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Microfluidic Platform for Integrated Plasmonic Detection in Laminal Flow
摘要： In this work, we propose a novel approach to design robust microfluidic devices with integrated plasmonic nanoparticles. A strong electric field generated in the gaps between AuBPs – due to the generation of the so-called extrinsic ‘hot-spots’ – was subsequently proved by the volumetric SERS detection of molecules in continuous flow conditions by loading the analyte into the microfluidic channel via a syringe pump. In conclusion, our miniaturized portable microfluidic system aims to detect and identify in real-time with high accuracy analyte molecules in laminal flow, providing thus a groundwork for further complex biosensing applications.
关键词： Gold Bipyramids,Detection in Laminal Flow,LSPR,Microfluidic Chip,SERS
更新于2025-09-23 15:21:01
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Plasmonic Oligomers with Tunable Conductive Nanojunctions
摘要： Engineering plasmonic hot-spots is essential for applications of plasmonic nanoparticles. A particularly appealing route is to weld plasmonic nanoparticles together to form more complex structures sustaining plasmons with symmetries targeted to given applications. However, the control of the welding and subsequent hotspot characteristic is still challenging. Herein, we demonstrate an original method that connects gold particles to their neighbors by another metal of choice. We first assemble gold bipyramids in a tip-to-tip configuration, yielding short chains of variable length and grow metallic junctions in a second step. We follow the chain formation and the deposition of the second metal (i.e. silver or palladium) via UV/Vis spectroscopy and we map the plasmonic properties using electron energy loss spectroscopy. The formation of silver bridges leads to a huge redshift of the longitudinal plasmon modes into the mid-infrared region, while the addition of palladium results in a redshift accompanied by significant plasmon damping.
关键词： UV/Vis spectroscopy,Tunable conductive nanojunctions,Palladium,Plasmonic oligomers,Gold bipyramids,Electron Energy Loss Spectroscopy,Silver bridges
更新于2025-09-12 10:27:22