A Flexible Chemosensor Based on Colorimetric and Fluorescent Dual Modes for Rapid and Sensitive Detection of Hypochlorite Anion

Abstract

A flexible chemosensor has been developed based on colorimetric and fluorescent dual modes using tetraphenylethylene-centered tetraaniline (TPE4A) for rapid and sensitive detection of hypochlorite anion. The fluorescent probe TPE4A exhibits a unique aggregation-induced emission (AIE) character which is proved by a blue shift of the fluorescent peak from 544 to 474 nm with the water equivalents increasing. With the addition of hypochlorite in solution, the absorbance of the probe changes and the responding fluorescence color can be observed to change from light green to purple. The detection limit of hypochlorite is 1.80 × 10−4 M in solution, and the visual detection limit is 1.27 µg/cm2 with the naked eye for the flexible paper-based chemosensor. The proposed flexible chemosensors show a good selectivity and sensitivity which has great potential for effective detection of hypochlorite anions without any spectroscopic instrumentation.

Pyrene‐based ratiometric fluorescent chemosensor for sensitive detection of hypochlorite in a perfect aqueous solution

“…Many analysis methods have been developed to detect ClO À , such as colorimetry, fluorescence, electrophoresis, and electrochemical analysis [13][14][15][16][17][18]. Especially, fluorescence analysis is in the spotlight because of its short response time, high sensitivity, convenience, and low cost [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. Among fluorescence analyses, ratiometric fluorescence analysis is most attractive because it uses the ratio between two emission intensities to measure analyte levels, providing built-in corrections for environmental influences and stability [34][35][36][37][38].…”