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Highly reusable nanoporous silver sheet for sensitive SERS detection of pesticides

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Abstract

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.

Graphical abstract: Highly reusable nanoporous silver sheet for sensitive SERS detection of pesticides

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Supplementary files

Article information


Submitted
18 May 2020
Accepted
19 Jun 2020
First published
19 Jun 2020

Analyst, 2020, Advance Article
Article type
Paper

Highly reusable nanoporous silver sheet for sensitive SERS detection of pesticides

H. Chi, C. Wang, Z. Wang, H. Zhu, V. St. D. Mesias, X. Dai, Q. Chen, W. Liu and J. Huang, Analyst, 2020, Advance Article , DOI: 10.1039/D0AN00999G

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