Institute of Biomedicine and Biotechnology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences , Shenzhen 518055, P. R. China.
Department of Physics and Materials Science, City University of Hong Kong , Tat Chee Avenue, Kowloon, Hong Kong, P.R. China.
ACS Appl Mater Interfaces. 2017 Mar 1;9(8):7472-7480. doi: 10.1021/acsami.6b16141. Epub 2017 Feb 15.
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 FeO 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.
设计并制备了一种由低表面能基底和低表面张力液体组成的结构，利用全氟流体注入多孔聚四氟乙烯膜来实现。这种光滑平台允许高效富集和混合纳米粒子的自组装，并且组装结构可以从膜上脱离。通过抑制蒸发自组装过程中的向外毛细流动和咖啡环效应，得到了掺杂磁性 FeO 纳米粒子的 Au 纳米棒的宏观超晶格阵列。在包括福美双、百草枯和多环芳烃在内的环境污染物的 SERS（表面增强拉曼散射）检测中，具有磁性的可移动等离子体超晶格阵列能够实现分析物从溶液中的快速分离，从而具有出色的灵敏度和检测限，可达纳摩尔级。自组装策略在用于 SERS 检测的可移动 3D 等离子体超晶格阵列的制造方面具有巨大的潜力。
