Enhancing of Luminol-H2O2 Chemiluminescence System by Bimetallic Metal–Organic Frameworks with Mixed Ligands

Chemiluminescence (CL) is regarded as a better method for the detection of reactive oxygen species (ROS). However, the weak CL intensity prevents its further application. Many nanomaterials have been developed to enhance CL intensity, and mixed-ligand MOFs incorporating additional metals or organic ligands exhibit high efficiency in catalyzing. In this work, one kind of bimetallic mixed-ligand metal–organic framework (Ni-Co m-MOF) was synthesized using solvothermal methods. The material was morphologically characterized and demonstrated to be a dense and spherical flower-like structure. The addition of Ni-Co m-MOFs significantly enhanced the CL intensity of the luminol-H2O2 system by nearly 2,000-fold. The enhancement was found through further research as hydrogen peroxide was catalyzed to create hydroxyl radicals, etc., which reacted more easily with luminol. Herein, significant enhancement of the CL system by Ni-Co m-MOFs was identified, which provides ideas for improving the sensitivity and signal-to-noise ratio development of CL detectors.