激光诱导光化学银底物合成和顺序SERS检测

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摘要

A new, simple, and effective approach for multianalyte sequential surface-enhanced Raman scattering (SERS) detection in a flow cell is reported. The silver substrate was prepared in situ by laser-induced photochemical synthesis. By focusing the laser on the 320 μminner diameter glass capillary at 0.5 ml/min continuous flow of 1 mM silver nitrate and 10 mM sodium citrate mixture, a SERS active silver spot on the inner wall of the glass capillary was prepared in a few seconds. The test analytes, dacarbazine, 4-(2-pyridylazo) resorcinol (PAR) complex with Cu(II), and amoxicillin, were sequentially injected into the flow cell. Each analyte was adsorbed to the silver surface, enabling the recording of high intensity SERS spectra even at 2 s integration times, followed by desorption from the silver surface and being washed away from the capillary. Before and after each analyte passed the detection window, citrate background spectra were recorded, and thus, no “memory effects” perturbed the SERS detection. A good reproducibility of the SERS spectra obtained under flow conditions was observed. The laser-induced photochemically synthesized silver substrate enables high Raman enhancement, is characterized by fast preparation with a high success rate, and represents a valuable alternative for silver colloids as SERS substrate in flow approaches.
机译：报告了一种新的，简单，有效的方法，用于流通池中的多分析物顺序表面增强拉曼散射（SERS）检测。通过激光诱导的光化学合成原位制备银基底。通过将激光聚焦在直径为320μmin的玻璃毛细管上，以0.5 ml / min的速度连续流动1 mM硝酸银和10 mM柠檬酸钠的混合物，在几秒钟内制备了玻璃毛细管内壁上的SERS活性银点。将测试分析物达卡巴嗪，4-（2-吡啶基偶氮）间苯二酚（PAR）与Cu（II）的络合物以及阿莫西林依次注入流动池中。每种分析物都吸附到银表面，即使在2 s积分时间下也可以记录高强度SERS光谱，然后从银表面解吸，然后从毛细管上冲走。在每种分析物通过检测窗口之前和之后，都会记录柠檬酸盐的背景光谱，因此，没有“记忆效应”干扰SERS检测。观察到在流动条件下获得的SERS光谱具有良好的重现性。激光诱导的光化学合成银基质可实现高拉曼增强，其特征在于快速制备且成功率高，并且代表了银胶体作为流动方法中的SERS基质的宝贵替代品。

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