Abstract
Three different nanosensors with core-shell structures were fabricated by molecular self-assembly and evaporation techniques. Such closely packed nanoparticles exhibit fine optical properties which are useful for biochemical sensing. The refractive index sensitivity (RIS) of nanosensors was detected by varying the refractive index of the surrounding medium and the decay length of nanosensors was investigated using a layer-by-layer polyelectrolyte multilayer assembly. The results showed that the thickness of the Au shell plays an important role in determining the RIS and the decay length. A system based on localized surface plasmon resonances (LSPR) sensing was constructed in our study. The core-shell nanosensors can detect 10 ng/mL atrazine solutions and are suitable for pesticide residue detection.
Highlights
Noble nanoparticles such as gold and silver have attracted much attention both in the biosensor and disease diagnosis fields during recent years due to their unique optical properties [1,2,3]
There are two key points in the process of producing the sensors: (1) the concentration of the PS must be appropriate in the spin-coating step, otherwise the PS will clump or distribute loosely and not be able to form a uniform large-area monolayer; (2) the slide dipping into the water must be extremely slow, because the connection strength between PS particles is very weak
We have presented a systematic study of the fabrication and the localized surface plasmon resonances (LSPR) sensing performance of some new nanosensors
Summary
Noble nanoparticles such as gold and silver have attracted much attention both in the biosensor and disease diagnosis fields during recent years due to their unique optical properties [1,2,3]. The size of PS spheres can be efficiently reduced with plasma etching, and the surface topography can be manipulated by controlling the initial PS sphere size and the time of plasma exposure These non-close-packed LSPR sensors have great advantages of tunable size and interparticle distances of the PS spheres, which can lead to different LSPR resonant peaks and can be suitable for special sensing applications such as surface wettability or hydrophobicity. Researchers found a strong enhancement of the magneto-optical Faraday rotation in all-metal core-shell Co-Ag nanoparticles attributed to localized surface plasmon resonance, which may enable the design of nanostructures for modulated sensing, imaging of magnetic fields and miniaturized magneto-optical devices, but compared to Au-shell structures, Ag-shell ones are oxidised and unstable. We provide an overall and reasonable idea to evaluate the sensing capability in a LSPR sensing procedure
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