Abstract
Graphene quantum dots (GQDs) have generated enormous excitement because of their superiority in facile preparation, good biocompatibility, and excellent optical properties. Besides their unique luminescence emission comparable to carbon dots (CDs) and other quantum dots (QDs), GQDs consist of a single atomic layer of nanosized graphite and demonstrate similar surface structure and crystal configuration to graphene favorable for their wide applications. This chapter summarizes recent progress on the strategies for preparation and structure tuning of GQDs, then discusses the main sensing mechanisms, and finally highlights new insights into their optical applications in chemosensing, biosensing, and bioimaging. Meanwhile, the challenges and future potential developments on GQDs are discussed and speculated.
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