A 'turn-on' fluorescence sensor for Pb~(2+) detection based on graphene quantum dots and gold nanoparticles

摘要

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 Pb2*. 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.