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Highly reusable nanoporous silver sheet for sensitive SERS detection of pesticides.
Analyst ( IF 3.6 ) Pub Date : 2020-06-19 , DOI: 10.1039/d0an00999g
Huanyu Chi 1, 2 , Congcheng Wang 3 , Zhien Wang 2 , Hongni Zhu 1, 2 , Vince St Dollente Mesias 2 , Xin Dai 2 , Qing Chen 1, 2, 3 , Wei Liu 4 , Jinqing Huang 1, 2
Affiliation  

Surface-enhanced Raman spectroscopy (SERS) enables pesticide detection at the point-of-need, but its practical application is limited by expensive and disposable SERS substrates. Here, we report a reusable nanoporous silver (NPAg) sheet for the SERS detection of organochlorine pesticides, aiming to maximize the cost-efficiency of substrate regeneration. The NPAg sheet is prepared by a reduction-induced decomposition method without chemical induced random aggregations. This SERS substrate is sensitive to various analytes regardless of their affinity to a metal surface such as rhodamine B, dichlorodiphenyl-trichloroethane (DDT), and lindane due to its large surface area and the coral rock-like morphology. The SERS signal of lindane, a typical organochlorine pesticide, is identified and quantified with a minimum detectable concentration of 3 × 10−7 M (87 ppb), which is below the maximum residue limits in various foods set by the regulators across the world. More importantly, after a few minutes of ultrasonic cleaning in water, the NPAg sheet can be reused at least 20 times with a reproducible SERS activity. Furthermore, the NPAg sheet remains stable in terms of its sensitivity and reusability after several months of bare strorage. Therefore, the NPAg sheet as a SERS substrate holds great promise for mass production and convenient applications in low-cost pesticide analysis.

中文翻译:

高度可重复使用的纳米多孔银片,用于农药的灵敏 SERS 检测。

表面增强拉曼光谱 (SERS) 可在需要时检测农药,但其实际应用受到昂贵且一次性的 SERS 基底的限制。在这里,我们报告了一种可重复使用的纳米多孔银 (NPAg) 片材,用于有机氯农药的 SERS 检测,旨在最大限度地提高底物再生的成本效益。NPAg 片材是通过还原诱导分解法制备的,没有化学诱导的随机聚集。这种 SERS 基底对各种分析物敏感,无论它们对金属表面的亲和力如何,例如罗丹明 B、二氯二苯基-三氯乙烷 (DDT) 和林丹,因为它具有大表面积和珊瑚岩状形态。对典型有机氯农药林丹的 SERS 信号进行识别和量化,最低检测浓度为 3 × 10−7 M (87 ppb),低于世界各地监管机构在各种食品中设定的最大残留限量。更重要的是,在水中超声清洗几分钟后,NPAg 片材可重复使用至少 20 次,并具有可重现的 SERS 活性。此外,NPAg 片材在经过几个月的裸露储存后,其灵敏度和可重复使用性仍保持稳定。因此,作为 SERS 衬底的 NPAg 片材在大规模生产和低成本农药分析中的便捷应用方面具有广阔的前景。
更新日期:2020-07-30
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