Highly reusable nanoporous silver sheet for sensitive SERS detection of pesticides

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...

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Bibliographic Details
Published in:Analyst (London) 2020-08, Vol.145 (15), p.5158-5165
Main Authors: Chi, Huanyu, Wang, Congcheng, Wang, Zhien, Zhu, Hongni, Mesias, Vince St. Dollente, Dai, Xin, Chen, Qing, Liu, Wei, Huang, Jinqing
Format: Article
Language:English
Subjects:
Cost analysis
Hydrocarbons, Chlorinated
Mass production
Metal surfaces
Morphology
Nanopores
Pesticides
Pesticides - analysis
Raman spectroscopy
Regeneration
Regulators
Rhodamine
Silver
Spectrum Analysis, Raman
Substrates
Ultrasonic cleaning
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Summary: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. Reusing nanoporous Ag sheets 20 times after simple ultrasonic cleaning for sensitive SERS detection of organochlorine pesticides.
ISSN:0003-2654
1364-5528
DOI:10.1039/d0an00999g