4.5 Article

Self-Referenced Optical Fiber Sensor Based on LSPR Generated by Gold and Silver Nanoparticles Embedded in Layer-by-Layer Nanostructured Coatings

期刊

CHEMOSENSORS
卷 10, 期 2, 页码 -

出版社

MDPI
DOI: 10.3390/chemosensors10020077

关键词

fiber optic sensor; gold nanoparticles; silver nanoparticles; localized surface plasmon resonance; Layer-by-Layer Embedding; mercury; hydrogen peroxide

资金

  1. Spanish Agencia Estatal de Investigacion (AEI) [PID2019-106070RB-I00]

向作者/读者索取更多资源

An optical fiber sensor based on the localized surface plasmon resonance phenomenon has been designed for the detection of two different chemical species (mercury and hydrogen peroxide) using Layer-by-Layer Embedding as a nanofabrication technique. Silver nanoparticles and gold nanoparticles have been synthesized and incorporated into nanometric thin films. The spectral response of the sensor provides a stable real-time reference measurement.
In this work, an optical fiber sensor based on the localized surface plasmon resonance (LSPR) phenomenon has been designed for the detection of two different chemical species (mercury and hydrogen peroxide) by using Layer-by-Layer Embedding (LbL-E) as a nanofabrication technique. In the first step, silver nanoparticles (AgNPs) and gold nanoparticles (AuNPs) have been synthesized by using a chemical protocol as a function of the strict control of three main parameters, which were polyelectrolyte concentration, a loading agent, and a reducing agent. In the second step, their incorporation into nanometric thin films have been demonstrated as a function of the number of bilayers, which shows two well-located absorption peaks associated to their LSPR in the visible region at 420 nm (AgNPs) and 530 nm (AuNPs). Finally, both plasmonic peaks provide a stable real-time reference measurement, which can be extracted from the spectral response of the optical fiber sensor, which shows a specific sensing mechanism as a function of the analyte of study.

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