Journal
MICROCHIMICA ACTA
Volume 187, Issue 1, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-4002-8
Keywords
Pesticide sensor; Fenitrothion; Plasmonics; Optical fiber sensor; Refractive index; Ta2O5 nanoparticles; Reduced graphene oxide
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Funding
- Council of Scientific and Industrial Research (CSIR), New Delhi [09/086(1205)/2014-EMR-I]
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A surface plasmon resonance study was carried out for the identification and determination of the organophosphate pesticide fenitrothion via an optical fiber sensor. A thin layer of silver was deposited on the unclad core of silica optical fiber for plasmon generation. This was followed by the deposition of a sensing surface comprising a layer of tantalum(V) oxide nanoparticles sequestered in a nano-scaled matrix of reduced graphene oxide. The sensing mechanism is due to the interaction of fenitrothion with the silver film which leads to a change in refractive index.. Characterized by a wavelength interrogation scheme, the fiberoptic sensor exhibited a red shift equalling 56 nm corresponding to fenitrothion concentration in the range 0.25-4 mu M including the blank solution. The spectral sensitivity is 24 nm mu M-1, the limit of detection is 38 nM, and the response time is as short as 23 s. The sensor is selective, repeatable and works at ambient temperature.
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