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Updated: Mar 9, 2026

Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations
Published on: June 23, 2022
A ratiometric nanoarchitecture for the simultaneous detection of pH and halide ions using UV plasmon-enhanced
Jérémie Asselin1, Marie-Pier Lambert1, Nicolas Fontaine1
1Département de Chimie et Centre d'optique Photonique et Laser (COPL), Université Laval, Québec (QC) G1V 0A6, Canada. denis.boudreau@chm.ulaval.ca.
Abstract:
In this work, we designed a ratiometric core-shell nanoarchitecture composed of an indium UV plasmonic core, an internal reference (rhodamine B), a pH-sensitive probe (fluorescein), and a halide ion sensor (6-methoxyquinolinium). Immobilizing the fluorophores in distinct silica layers at precise distances from the core modulates the plasmon coupling and tunes the linear concentration range of halide ion detection.

