{"title":"A SERS “on–off” sensor for Hg2+ and fumonisin B1 determination in grains based on Au-Janus Ag NPs modified by carbon dots","authors":"Yutong Wang, Xiao Liang, Yaling Yang","doi":"10.1007/s00604-025-07038-8","DOIUrl":null,"url":null,"abstract":"<div><p>Se-WCDs-Au-Janus Ag NPs with weak oxidase activity were synthesized using Se-W carbon dots (Se-WCDs) as stabilizers and reducing agents. These Janus nanoparticles (Janus NPs) effectively catalyze the reduction of mercury ions (Hg<sup>2+</sup>) to metallic mercury (Hg<sup>0</sup>), generating Au–Ag-Hg mercury alloys (Au–Ag@HgNPs). The aggregated Au–Ag@HgNPs on the nanoparticles improve the SERS activity of Se-WCDs-Au-Janus Ag NPs through a synergistic effect of electromagnetic enhancement and chemical enhancement. Interestingly, adding FB1 turns off the Raman signal by inhibiting the aggregation of Au–Ag@HgNPs. Based on these findings, a SERS “on–off” sensor utilizing the Se-WCDs-Au-Janus Ag NPs as the probe was successfully developed to determine fumonisin B1 (FB1) and Hg<sup>2+</sup> in grains. The detection limits were as low as 0.005 μg·L<sup>−1</sup> for Hg<sup>2+</sup> and 0.006 μg·L<sup>−1</sup> for FB1.</p><h3>Graphical abstract</h3>\n<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":705,"journal":{"name":"Microchimica Acta","volume":"192 3","pages":""},"PeriodicalIF":5.3000,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Microchimica Acta","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s00604-025-07038-8","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Se-WCDs-Au-Janus Ag NPs with weak oxidase activity were synthesized using Se-W carbon dots (Se-WCDs) as stabilizers and reducing agents. These Janus nanoparticles (Janus NPs) effectively catalyze the reduction of mercury ions (Hg2+) to metallic mercury (Hg0), generating Au–Ag-Hg mercury alloys (Au–Ag@HgNPs). The aggregated Au–Ag@HgNPs on the nanoparticles improve the SERS activity of Se-WCDs-Au-Janus Ag NPs through a synergistic effect of electromagnetic enhancement and chemical enhancement. Interestingly, adding FB1 turns off the Raman signal by inhibiting the aggregation of Au–Ag@HgNPs. Based on these findings, a SERS “on–off” sensor utilizing the Se-WCDs-Au-Janus Ag NPs as the probe was successfully developed to determine fumonisin B1 (FB1) and Hg2+ in grains. The detection limits were as low as 0.005 μg·L−1 for Hg2+ and 0.006 μg·L−1 for FB1.
以Se-W碳点（Se-WCDs）为稳定剂和还原剂，合成了具有弱氧化酶活性的Se-WCDs- au - janus Ag NPs。这些Janus纳米颗粒（Janus NPs）有效地催化汞离子（Hg2+）还原为金属汞（Hg0），生成Au - ag - hg汞合金（Au - Ag@HgNPs）。纳米粒子上聚集的Au- Ag@HgNPs通过电磁增强和化学增强的协同效应提高了Se-WCDs-Au-Janus Ag NPs的SERS活性。有趣的是，加入FB1通过抑制Au - Ag@HgNPs的聚集来关闭拉曼信号。基于这些发现，利用Se-WCDs-Au-Janus Ag NPs作为探针，成功开发了一种SERS“开关”传感器，用于测定谷物中的伏马菌素B1 （FB1）和Hg2+。Hg2+和FB1的检出限分别为0.005 μg·L−1和0.006 μg·L−1。图形抽象
期刊介绍：
As a peer-reviewed journal for analytical sciences and technologies on the micro- and nanoscale, Microchimica Acta has established itself as a premier forum for truly novel approaches in chemical and biochemical analysis. Coverage includes methods and devices that provide expedient solutions to the most contemporary demands in this area. Examples are point-of-care technologies, wearable (bio)sensors, in-vivo-monitoring, micro/nanomotors and materials based on synthetic biology as well as biomedical imaging and targeting.
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