Novel nitrogen co-doped carbon dots (NCDs) were synthesized as a fluorescent “on–off–on” switch for the highly sensitive and selective sensing of Cu2+ and glutathione (GSH) by a straightforward pyrolysis route.
A ratiometric fluorescent N,S co-doped carbon dots (N,S-CD) probe for ClO− has been facilely obtained via a one-step hydrothermal method.