Abstract
Despite widely reported fluorescence sensors for cations, direct detection of anions is nevertheless still rare. In this work, ionic liquid-functionalized fluorescent carbon nanoribbons (IL-CNRs) are one-step synthesized and serve as the fluorescent probes for direct and sensitive detection of sulfide ions (S2−). The IL-CNRs are synthesized based on electrochemical exfoliation of graphite rods in a water-IL biphasic system. The as-prepared IL-CNRs exhibit uniform structure, high crystallinity, strong blue fluorescence (absolute photoluminescence quantum yield of 11.4%), and unique selectivity towards S2−. Based on the fluorescence quenching of IL-CNRs by S2−, a fluorescence sensor is developed for direct, rapid and sensitive detection of S2− in the range of 100 nM to 1 μM and 1–300 μM with a low detection limit (LOD, 85 nM). Moreover, detection of S2− in a real sample (tap water) is also demonstrated.
Highlights
Inorganic anions play a crucial role in industrial, biological and environmental elds.[1]
Based on the same off–on strategies, graphitic carbon nitride quantum dots-Hg2+,7 nitrogen and sulfur co-doped carbon dots (CDs)-Hg2+,6 CDs-gold nanoparticles,[10] silver nanoparticles capped with CDs,[9] CDs-MnO2 nanosheets,[13] quinoline-Zn2+,2 calix[4]arene-Cu2+,11 and organic semiconductor polymer nanodots-Cu2+ systems[8] were applied for the detection of S2À ions
Electrochemical synthesis has attracted attention owning to the inexpensive apparatus and easy operation under
Summary
Inorganic anions play a crucial role in industrial, biological and environmental elds.[1]. Based on the same off–on strategies, graphitic carbon nitride quantum dots-Hg2+,7 nitrogen and sulfur co-doped carbon dots (CDs)-Hg2+,6 CDs-gold nanoparticles,[10] silver nanoparticles capped with CDs,[9] CDs-MnO2 nanosheets,[13] quinoline-Zn2+,2 calix[4]arene-Cu2+,11 and organic semiconductor polymer nanodots-Cu2+ systems[8] were applied for the detection of S2À ions. It still remains great challenge for improving the chemical selectivity of uorescent probe to realize the direct detection of S2À. In comparison with the previous cation-based uorescent sensor, we for the rst time demonstrate the application of IL-CNRs for direct and selective detection of S2À
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