Self-assembly and optical properties of nano-porphyrin

The 5-(4-sulfonatophenyl)-10, 15, 20-trisphenylporphyrin (TPPS1) molecule was aggregated to be nano-material in the water/ethanol mixed solution by self assembly approach. The structure and optical properties of the nano-TPPS1were characterized by atomic force microscopy (AFM), scanning electron microscopy (SEM), field emission scanning electron microscopy (FE-SEM) and fluorescence and UV-visible spectrometer. And the effects of treatment conditions in the process on the properties of the nano-material were studied. The results show that the nano-TPPS1with different size could be obtained and the average diameter distribution of nano-particles is between 50-70 nm. Comparing the UV and fluorescence emission spectras of the monomer with that of the nano-TPPS1, it is shown that the Soret band at 412 nm of monomer was split into a blue-shifted band at 361 nm and a red-shifted band at 451 nm respectively in the UV spectra. And fluorescence intensity and fluorescence quantum yield of nano-TPPS1are about 4 and 3 times of TPPS1monomer respectively in the fluorescence emission spectra. These results should be significant for nano-porphyrin application in marking, analysis, detection and the functional sensing material and device.