Journal
SENSORS
Volume 14, Issue 10, Pages 18701-18710Publisher
MDPI
DOI: 10.3390/s141018701
Keywords
localized surface plasmon resonance; photodeposition; fiber optic sensor; refractive index; silver nanoparticles
Funding
- CONACyT [206740]
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This paper reports the implementation of an optical fiber sensor to measure the refractive index in aqueous media based on localized surface plasmon resonance (LSPR). We have used a novel technique known as photodeposition to immobilize silver nanoparticles on the optical fiber end. This technique has a simple instrumentation, involves laser light via an optical fiber and silver nanoparticles suspended in an aqueous medium. The optical sensor was assembled using a tungsten lamp as white light, a spectrometer, and an optical fiber with silver nanoparticles. The response of this sensor is such that the LSPR peak wavelength is linearly shifted to longer wavelengths as the refractive index is increased, showing a sensitivity of 67.6 nm/RIU. Experimental results are presented.
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