4.7 Article

Localised plasmonic hybridisation mode optical fibre sensing of relative humidity

期刊

SENSORS AND ACTUATORS B-CHEMICAL
卷 353, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.131157

关键词

Optical fibre sensor; LSPR; Plasmonic hybridisation; Humidity sensor

资金

  1. Development Pathway Funding Scheme of The Medical Research Council (UK) [MR/R025266/1]
  2. Royal Society Industry Fellowship

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This work presents a functionalized optical fibre probe with 'cotton-shaped' gold-silica nanostructures for monitoring relative humidity (RH). The sensor utilizes the localized surface plasmon resonance (LSPR) of self-assembled nanostructures and demonstrates a high sensitivity to RH after optimization. The plasmonic hybridization mode sensor exhibited excellent linearity, reversibility, and fast response and recovery times.
This work reports an optical fibre probe functionalised with 'cotton-shaped' gold-silica nanostructures for relative humidity (RH) monitoring. The sensor response utilises the localised surface plasmon resonance (LSPR) of self-assembled nanostructures: gold nanospheres (40 nm) surrounded by one layer of poly (allylamine hydrochloride) and hydrophilic silica nanoparticles (10-20 nm) on the end-facet of an optical fibre via a wavelength shift of the reflected light. Sensor optimisation is investigated by varying the density of gold nanoparticles on the end-facet of an optical fibre. It is demonstrated that the plasmonic hybridisation mode appearing when the average gold interparticle distance is small (Median: 7.5 nm) is more sensitive to RH after functionalisation than the singular plasmonic mode. The plasmonic hybridisation mode sensor demonstrates a high linear regression to RH with a sensitivity of 0.63 nm/%RH and excellent reversibility. The response time (T10-90%) and recovery time (T90-10%) are calculated as 1.2 +/- 0.4 s and 0.95 +/- 0.18 s. The sensor shows no measurable cross-talk to temperature in the tested range between 25 degrees C to 40 degrees C and the 95% limit of agreement is 3.1%RH when compared to a commercial reference sensor. Simulation with finite element analysis reveals a polarisation-dependent plasmonic hybridisation with a redshift of plasmonic wavelength as a decrease of the interparticle distance and a higher refractive index sensitivity, which results in a high sensitivity to RH as observed in the experiment.

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