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Sensors 2014, 14(3), 4657-4671; doi:10.3390/s140304657

A Simple Small Size and Low Cost Sensor Based on Surface Plasmon Resonance for Selective Detection of Fe(III)

1
Department of Industrial and Information Engineering, Second University of Naples, Via Roma 29, Aversa 81031, Italy
2
Department of Chemistry, University of Pavia, Via Taramelli 12, Pavia 27100, Italy
*
Author to whom correspondence should be addressed.
Received: 16 January 2014 / Revised: 28 February 2014 / Accepted: 4 March 2014 / Published: 7 March 2014
(This article belongs to the Special Issue Plasmonics and Nanoplasmonics Biosensors)
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Abstract

A simple, small size, and low cost sensor based on a Deferoxamine Self Assembled Monolayer (DFO-SAM) and Surface Plasmon Resonance (SPR) transduction, in connection with a Plastic Optical Fiber (POF), has been developed for the selective detection of Fe(III). DFO-SAM sensors based on appropriate electrochemical techniques can be frequently found in the scientific literature. In this work, we present the first example of a DFO-SAM sensor based on SPR in an optical fiber. The SPR sensing platform was realized by removing the cladding of a plastic optical fiber along half the circumference, spin coating a buffer of Microposit S1813 photoresist on the exposed core, and finally sputtering a thin gold film. The hydroxamate siderophore deferoxamine (DFO), having high binding affinity for Fe(III), is then used in its immobilized form, as self-assembled monolayer on the gold layer surface of the POF sensor. The results showed that the DFO-SAM-POF-sensor was able to sense the formation of the Fe(III)/DFO complex in the range of concentrations between 1 μm and 50 μm with a linearity range from 0 to 30 μm of Fe(III). The selectivity of the sensor was also proved by interference tests. View Full-Text
Keywords: plastic optical fiber; surface plasmon resonance; deferoxamine; self-assembled monolayer; iron(III) plastic optical fiber; surface plasmon resonance; deferoxamine; self-assembled monolayer; iron(III)
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Cennamo, N.; Alberti, G.; Pesavento, M.; D'Agostino, G.; Quattrini, F.; Biesuz, R.; Zeni, L. A Simple Small Size and Low Cost Sensor Based on Surface Plasmon Resonance for Selective Detection of Fe(III). Sensors 2014, 14, 4657-4671.

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