化学
拉曼散射
等离子体子
银纳米粒子
表面增强拉曼光谱
拉曼光谱
杀虫剂
异质结
纳米颗粒
纳米技术
分析化学(期刊)
光电子学
材料科学
环境化学
光学
农学
物理
生物
作者
Xiaoyi Shi,Yujie Guo,Zhihao Li,Meng He,Zhengdong Zhu,Xu Sun,H. K. Sun,Maofeng Zhang,J.-Y. Li,Youju Huang
摘要
Rapid identification and analysis of pesticide residue on real‐world sample by a portable platform is of growing interest for monitoring food safety and safeguarding human health. Herein, we developed a robust surface‐enhanced Raman spectroscopy (SERS) sensor based on ZrO 2 @TiO 2 /Ag substrate for the analysis of pesticide residues. The synergetic effects of the metal organic framework (MOF)‐derived porous ZrO 2 @TiO 2 heterostructure induced charge transfer enhancement and the electromagnetic enhancement from the plasmonic silver nanoparticles (AgNPs) hotspot generate significant SERS enhancement signal. The SERS substrate exhibits superior long‐term stability and signal homogeneity for SERS quantitative analysis. The platform has the capability to detect not only model molecule of 4‐ATP but also pesticides of triazophos and fonofos at the extremely low concentration of 10 −8 M. Moreover, we simulate the quantitative detection of pesticide residue on real objects by spraying pesticides on dendrobium and chrysanthemum leaves, followed by transferring to the SERS platform to perform analysis. The nearly linear fitting curve with a wide concentration range suggests the superior qualitative detection capability. Remarkably, two components and three components of the pesticides are readily identified in a rapid way. The approach provides the rapid analysis, low‐cost device, and portable and quantitative pesticide identification and offers a clear path to multicomponent analysis at a trace level.
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