A graphene oxide-photosensitizer complex as an enzyme-activatable theranostic agent.

The development of a target-activatable "smart" platform with high-affinity and specificity is of great importance for a wide range of biomedical applications. Here, we attempted to develop a new enzyme-activatable graphene oxide-photosensitizer complex as a biologically tunable theranostic agent, making it promising for near-infrared (NIR) fluorescence imaging and photo-induced cancer therapy.