Abstract
This chapter presents recent progress on the determination of metal ions in aqueous solution using not only fluorescent graphene quantum dots (GQDs) but also heteroatom-doped GQDs and surface-functionalized GQDs. The analytic performances of the methods using different types of GQDs are critically discussed. In addition, some limitations including sensitivity, selectivity, and variety of the metal ions detected are also discussed. Finally, future research work searching for highly fluorescent GQDs as probes for the sensitive and selective determination of metal ions (e.g., Cu2+, Hg2+, and Fe3+) is recommended.
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