Fabrication of highly fluorescent graphene quantum dots for quantification of As3+ ion using modified cellulose paper

Abstract

AbstractEasy, economical, and swift detecting tools are very demanded for assaying various chemical species. The introduction of label‐free paper‐based read‐out devices has significantly reached the demand of analytical science for target analytes assays. Herein, a facile, and disposable inexpensive paper‐based sensing tool was fabricated for sensing As3+ ion using graphene quantum dots (GQDs) as a fluorescent reader. The CA‐GQDs were synthesized using citric acid (CA) as a precursor via the pyrolysis method, further physisorbed on the cellulose substrate for sensing of As3+ via aggregation‐based fluorescence “turn‐off” mechanism. The linear range for quantitating As3+ ion is in the range of 0.05–50 μM with a detection limit of 10 nM. The practical application of the CA‐GQDs‐based analytical platform was verified by assaying As3+ ion in water samples. The CA‐GQDs‐embedded paper strip can be easily extended for assaying of As3+ ion, which meets the demand for monitoring of As3+ ion in real samples.