A Lossy Mode Resonance optical sensor using silver nanoparticles-loaded films for monitoring human breathing

This work is focused on the fabrication of a human breathing sensor based on the in situ synthesis of silver nanoparticles (Ag-NPs) inside a polymeric coating previously deposited on an optical fiber core by means of the Layer-by-Layer self-assembly. The Ag-NPs were created using a synthesis protoco...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2013-10, Vol.187, p.40-44
Main Authors: Rivero, Pedro J., Urrutia, A., Goicoechea, J., Matias, I.R., Arregui, F.J.
Format: Article
Language:English
Subjects:
atomic force microscopy
Breathing
cations
Coating
coatings
dimethylamine
energy
energy-dispersive X-ray analysis
Human
humans
Humidity sensing
Lossy Mode Resonances (LMR)
monitoring
nanosilver
Reduction
refractive index
Self assembly
Sensors
Silver
Silver nanoparticles (Ag-NPs)
spectroscopy
Synthesis
X-radiation
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Summary:This work is focused on the fabrication of a human breathing sensor based on the in situ synthesis of silver nanoparticles (Ag-NPs) inside a polymeric coating previously deposited on an optical fiber core by means of the Layer-by-Layer self-assembly. The Ag-NPs were created using a synthesis protocol consisting of a loading step of the Ag+ cations into the polymeric film and a further reduction step using dimethylamine borane (DMAB). The morphology and distribution of the Ag-NPs inside the polymeric coating have been studied using atomic force microscopy (AFM). Furthermore, UV–VIS spectroscopy and energy dispersive X-ray (EDX) were also used to confirm the synthesis of the Ag-NPs within the resultant coating. The amount of Ag-NPs increases when the number of loading/reduction cycles is higher. Therefore the incorporation of the Ag-NPs affects the refractive index of the overlay promoting the observation of a resonant attenuation band in the infrared region (NIR), known as Lossy Mode Resonance (LMR), which can be used as a sensing signal to monitor the human breathing. The quality of the device has been experimentally tested with good sensitivity (0.455nm per RH%) and fast response time (692ms and 839ms for rise/fall).
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2012.09.022