“On-Off-On” fluorescence sensor based on g-C3N4 nanosheets for selective and sequential detection of Ag+ and S2-

In this study, a novel, simple, and rapid sensor based on graphitic carbon nitride (g-C3N4) nanosheets was designed. the proposed sensor showed several advantages, including low cost, easy preparation, rapid detection, good biocompatibility, and a switchable fluorescence response.164