Rapid Detection of Sodium Hexametaphosphate by Visualization of Ratiometric Fluorescent Probes Based on Carbon Dots and Copper Nanoclusters
DOI:
https://doi.org/10.54097/ajst.v8i1.13565Keywords:
Sodium hexametaphosphate; Copper nanoclusters; Carbon point; Ratio fluorescence; Aggregation induced luminescence; Smartphone app.Abstract
A method for ratiometric fluorescence detection of sodium hexametaphosphate based on carbon dots and copper nanoclusters was established. In this probe, aggregation-induced emission (AIEE) between Al3+ and CuNCs resulted in fluorescence enhancement accompanied by carbon dot fluorescence burst. When sodium hexametaphosphate was added, Al3+ was coordinated with sodium hexametaphosphate to release Al3+ from the surface of Cu nanoclusters to achieve Cu nanocluster fluorescence burst. The different response of the dual emission to sodium hexametaphosphate leads to a change in fluorescence color, which makes macroscopic visualization easy. With a smartphone, the fluorescence color change can be observed more clearly than with a single fluorescent nanoprobe, and the response is linearly increasing, so the nanoprobe can be applied for rapid measurements. In addition, the dual-emission nanoprobe was successfully used for beverage analysis. Accurate concentrations were obtained by constructing calibration maps using a fluorescence spectrometer and a smartphone app; recoveries ranged from 97.5% to 102.5% with a relative standard deviation of less than 3.1%. Thus, this dual-emission detection system integrated with a smartphone holds promise as a new portable method for on-site measurement of sodium hexametaphosphate.
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