Surface plasmon resonance sensor based on golden nanoparticles and cold vapour generation technique for the detection of mercury in aqueous samples

•Hg+2 sensor in water solutions base in god nanoparticles was developed.•SPR calculations based in Mie theory were done to explain the observed effect.•The sensor is selective and with high sensitivity.•The sensor could be used in field. In this work, a surface plasmon resonance sensor for determina...

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Bibliographic Details
Published in:Optics and laser technology 2017-09, Vol.94, p.34-39
Main Authors: Castillo, Jimmy, Chirinos, José, Gutiérrez, Héctor, La Cruz, Marie
Format: Article
Language:English
Subjects:
Drinking water
Fluorescence
Gold
Gold nanoparticle
Mercury
Mercury (metal)
Mercury sensor
Mie scattering
Nanoparticles
Sensors
Surface plasmon resonance
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Summary:•Hg+2 sensor in water solutions base in god nanoparticles was developed.•SPR calculations based in Mie theory were done to explain the observed effect.•The sensor is selective and with high sensitivity.•The sensor could be used in field. In this work, a surface plasmon resonance sensor for determination of Hg based on golden nanoparticles was developed. The sensor follows the change of the signal from solutions in contact with atomic mercury previously generated by the reaction with sodium borohydride. Mie theory predicts that Hg film, as low as 5nm, induced a significant reduction of the surface plasmon resonance signal of 40nm golden nanoparticles. This property was used for quantification purposes in the sensor. The device provide limits of detection of 172ng/L that can compared with the 91ng/L obtained with atomic fluorescence, a common technique used for Hg quantification in drinking water. This result was relevant, considering that it was not necessary to functionalize the nanoparticles or use nanoparticles deposited in a substrate. Also, thanks that Hg is released from the matrix, the surface plasmon resonance signal was not affected by concomitant elements in the sample.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2017.03.013