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Two-dimensional MXene modified AgNRs as a surface-enhanced Raman scattering substrate for sensitive determination of polychlorinated biphenyls.
Analyst ( IF 3.6 ) Pub Date : 2020-09-09 , DOI: 10.1039/d0an01489c
Xuejiao Fang 1 , Yuhang Song , Yi Huang , Guohai Yang , Caiqin Han , Haitao Li , Lulu Qu
Affiliation  

Ultrathin two-dimensional MXene nanosheets were decorated on the surface of silver nanorods (AgNRs) through a facile modification strategy to prepare highly sensitive and reproducible SERS substrates (AgNR/MXene substrate). The MXene nanosheets could suppress the oxidation of the silver nanorods, which endows the substrate with good stability and reproducibility. Due to the strong interaction between AgNR/MXene and the analytes, the substrate also exhibited high SERS performance with the limit of detection (LOD) of crystal violet (CV) as low as 2.48 × 10−11 M. In particular, the AgNR/MXene substrate enabled on-site determination of 3,3′,4,4′-tetrachlorobiphenyl (PCB-77) and 4-chlorobiphenyl (PCB-3) and the LODs were low at 2.43 × 10−10 and 2.14 × 10−9 M, respectively. In addition, the AgNR/MXene substrate could be used for the detection of single-component and multi-component PCBs in real soil samples with good recovery percentages (90.3% and 91.6% for PCB-3 and PCB-77 in single-component format, 108.1% and 106.5% for PCB-3 and PCB-77 in multi-component format). The AgNR/MXene substrate combines the synergistic properties of both AgNRs and MXene, showing great potential in simultaneous SERS detection of multiple pollutants at the point of need.

中文翻译:

二维MXene修饰的AgNRs作为表面增强的拉曼散射底物,用于灵敏测定多氯联苯。

通过一种简便的修饰策略,将超薄二维MXene纳米片装饰在银纳米棒(AgNRs)的表面上,以制备高度敏感且可重现的SERS基底(AgNR / MXene基底)。MXene纳米片可以抑制银纳米棒的氧化,从而赋予基材良好的稳定性和可重复性。由于AgNR / MXene和分析物之间的强相互作用,衬底也显示出高的性能SERS用结晶紫(CV)为低的检测限(LOD)的极限为2.48×10 -11 M.具体地,AgNR / MXene底物可现场测定3,3',4,4'-四氯联苯(PCB-77)和4-氯联苯(PCB-3),LOD较低,分别为2.43×10 -10和2.14×10 -9M分别。此外,AgNR / MXene底物可用于检测真实土壤样品中的单组分和多组分PCB,回收率高(单组分形式的PCB-3和PCB-77的回收率分别为90.3%和91.6% ,多组件格式的PCB-3和PCB-77分别为108.1%和106.5%)。AgNR / MXene底物结合了AgNRs和MXene的协同特性,在需要时在多种污染物的同时SERS检测中显示出巨大的潜力。
更新日期:2020-09-20
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