Surface pressure-area (π-A) isotherm characteristics of 5,10,15-(4-hydroxyphenyl)-20-(4-hexadecyloxyphenyl) porphyrin monolayers on both the water and TiO2 hydrosol subphases, the UV-vis absorption and fluorescence spectra of the monolayers deposited onto CaF2 substrates are investigated. π-A isotherms find that the porphyrin ring extends to lie more flat on a TiO2 hydrosol surface than on a water surface. The UV-vis absorption spectra of the deposited monolayers prove that the porphyrin TiO2 nanoparticle heterostructure assembly is formed, in which the J-aggregated effect of porphyrin is weakened, comparing with that in the monolayer deposited from water subphase. The fluorescence spectra show that the fluorescent emission quenching by the photoinduced electron transfer from the excited porphyrin molecule to TiO2 nanoparticle, occurs under excitation in the Soret band region of porphyrin.
|Original language||English (US)|
|Number of pages||4|
|State||Published - Jan 1 1998|
|Event||Proceedings of the 7th International Conference on Molecular Electronics and Biocomputing - Nanjing, China|
Duration: Nov 10 1997 → Nov 12 1997