Abstract
A stable, compact and portable fibre optic sensing system which is capable of real time detection of Zn2+ in dilute aqueous media has been reported. The sensor exhibited a significant increase in fluorescence intensity in response to Zn2+ in the low micromolar concentration range via a photoinduced electron transfer (PET) mechanism in a covalently incorporated coumarin dipicolylamine dye. A referencing scheme allowing for corrections due to fluctuations of the excitation light and transmission properties of the optical fibre or environmental perturbation to the sensor system has been introduced using a highly stable perylene red based material as the internal reference. Once its performance is further refined, this type of sensor has the potential to be an important tool for environmental monitoring.
© 2018 The Author(s)
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