A bionic palladium metal-organic framework based on a fluorescence sensing enhancement mechanism for sensitive detection of phorate

We have developed a biomimetic fluorescent nanoprobe (Pd-MOF) that can accurately identify phorate at a fixed wavelength for rapid, sensitive and selective detection. Pd-MOF was a nanoparticle (260.00 ± 27.83 nm) based on the linkage of Pd metal and a TCPP organic framework. It could detect phorate according to the fluorescence principles similar to that of the bioluminescence of (substance interaction and chromophore fluorescence enhancement). When phorate molecules enter the pores of Pd-MOF and interact with each other, the energy transfer process is stimulated, and the fluorescence signal is significantly enhanced, thereby improving the detection sensitivity. According to shift of the white line in the XANES energy spectrum and the DFT results, phorate increased the energy gap of Pd-MOF from 0.025 eV to 0.046 eV, enhanced the stability of the system, and thus achieved fluorescence enhancement. The sensitivity of Pd-MOF was due to its much smaller energy gap (