Photoinduced electron transfer from benzimidazole to nano WO_3, CuO and Fe_2O_3. A new approach on LUMO-CB energy-binding efficiency relationship

摘要

The dynamics of photoinduced electron injection from 2-(4-fluorophenyl)-1-phenyl-1H-benzimidazole (FPPBI) to CuO, Fe_2O_3 and WO_3 nanocrystals has been studied by FT-IR, absorption, fluorescence and lifetime spectroscopic methods. The association between nanoparticles and FPPBI is explained from both absorption and fluorescence quenching data. The distance between FPPBI and nanoparticles as well as the critical energy transfer distance has been obtained. The free energy change (△G_(et)) for electron injection has also been deduced. Energy gap between LUMO and CB is correlated with the binding efficiency of the FPPBI with nanoparticles. The electron transfer between the FPPBI with nanosemiconductors is explained in detail.