Luminescent Eu(III) hybrid sensors for in situ copper detection

In this work we used the sol–gel technique to develop luminescent Eu(III) transparent films deposited on glass slides to build for sensor devices capable of monitoring transition metal ions in aqueous solutions. The films were obtained from a bis(trialkoxysilyl) organic precursor synthesized from th...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2011-11, Vol.158 (1), p.214-222
Main Authors: Barja, Beatriz C., Bari, Sara E., Marchi, M. Claudia, Iglesias, Fabricio L., Bernardi, Milagros
Format: Article
Language:English
Subjects:
aqueous solutions
cobalt
Constants
Construction
copper
Crosslinking
Cu(II) sensor
Deposition
Devices
Europium(III)
Glass
Hybrid materials
ions
iron
luminescence
Luminescence quenching
metal ions
monitoring
nickel
Sensors
Sol gel process
Sol–gel
surfactants
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Summary:In this work we used the sol–gel technique to develop luminescent Eu(III) transparent films deposited on glass slides to build for sensor devices capable of monitoring transition metal ions in aqueous solutions. The films were obtained from a bis(trialkoxysilyl) organic precursor synthesized from the amide of the 2,6-pyridinedicarboxylic acid (DPA) with aminopropyltriethoxysilane (APTES) in the presence or absence of cetyl trimethyl ammonium bromide (CTAB) surfactant as templating agent and triethylethoxysilane (TEOS) as crosslinker. These sensor devices were used to perform in situ quenching experiments by Cu(II), Fe(III), Co(II) and Ni(II) ions. The results indicate that the templated films allow the detection and quantification of these metals down to ppb levels by means of the values of the Stern–Volmer constants. In particular, it was shown that Cu(II) acts as an extremely efficient quencher ( K SV = 3.5 × 10 5 M −1) when compared with the results obtained for the other metals, opening the possibility to use these devices as potential Cu(II) sensors for actual applications in aqueous media.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2011.06.006