Abstract
Herein, a convenient on-off fluorescent probe was developed to detect iron ion (Fe3+) with sensitivity and selectivity by using highly luminescent ionic liquid-functionalized carbon quantum dots (CQDs) which was prepared by one-step hydrothermal treatment using citric acid and 1-Aminopropyl-3-methylimidazolium. The sensitivity of CQDs for Fe3+ was examined by measuring the fluorescence (FL) intensity of various concentrations of Fe3+ in CQDs solution and the selectivity of CQDs for Fe3+ was examined by adding different metal ions (Na+, Mg2+, Al3+, K+, Ca2+, Mn2+, Zn2+, Ag+, Cd2+, Pb2+ and Ba2+) into CQDs solution, respectively. The results indicated that the FL intensity of CQDs showed a good linear response to the concentrations of Fe3+ in the range of 0–300μmolL−1 (R2=0.99) with a detection limit of 13.68μmolL−1. Furthermore, based on the redox mechanism, after the fluorescent of CQDs was quenched by Fe3+, different neurotransmitters and amino acids were added and the FL test show that only ascorbic acid (AA) can recover the intensity of the CQDs/Fe3+, indicating that CQDs/Fe3+ can be further used as a on-off fluorescent probe for the detection of AA. It is expected that our strategy may offer a new approach for developing rapid, low cost and sensitive CQDs-based sensors for environmetal and biological sensing applications.
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