Abstract
Hypochlorite (ClO−) exposure has been confirmed to be associated with many serious diseases. Although abundant organic molecule-based probes have demonstrated high sensitivity and selectivity for ClO− response, they often suffer from limitations including tedious preparation steps, poor water solubility, and the use of toxic solvent. In this work, a novel fluorescent sensor based on carbon spheres (CS) synthesized by solvothermal method was presented for ClO− detection. In the presence of ClO−, the obtained micro-size CS that initially displayed very weak fluorescence experienced a significant fluorescence enhancement in the blue channel, and a linear response range of 2–110 μM with detection limit of 10.7 nM could be achieved. In addition to proposed mechanism verification, a field visualization platform based on smartphone was designed to monitor hypochlorite in real environmental water samples to demonstrate its potential in portable detection.
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