分子印迹
材料科学
分子印迹聚合物
拉曼散射
聚合物
纳米技术
纳米颗粒
选择性
拉曼光谱
银纳米粒子
检出限
化学
色谱法
催化作用
光学
有机化学
物理
复合材料
作者
Xiaohui Ren,Ling Yang,Yuanchao Li,Xin Li
标识
DOI:10.1016/j.apsusc.2020.148879
摘要
The combination of surface-enhanced Raman scattering (SERS) with molecular imprinting technology has shown great potential in bioanalysis, medical delivery, and environmental monitoring. However remain, and leakage of imprinting molecule limits detection reliability and sensitivity. Herein, the first time presents an effective strategy to solve this issue. In this case, TiO2 nanoparticles are employed here to in situ grow on silver microspheres, forming a plasmonic structure. A sandwiched silver microsphere/TiO2 nanoparticles/molecular imprinted polymers (Ag-TiO2@MIPs) has obtained by a surface molecular imprinting approach. Remarkably, the unique Ag-TiO2 plasmonic structures not offer efficient Raman enhancement but also possess excellent photocatalytic activity. By taking advantage of self-cleaning characteristics, the residual template within MIPs matrix can be decomposed by photocatalytic degradation, thereby suppressing interference of background noise and enhancing detection selectivity. Besides, Ag-TiO2@MIPs with high sensitivity and selectivity in sulfamethazine detection has been demonstrating. The density functional theory calculations have been performed to choose optimal functional monomers and predict Raman spectra of sulfamethazine. Finally, proposed Ag-TiO2@MIPs for detection of sulfamethazine with good selectivity and recyclability. The minimum detection concentration of sulfamethazine was as low as 3.6 × 10-9 mol L-1. Our study points a way for improving the reliability and sensitivity of SERS detection for future practical applications.
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