Fluorescence Studies on Benzene and Benzene Aqueous Solution in Mesoporous Silica

摘要

We have measured fluorescence spectra as well as fluorescence decay curves of highly ordered mesoporous silica,SBA-15 and FSM-16 including benzene or benzene aqueous solution as a function of temperature.An efficient energy transfer from benzene excited singlet state to a defect in the wall of mesoporous silica emitted at about 300 nm was found.On the basis of the decay analysis,it was suggested strongly that many of the benzene molecules exist in the proximity to the surface of pore wall owing to the strong molecular interactions between benzene and silica wall.It is noted that the defects in the silica wall seem to play an important role in understanding of the luminescence characteristics of chromophores embedded in mesopores.