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A needle-like reusable surface-enhanced Raman scattering substrate, and its application to the determination of acetamiprid by combining SERS and thin-layer chromatography
Microchimica Acta ( IF 5.3 ) Pub Date : 2018-10-09 , DOI: 10.1007/s00604-018-3034-9
Yan Kang , Ting Wu , Xiaozhen Han , Haixin Gu , Xin Zhang

AbstractA micro surface-enhanced Raman scattering (SERS) substrate has been fabricated by electrochemical deposition of dendrite-like gold on carbon fiber needles (Au-CFNs). Scanning electron microscopy and energy dispersive spectroscopy were used to confirm the presence of the gold nanostructure on the CFNs. This substrate has a Raman scattering enhancement factor as high as 3.3 × 10^7 when using rhodamine 6G as the reporter molecule. The high SERS sensitivity is attributed to the massive hotspots on gold bulges that enhance the local surface plasmon resonance. The Au-CFN substrate was reproduced 10 times after electrochemically wiping off the analytes from the needle-like electrode. The substrate has attractive features such as convenient sampling, low sample dosage, and minimal invasion. It was applied, in combination with thin-layer chromatography, for the determination of acetamiprid on vegetables. The result was more accurate because the sample information of both the surface and the bulk can be obtained at the same time after inserting the tip of this needle substrate into the TLC plate. The limit of detection for acetamiprid is 0.05 μg⋅mL-1 and the linear range is 0.1–10 μg⋅mL-1. Graphical abstractA reusable micro needle-like SERS substrate was fabricated and applied for pesticide residue analysis. The SERS signal of acetamiprid can be acquired on the tip of this micro needle-like Au-CFN substrate. This substrate can be reused for 10 times.

中文翻译:

一种针状可重复使用的表面增强拉曼散射基质及其在结合 SERS 和薄层色谱法测定啶虫脒中的应用

摘要 通过在碳纤维针(Au-CFNs)上电化学沉积枝晶状金制备了微表面增强拉曼散射(SERS)衬底。扫描电子显微镜和能量色散光谱用于确认 CFN 上金纳米结构的存在。当使用罗丹明 6G 作为报告分子时,该基板具有高达 3.3 × 10^7 的拉曼散射增强因子。高 SERS 灵敏度归因于金凸起上的大量热点,这些热点增强了局部表面等离子体共振。Au-CFN 基板在电化学擦除针状电极上的分析物后被复制 10 次。该基板具有取样方便、样品用量少、侵入性小等吸引人的特点。它被应用,与薄层色谱联用,用于蔬菜中啶虫脒的测定。结果更准确,因为在将此针基板的尖端插入 TLC 板后,可以同时获得表面和本体的样品信息。啶虫脒的检测限为 0.05 μg⋅mL-1,线性范围为 0.1–10 μg⋅mL-1。图形摘要制作了可重复使用的微针状 SERS 基板,并将其应用于农药残留分析。可以在这种微针状 Au-CFN 基板的尖端上获取啶虫脒的 SERS 信号。此基板可重复使用 10 次。结果更准确,因为在将此针基板的尖端插入 TLC 板后,可以同时获得表面和本体的样品信息。啶虫脒的检测限为 0.05 μg⋅mL-1,线性范围为 0.1–10 μg⋅mL-1。图形摘要制作了可重复使用的微针状 SERS 基板,并将其应用于农药残留分析。可以在这种微针状 Au-CFN 基板的尖端上获取啶虫脒的 SERS 信号。此基板可重复使用 10 次。结果更准确,因为在将此针基板的尖端插入 TLC 板后,可以同时获得表面和本体的样品信息。啶虫脒的检测限为 0.05 μg⋅mL-1,线性范围为 0.1–10 μg⋅mL-1。图形摘要制作了可重复使用的微针状 SERS 基板,并将其应用于农药残留分析。可以在这种微针状 Au-CFN 基板的尖端上获取啶虫脒的 SERS 信号。此基板可重复使用 10 次。可以在这种微针状 Au-CFN 基板的尖端上获取啶虫脒的 SERS 信号。此基板可重复使用 10 次。可以在这种微针状 Au-CFN 基板的尖端上获取啶虫脒的 SERS 信号。此基板可重复使用 10 次。
更新日期:2018-10-09
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