A “turn-on” fluorescence sensor for Pb2+ detection based on graphene quantum dots and gold nanoparticles

Abstract Heavy metal, such as Pb 2+ , detection technologies are quite important in environment monitoring and human health protection. However, most existing technologies are often time consuming, expensive with sophisticated equipment, and requirement of complicated sample pre-treatment, which limit the useful range of real-time application. Here, we report the development of a “turn-on” fluorescence sensor for Pb 2+ detection based on graphene quantum dots and gold nanoparticles. We achieved an extremely broad detection range of Pb 2+ from 50 nM to 4 μM, with a detection limit of 16.7 nM. This sensing system is highly sensitive and selective for determination of Pb 2+ . The proposed strategy is expected to provide considerable implication for other heavy metal, antigen, or DNAs by modifying sensing molecules, and fast examination in chemical and biological applications.

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