Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 209, Issue -, Pages 94-99Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.11.084
Keywords
Optical fiber; Dual sensing; Dissolved oxygen; Cu2+ ions; PdTFPP; CdSe
Funding
- National Science Council of Taiwan [NSC101-2221-E-131-012]
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A simple, low-cost technique for fabricating a plastic optical fiber sensor for the dual sensing of dissolvedoxygen (DO) and Cu2+ ions is proposed. The optical fiber dual sensor consists of quantum dots (QDs) and oxygen indicator coated on the fiber end. A fluorinated xerogel doped with palladium (II) mesotetrakis(pentafluorophenyl) porphyrin (PdTFPP) and CdSe QDs serves as the DO and Cu2+ ion sensing material. The Cu2+ ion and DO fluorescent indicators can both be excited with a 405-nm LED and the two emission wavelengths can be detected separately. The optical fiber dual sensor was tested with regard to monitoring various Cu2+ ion and DO concentrations. The attenuation of the relative luminescence intensity for Cu2+ ion sensing has a linear relationship with Cu2+ ions in the tested range. In addition, the results show that the luminescence properties of the Cu2+ ion sensor are independent of the presence of the DO sensor, and have a uniquely good linear response in the 0-10 mu M range. The proposed optical fiber dual sensor can be used for the simultaneously sensing of Cu2+ ion and DO concentrations in biological, medical, and environmental applications. (C) 2014 Elsevier B.V. All rights reserved.
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