In Situ Recyclable Surface-Enhanced Raman Scattering-Based Detection of Multicomponent Pesticide Residues on Fruits and Vegetables by the Flower-like MoS2@Ag Hybrid Substrate
In Situ Recyclable Surface-Enhanced Raman Scattering-Based Detection of Multicomponent Pesticide Residues on Fruits and Vegetables by the Flower-like MoS2@Ag Hybrid Substrate
复制标题
基于花状 MoS2@Ag 混合基质的原位可回收表面增强拉曼散射检测水果和蔬菜上的多组分农药残留
DOI：
10.1021/acsami.9b22725
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发表时间：
2020-03-25
影响因子：
9.5
通讯作者：
Zhou, Jun
中科院分区：
文献类型：
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作者：
Chen, Ying;Liu, Hongmei;Zhou, Jun
农药作为农业生产中广泛使用的一种农药，由于其对环境和人类健康的潜在威胁而受到极大关注。因此，本研究开发了一种高灵敏度、高稳定性的二维硫化钼-银（MoS2@Ag）杂化表面增强拉曼散射（SERS）活性基底，并将其应用于多种果蔬农药残留的可回收检测。首先，MoS2@Ag杂化基底具有优异的光催化性能，这是由于Ag纳米颗粒与MoS2基体之间形成肖特基势垒后，电子-空穴结合受到抑制。在此基础上，建立了福美双（二硫化四甲基秋兰姆，TMTD）和甲基双硫磷（MP）标准溶液的两条超低检测限（LOD）分别为6.4 × 10~（-7）和9.8 × 10~（-7）mg/mL的标准曲线，实现了茄子、白菜、葡萄和草莓上福美双和甲基双硫磷单一和混合残留的可回收测定。值得注意的是，TMTD和MP的检测回收率分别为95.5 - 63.1%和92.3 - 62.6%，这在很大程度上取决于这些食品的尺寸和表面粗糙度。综上所述，MoS2@Ag复合基质显示出了良好的SERS和拉曼性能，有望在食品安全监测方面具有潜在的应用前景。
Pesticides, extensively used in agriculture production, have received enormous attention because of their potential threats to the environment and human health. Hence, in this study, a kind of highly sensitive and stable hybrid surface-enhanced Raman scattering (SERS)-active substrates constructed with flower-like two-dimensional molybdenum sulfide and Ag (MoS2@Ag) has been developed, and then the above substrate was sequentially utilized in the recyclable detection of pesticide residues on several kinds of fruits and vegetables. In the first place, the excellent photocatalytic performance of the MoS2@Ag hybrid substrate was demonstrated, which was attributed to the inhibition of electron-hole combination after the formation of Schottky barrier between the Ag NPs and MoS2 matrix. Thereafter, two calibration curves with ultra-low limits of detection (LOD) as 6.4 x 10(-7) and 9.8 x 10(-7) mg/mL were established for the standard solutions of thiram (tetramethylthiuram disulfide, TMTD) and methyl parathion (MP), and then the recyclable assay of their single and mixed residues on eggplant, Chinese cabbage, grape, and strawberry was successfully realized. It is interesting to note that the detection recoveries from 95.5 to 63.1% for TMTD and 92.3 to 62.6% for MP are greatly dependent on the size and surface roughness of these foods. In a word, the MoS2@Ag composite matrix shows attractive SERS and photocatalysis performance, and it is expected to have the potential application on food safety monitoring.