Particle size distribution and Au concentration dependence of the refractive-index sensitivity of LSPR sensors based on gold nanoparticles
Source abstract
Abstract
In this study, we investigated the effect of particle size distribution on the performance of gold nanoparticles (GNPs)-based localized surface plasmon resonance (LSPR) sensor developed for measuring the refractive indices of solvents. GNPs with different size distributions were synthesized using a microfluidic device by tuning the gold precursor flow rate, and an LSPR sensor was fabricated by fixing the synthesized GNPs on a glass substrate. The peak wavelengths in the absorption spectra recorded in various solvents with different refractive indices confirmed that the sensitivity of the GNPs-based LSPR sensor depends on the coefficient of variation of the nanoparticles. An LSPR sensor based on monodisperse GNPs with a coefficient of variation of 0.11 exhibits higher sensitivity (77 nm/RIU) than that based on GNPs synthesized by a batch process with three times the Au concentration and a coefficient of variation of 0.27. The results suggest that highly sensitive LSPR sensors can be fabricated using GNPs with low coefficients of variation and even low Au concentrations.
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Research context
OpenAlex topics: Gold and Silver Nanoparticles Synthesis and Applications · Plasmonic and Surface Plasmon Research · Biosensors and Analytical Detection
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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