Efficient Enrichment and Self-Assembly of Hybrid Nanoparticles into Removable and Magnetic SERS Substrates for Sensitive Detection of Environmental Pollutants

作者：Siying Tang, Yong Li, Hao Huang, Penghui Li, Zhinan Guo, Qian Luo, Zhe Wang, Paul K. Chu, Jia Li, Xue‐Feng Yu · 发表于：ACS Applied Materials & Interfaces · 年份：2017 · DOI：10.1021/acsami.6b16141 · 被引用次数：101 · 研究领域：Gold and Silver Nanoparticles Synthesis and Applications、Biosensors and Analytical Detection、Nanomaterials and Printing Technologies

A structure consisting of a low surface energy substrate and low surface tension liquid is designed and prepared by taking advantage of perfluorinated fluid infusion into the porous Teflon membrane. This slippery platform allows efficient enrichment and self-assembly of hybrid nanoparticles and the assembled structure can be detached from the membrane. A macroscale superlattice array of Au nanorods doped with magnetic Fe 3 O 4 nanoparticles is obtained by suppressing the outward capillary flow and coffee-ring effect during evaporative self-assembly. In SERS (surface enhanced Raman scattering) detection of environmental pollutants including thiram, diquat and polycyclic aromatic hydrocarbons, the removable plasmonic superlattice array with magnetic properties enables rapid separation of analytes from the solution resulting in excellent sensitivity and detection limits down to the nanomolar level. The self-assembly strategy shows great potential in the fabrication of removable 3D plasmonic superlattice arrays for SERS detections.