Facile and elaborate construction of MoS2 QDs@ZIF-8 as asynchronous response fluorescence sensor for naked-eye detection of tetracycline

Excessive use of tetracycline poses risks to human health and the ecological balance, which poses challenges to develop a method for facile and reliable detection of tetracycline. Herein, the MoS 2 QDs@ZIF-8 was prepared through a simple method, serving as an asynchronous response sensor for the naked-eye detection of tetracycline. The photoinduced electron transfer between the composite sensor and target tetracycline led to quench the blue fluorescence emitted by MoS 2 QDs. Hydrogen bond, chelation, π-π stacking and pore effect between the composite sensor and tetracycline made the aggregation of tetracycline, significantly enhancing the intrinsic yellow fluorescence of tetracycline. Moreover, it also exhibited good detection performance for the real samples such as river water, farm wastewater, honey and milk, demonstrating that it was suitable for naked-eye visualization detection in the field. This work provided a novel approach for constructing ratiometric fluorescence sensors with asynchronous response.