Sensor arrays have been widely used in the identification of metal ions (MIs), whereas traditional sensor arrays often rely on multiple independent sensing elements, which requires higher cost, complicated synthesis, and time-consuming. Herein, we designed a nanozyme sensor array based on a single element with three colorimetric channels for the discrimination of seven MIs (Pb 2+ , Fe 3+ , Zr 4+ , Mg 2+ , Cr 3+ , Ag + , and Hg 2+ ) in environments. Wherein, the Pt/HCNs nanozyme was prepared by integrating hollow carbon nanospheres (HCNs) with p...
