Fluorophore-assisted synthesis of silver flowers on copper-patterned flexible substrates for SERS detection of thiram residues on apples

IF 9.8 1区农林科学 Q1 CHEMISTRY, APPLIED

Food Chemistry Pub Date : 2025-07-21 DOI:10.1016/j.foodchem.2025.145656

Zeynep Dikmen , Gökhan Dikmen , Kürşad Osman Ay , Remzi Aydın , İdris Akyüz

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Abstract

A rapid and non-destructive Surface-Enhanced Raman Spectroscopy (SERS) approach using silver flowers (AgFws) as a substrate was successfully developed for the detection of trace amounts of thiram, a dithiocarbamate fungicide. In this study, we report the facile preparation of AgFws on a copper-coated polyethylene terephthalate (PET) substrate utilizing a “complexation-triggered crystallization” phenomenon. The 2,5-di(pyridin-4-yl)thiazolo[5,4-d]thiazole (Py₂TTz) dye serves as both a reducing agent and a nucleation site for the crystallization of silver ions, forming AgFws on the copper layer, thereby yielding a flexible SERS substrate. The copper coating enhances the formation of AgFws due to the excellent adsorption properties of the Py₂TTz dye. The high surface area-to-volume ratio of the AgFws enables sensitive detection of food contaminants. The developed SERS substrate successfully identified trace amounts of thiram residues on apple peel with a detection limit of 1 pg/cm² and in solutions with a concentration as low as 10⁻¹⁴ M.

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荧光团辅助在铜图案柔性衬底上合成银花用于苹果上硫胺残留的SERS检测

利用银花（AgFws）作为底物，成功地开发了一种快速、非破坏性的表面增强拉曼光谱（SERS）方法，用于检测微量的二硫代氨基甲酸酯杀菌剂thiram。在这项研究中，我们报告了利用“络合触发结晶”现象在铜涂层的聚对苯二甲酸乙二醇酯（PET）衬底上制备AgFws的简便方法。2,5-二（吡啶-4-基）噻唑[5,4-d]噻唑（Py2TTz）染料作为还原剂和银离子结晶的成核位点，在铜层上形成AgFws，从而产生柔性SERS底物。由于Py2TTz染料优异的吸附性能，铜涂层促进了AgFws的形成。AgFws的高表面积体积比使其能够灵敏地检测食品污染物。所开发的SERS底物在浓度低至10−14 M的溶液中，以1 pg/cm2的检出限成功地鉴定了苹果皮上痕量的硫胺残留物。

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来源期刊

Food Chemistry 工程技术-食品科技

CiteScore

16.30

自引率

10.20%

发文量

3130

审稿时长

122 days

期刊介绍： Food Chemistry publishes original research papers dealing with the advancement of the chemistry and biochemistry of foods or the analytical methods/ approach used. All papers should focus on the novelty of the research carried out.