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A solid fluorescence sensor composed of g-C 3 N 4  nanosheets and chitosan solid film was fabricated by electrostatic interaction. The g-C 3 N 4  nanosheet/chitosan solid film showed selectivity and sensitivity to Cu 2+  which was higher than that of other metal ions in common use. Cu 2+  ions were found to efficiently bind and quench the fluorescence of the g-C 3 N 4  nanosheet/chitosan solid film. The absorption band of the g-C 3 N 4  nanosheet/chitosan solid film was at 240 nm in the presence of Cu 2+ , and the maximum emission peak was at 380 nm. Copper ion concentrations were between 0 and 3.1 × 10 −5  mol/L at pH 7, the detection limit is 5 nM, compared with previous reports, it was much lower than before. Good linear relationships existed between the metal ion concentration and fluorescence intensity of g-C 3 N 4  nanosheets in the quenching and recovering processes. This is the first study to report on the detection of Cu 2+  by utilizing g-C 3 N 4  nanosheet/chitosan composite film. The as-prepared films were conveniently prepared, easy to operate, and recyclable, as well as sensitive and selective to detect Cu 2+  in water. All these features indicate the sensor’s potential application in disease diagnosis.

Convenient and highly sensitive detection of Cu 2+ using chitosan solid film with g-C 3 N 4 nanosheets