Fiber-Optic Evanescent-Wave Absorption Copper(II) Sensor Based on Sol-Gel-Derived Organofunctionalized Silica Cladding

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Abstract:

A fiber-optic evanescent-wave absorption sensor was constructed on the basis of an organofunctionalized silica cladding. The cladding material was prepared by the sol-gel processing of an organofunctional silicon alkoxide, which contains a propyl-ethylenediamine triacetate (PEDTA) group. The PEDTA group can chelate with a Cu(II) ion to form a colored complex. Because of the large formation constant of the complexation reaction, a kinetic approach was used to quantify the Cu(II) content in samples. The sensor has a dynamic range of 0.5–100 ppm and a detection limit of 56 ppb. The measurement of the Cu(II) content in a scattering medium has also been demonstrated.

Keywords: COPPER II SENSOR; EVANESCENT-WAVE SENSOR; FIBER-OPTIC SENSOR; SOL-GEL CLADDING

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702011953676

Publication date: October 1, 2001

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