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Combination of fluorescence spectroscopy and electrochemical technique as a novel and sensitive electro-optical detection system for gaseous and dissolved oxygen detection using nitrogen-doped quantum dots through the amperomric reduction of oxygen

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Abstract A novel dissolved and gaseous oxygen electro-optical sensor was fabricated based on the dependency of the fluorescence intensity of a synthesized nitrogen-doped carbon nanodots (N-CDots) during the amperometric reduction… Click to show full abstract

Abstract A novel dissolved and gaseous oxygen electro-optical sensor was fabricated based on the dependency of the fluorescence intensity of a synthesized nitrogen-doped carbon nanodots (N-CDots) during the amperometric reduction of O2 at potential of − 0.55 V (vs. Ag/AgCl) for about 20 s using a three-electrode system including gold rod as worker electrode, platinum rod as counter electrode and Ag/AgCl (3.0 mol L− 1 Cl−) as reference electrode, followed by measuring the fluorescence intensity at excitation wavelength of 350 nm. Under optimized condition, i.e. 5.0 μg mL− 1 of N-CDots, ionic strength of 0.5 mol L− 1 and room temperature, the linear range for the dissolved oxygen was estimated to between 0.11 and 22 μg mL− 1 with detection limit of 0.07 μg mL− 1 (n = 4). For gaseous oxygen the linear dynamic range was between 3.0 and 48.0% with the limit of detection of 0.95% (n = 4). The response time (t90) of the sensor was estimated to be 20 s. No interfering effect was observed during analysis of at least 200-fold excess (vs. 2.0 μg mL− 1 dissolved oxygen) of organic and inorganic species such as, K2SO4, KNO3, MgCl2, MnCl2, NaClO4, NaF, NH4Cl, CaCl2 and Na3PO4, except NO2− and HCO3− which interfered for respectively 12-fold and 75-fold excess. The reliability of the method was also evaluated via analyses of waste and industrial samples.

Keywords: oxygen; detection; fluorescence; electro optical; spectroscopy; dissolved oxygen

Journal Title: Journal of Electroanalytical Chemistry
Year Published: 2017

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