| Autor: |
W.Q. Xu, S.R. Du, Yongmei Chen, Yubai Bai, M. Xian, Y. Wu, Tiejin Li, D.F. Shen, J.H. Yang, Yue Wang, Ran Lu |
| Rok vydání: |
1998 |
| Předmět: |
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| Zdroj: |
Supramolecular Science. 5:599-602 |
| ISSN: |
0968-5677 |
| DOI: |
10.1016/s0968-5677(98)00083-2 |
| Popis: |
Surface pressure–area ( π –A) isotherm characteristics of 5,10,15-(4-hydroxyphenyl)-20-(4-hexadecyloxyphenyl) porphyrin monolayers on both the water and TiO 2 hydrosol subphases, the UV–vis absorption and fluorescence spectra of the monolayers deposited onto CaF 2 substrates are investigated. π –A isotherms find that the porphyrin ring extends to lie more flat on a TiO 2 hydrosol surface than on a water surface. The UV–vis absorption spectra of the deposited monolayers prove that the porphyrin TiO 2 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 TiO 2 nanoparticle, occurs under excitation in the Soret band region of porphyrin. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect