Abstract

This paper develops a new ratiometric optical dual sensor for ${\mathrm{Cu}}^{2+}$ ions and dissolved oxygen (DO) incorporating a sol–gel matrix doped with palladium tetrakis pentafluorophenyl porphine as the oxygen-sensitive material, CdSe quantum dots as the ${\mathrm{Cu}}^{2+}$ ion-sensing material, and 7-amino-4-trifluoromethyl coumarin as the ${\mathrm{Cu}}^{2+}/\mathrm{DO}$ practically independent fluorescent dye. The feasibility of coating an optical fiber with the sensing film to fabricate a ratiometric optical fiber dual sensor is investigated. Using an LED with a central wavelength of 405 nm as an excitation source, it is shown that the emission wavelengths of the ${\mathrm{Cu}}^{2+}$ ion-sensitive, DO-sensitive dye and the reference dye have no spectral overlap and therefore permit ${\mathrm{Cu}}^{2+}$ ion and DO concentration to be measured using a ratiometric-based method. The ratiometric optical fiber dual sensor has been tested with regard to monitoring different ${\mathrm{Cu}}^{2+}$ ion (0–10 μM) and DO concentrations (0–38 mg/L). The results show that the luminescence properties of the ${\mathrm{Cu}}^{2+}$ ion sensor are independent of the presence of the oxygen sensor and have a uniquely good linear response in the 0–10 μM range. The proposed ratiometric sensing approach presented in this study has the advantage of suppressing spurious fluctuations in the intensity of the excitation source.

© 2015 Optical Society of America

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